Instructor Solutions Manual (Page 1 of 443)
INSTRUCTOR
SOLUTIONS
MANUAL
to accompany
An Introduction to Programming
Using Visual Basic, 10th Edition
by David I. Schneider
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 2 of 443)
Copyright © 2017 by Pearson Higher Education. All rights reserved.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 3 of 443)
CONTENTS
Chapter 2 Visual Basic Controls and Events
Exercises 2.2 Visual Basic Controls 5
Exercises 2.3 Visual Basic Events 11
Chapter 3 Variables, Input, and Output
Exercises 3.1 Numbers 16
Exercises 3.2 Strings 21
Exercises 3.3 Input and Output 29
Programming Projects 36
Chapter 4 Decisions
Exercises 4.1 Relational and Logical Operators 40
Exercises 4.2 If Blocks 41
Exercises 4.3 Select Case Blocks 56
Exercises 4.4 Input via User Selection 65
Programming Projects 79
Chapter 5 General Procedures
Exercises 5.1 Function Procedures 87
Exercises 5.2 Sub Procedures, Part I 96
Exercises 5.3 Sub Procedures, Part II 103
Programming Projects 109
Chapter 6 Repetition
Exercises 6.1 Do Loops 119
Exercises 6.2 For…Next Loops 127
Exercises 6.3 List Boxes and Loops 141
Programming Projects 155
Chapter 7 Arrays
Exercises 7.1 Creating and Using Arrays 165
Exercises 7.2 Using LINQ with Arrays 179
Exercises 7.3 Arrays of Structures 190
Exercises 7.4 Two-Dimensional Arrays 214
Programming Projects 226
Chapter 8 Text Files
Exercises 8.1 Managing Text Files 246
Exercises 8.2 StreamReaders, StreamWriters, Structured Exception Handling 255
Exercises 8.3 XML 266
Programming Projects 274
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 4 of 443)
Chapter 9 Additional Controls and Objects
Exercises 9.1 List Boxes and Combo Boxes 284
Exercises 9.2 Eight Additional Controls and Objects 290
Exercises 9.3 Multiple-Form Programs 300
Exercises 9.4 Graphics 317
Programming Projects 333
Chapter 10 Databases
Exercises 10.1 An Introduction to Databases 351
Exercises 10.2 Editing and Designing Databases 373
Programming Projects 376
Chapter 11 Object-Oriented Programming
Exercises 11.1 Classes and Objects 378
Exercises 11.2 Working with Objects 391
Exercises 11.3 Inheritance 416
Programming Projects 431
Some Common Commands 443
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Instructor Solutions Manual (Page 5 of 443)
CHAPTER 2
EXERCISES 2.2
1. While the mouse cursor is still hovering over the button that was just clicked, the button has a
pale blue color. After the cursor leaves the button, the button has a dark blue border.
2. Tabbing to another control, clicking on another control, or pressing Alt plus the access key
for another control.
3. Click on the form to make it the selected object.
Click on the Properties window or Press F4 to activate the Properties window.
Select the Text property.
Type "CHECKING ACCOUNT" and press the Enter key.
4. Double-click the TextBox icon in the Toolbox.
Activate the Properties window, and select the ForeColor property.
Click on the down-arrow button to the right of the Settings box.
Click on the Custom tab.
Click on the desired blue in the palette.
Move around the Properties window with the up- and down-arrow keys until the Text
property is selected.
Click on the Settings box and then type "PLAY IT, SAM" (without the quotes).
Click on the text box and then widen it slightly to see the words.
5. Double-click the TextBox icon in the Toolbox.
Activate the Properties window.
Select the BackColor property.
Click on the down-arrow to the right of the Settings box.
Click on the Custom tab, and then click on the desired yellow in the palette.
Click on the form to see the yellow text box.
6. Double-click on the TextBox icon in the Toolbox.
Activate the Properties window, and select the Name property.
Type "txtGreeting". (The name will appear in the Settings box.)
Select the Text property.
Type the requested word, "HELLO".
Select the Font property.
Click on the ellipsis to the right of the Settings box.
Click on the Size box.
To increase the size of the word, either type the number for the font size (such as "14") or
click on a number in the list below the current size.
Click on Italic in the "Font style" list.
Click OK.
If necessary, widen the text box.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 6 of 443)
7. Double-click on the Label icon in the Toolbox.
Activate the Properties window, and select the AutoSize property.
Set the AutoSize property to False.
Select the Text property and type the requested sentence.
Select the TextAlign property.
Click on the down-arrow button to the right of the Settings box, and click on one of the
center rectangles.
Resize the label so that the sentence occupies three lines.
8. Double-click on the TextBox icon in the Toolbox.
Activate the Properties window, and select the Text property.
Type "Visual Basic" and then press the Enter key.
If the text isn't all visible, drag the text box's right sizing handle to the right until all the text
can be seen.
Select the ReadOnly property.
Double-click on the ReadOnly property to change it's setting to True. (Or, go to the Settings
box, press the down-arrow button, and click on True.)
Select the Font property.
Click on the ellipsis to the right of the Settings box.
In the Font style box, click on Bold.
Click on the OK button.
Select the BackColor property and click on the down-arrow button.
Click on the Custom tab.
Click on the desired red in the palette.
Select the ForeColor property and click on the down-arrow button.
Click on the Custom tab.
Click on the white square in the upper-left corner of the palette.
9. Double-click on the TextBox icon in the Toolbox.
Activate the Properties window.
Set the Name property to txtLanguage.
Select the Text property and type "Visual Basic 2015".
Select the Font property and click on the ellipsis to the right of the Settings box.
Scroll up the Font box, and click on Courier New in the Font box.
Click on the OK button.
Widen the text box to accommodate its text.
10. Double-click on the Button icon in the Toolbox.
Activate the Properties window, and select the Text property.
Type "PUSH".
Select the BackColor property and click on the down-arrow button.
Click on the Custom tab.
Click on the yellow square (the third square in the fourth column) in the palette.
Double-click on the setting for the (Name) property, type in "btnPush", and press the Enter
key.
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Instructor Solutions Manual (Page 7 of 443)
11. Double-click on the Button icon in the Toolbox.
Activate the Properties window, and select the BackColor property.
Click on the down-arrow button to the right of the Settings box.
Click on the Custom tab, and then click on the white square in upper-left corner of the
palette.
Select the Text property and type "PUSH".
Select the Font property, and click on the ellipsis.
Click on Oblique in the "Font style" list.
Click on 24 in the Size list.
Click on the OK button.
Resize the button.
12. Double-click on the Button icon in the Toolbox.
Activate the Properties window, and select the Text property.
Type "&PUSH".
Select the Font property and click on the ellipsis.
Click on Bold in the "Font Style" box.
Click OK.
Click on the form to see the resulting button.
13. Double-click on the Button icon in the Toolbox.
Activate the Properties window.
Select the Text property and type "PUS&H".
Click on the form to see the resulting button.
14. Double-click on the Label icon in the Toolbox.
Activate the Properties window, and select the Text property.
Type "ALIAS".
Select the ForeColor property and click on the down-arrow button.
Click on the Custom tab.
Click on the desired white in the palette.
Select the BackColor property and click on the down-arrow button.
Click on the Custom tab.
Click on the desired shade of blue in the palette.
Click on the form to see the resulting label.
15. Double-click on the Label icon in the Toolbox.
Activate the Properties window.
Select the Name property and type "lblAKA".
Select the Text property and type "ALIAS".
Select the AutoSize property and set it to False.
Select the Font property and click on the ellipsis.
Click on Oblique in the "Font style" list.
Click on the OK button.
Select the TextAlign property, click on the down-arrow box to the right of the Settings box,
and click on one of the center rectangles.
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Instructor Solutions Manual (Page 8 of 443)
16. Click on the form to make it the selected object.
Activate the Properties window, and select the Text property.
Type "BALANCE SHEET".
Select the BackColor property and click on the down-arrow button.
Click on the Custom tab.
Click on the desired shade of yellow in the palette.
17. Double-click on the Label icon in the Toolbox.
Activate the Properties window, and select the TextAlign property.
Click on the down-arrow box to the right of the Settings box, and click on one of the
rectangles on the right.
Select the AutoSize property and set it to False.
Select the Text property, type "VISUAL BASIC", and press Enter.
If the words " VISUAL BASIC " are on one line, resize the label until the words occupy two
lines.
18. In the Solution Explorer, right-click on the file Form1.vb.
Select “Rename” from the drop-down list.
Change the filename from Form1.vb to frmHello.vb.
In the Properties window, change the setting of the Text property from Form1 to Hello
World.
19. Double-click on the Label icon in the Toolbox.
Activate the Properties window and set the Text property of the label to PROGRAM.
Select the Font property, and click on the ellipsis to the right of its Settings box.
Click on Oblique in the "Font style" list, and click on the Underline box.
Click on the OK button.
20. Double-click on the Label icon in the Toolbox.
Activate the Properties window, and select the Text property.
Type "ALIAS".
Select the Font property and click on the ellipsis.
Click on Bold in the Font style box.
Click on Courier New in the Font box and press OK.
Click on the form to see the resulting label.
21. Double-click on the ListBox icon in the Toolbox.
Activate the Properties window, and select the BackColor property.
Click on the down-arrow button to the right of the Settings box.
Click on the Custom tab and click on the desired yellow square in the palette.
Click on the form.
22. Double-click on the ListBox icon in the Toolbox.
Activate the Properties window, and select the Visible property.
Double-click on the Visible property to change it's setting to False. (Or, go to the Settings
box, press the down-arrow button, and click on False.)
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Instructor Solutions Manual (Page 9 of 443)
23. In the Solution Explorer window, right click on “Form1.vb” and select Rename from the
context menu that appears.
Change Form1.vb to frmYellow.vb, and click the No button in the box that appears.
Right-click on the form in the Form Designer, and click on Properties in the context menu.
Click on BackColor property in the Properties window.
Click on the down-arrow button in the right part of the Settings box, click on the Custom tab,
and click on a yellow square.
24. Double-click on the Button icon in the Toolbox.
Activate the Properties window and set the Text property of the button to BUTTON.
Select the Font property, and click on the ellipsis to the right of its Settings box.
Click on Bold in the "Font style" list.
Place a check mark in the small square to the left of the word "Underline" by clicking on the
square.
Click on the OK button.
25. Begin a new program.
Change the text in the form's title bar to "Dynamic Duo".
Place two buttons on the form.
Position and resize the buttons as shown.
Enter “Batman” as the text of the first button, and enter “Robin” as the text of the second
button.
Increase the font size for both buttons to 14.
26. Begin a new program.
Change the text in the form's title bar to "Enter Names".
Place on the form a label, a text box, and a button in the sizes and locations shown. Change
the text on the label to "Name".
Change the text on the button to "Enter".
Increase the Font size for the label and the button to 12.
27. Begin a new program.
Change the text in the form's title bar to "Fill in the Blank".
Place a label, a text box, and another label on the form at appropriate locations.
Change the Text setting of the first label to "I’m the king of the" and the Text setting of the
second label to "A Quote by Leonardo DiCaprio".
28. Begin a new program.
Change the text in the form's title bar to "Similarity".
Place a big label and a normal-sized label on the form.
Move the small label to the bottom of the form, and move and resize the big label so that it
covers most of the top of the form.
Select the normal-sized label.
Change the setting of the Text property to "A Quote".
Select the big label.
Change the setting of the Text property to the specified sentence.
Increase the font size to 12.
Resize and position the labels as needed.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 10 of 443)
29. Begin a new program.
Change the text in the form's title bar to "Uncle's Advice".
Place five labels and three buttons on the form at appropriate locations.
Change the Text setting of each label as indicated.
Change the settings of the buttons' Text properties to "1", "2", and "3".
Resize and position the labels and buttons.
30. Begin a new program.
Change the text in the form's title bar "3 Rectangles".
Place a label on the form and increase its size to provide plenty of space.
Change the background color to red.
Place a smaller label inside the red label.
Change its background color to some shade of white.
Finally, place a yet smaller label inside the white box.
Change its background color to blue.
Resize and position the labels as needed.
33. 1
34. 0
35. Each arrow key moves the text box in the indicated direction.
36. Pressing the right- and left-arrow keys widen and narrow the text box. The up- and downarrow keys have no effect.
37. Pressing the right- and left-arrow keys widens and narrows the text boxes, buttons, and list
boxes in the group of selected controls. The up- and down-arrow keys shorten and lengthen
the buttons and list boxes in the group. The arrow keys have no effect on the labels, and only
the left- and right-arrow keys affect the text boxes.
38. Each arrow key moves every control in the group in the indicated direction.
39. Drag a label and a list box onto the form.
Click on the label.
Hold down the Ctrl key and click on the list box. (You have now selected a group of two
controls.)
In the Properties window, click on the symbol to the left of the Font property.
Click on the Size property, change the setting to 12, and press the Enter key.
(Alternative: Replace the last two lines with the following steps.)
In the Properties window, select the Font property.
Click on the ellipsis button to the right of the Settings box.
Click on 12 in the Size list and click on the OK button.
40. The button moves to a comfortable distance from one of the sides of the form.
41. The label is positioned just to the left of the text box, and the middles of the two controls are
aligned.
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Instructor Solutions Manual (Page 11 of 443)
42. The left sides of the buttons are aligned and the two buttons are a comfortable distance apart.
43. Center refers to the midpoint horizontally, whereas middle refers to the midpoint vertically.
44. Select the four buttons as a group. Click on the Format menu, click on Make Same Size, and
then click on Both. Click on the Format menu again, click on Vertical Spacing, and then
click on Make Equal.
45. First blue snap line: tops of the two controls are aligned
Purple snap line: texts of the two controls are aligned
Second blue snap line: bottoms of the two controls are aligned
46. The setting toggles between True and False.
47. The setting is cycling through the different available colors.
EXERCISES 2.3
1. The word Hello
2. The word Hello in red letters
3. The word Hello on an orange-colored background
4. The word Hello
5. The text box vanishes.
6. The word Hello on a yellow background
7. The word Hello in green letters
8. The word Hello on a white background
9. The word Hello on a gold background.
10. Nothing, the label cannot be seen.
11. Form1.Text should be Me.Text.
12. The word Hello must be surrounded with quotation marks.
13. Red should be replaced with Color.Red.
14. Replace txtBox with txtBox.Text.
15. Font.Size is a read-only property. The statement txtOutput.Text = txtBox.Font.Size is
valid since it is reading the value of txtBox.Font.Size. However, txtBox.Font.Size = 20 is
not valid since it is setting the value of txtBox.Font.Size.
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Instructor Solutions Manual (Page 12 of 443)
16. Me.Color must be replaced by Me.ForeColor or Me.BackColor
17. lblTwo.Text = "E.T. phone home."
18. lblTwo.Text = "Play it, Sam."
lblTwo.ForeColor = Color.Red
19. txtBox.ForeColor = Color.Red
txtBox.Text = "The stuff that dreams are made of."
20. txtBox.ForeColor = Color.Blue
txtBox.BackColor = Color.Gold
txtBox.Text = "Life is like a box of chocolates."
21. txtBox.Enabled = False
22. Me.Text = "Hello World"
23. lblTwo.Visible = False
24. lblName.ForeColor = Color.Red
25. btnOutcome.Enabled = True
26. btnCompute.Focus()
27. txtBoxTwo.Focus()
28. Me.BackColor = Color.White
29. The Enter event occurs when a control gets the focus.
30. A control's Leave event occurs when the control loses the focus.
31. Private Sub Label1_Click(...) Handles Label1.Click
lstOutput.Items.Add("Click")
End Sub
Private Sub Label1_DoubleClick(...) Handles Label1.DoubleClick
lstOutput.Items.Add("Double Click")
End Sub
Whenever the DoubleClick event is raised, the Click event is also raised.
32. Private Sub Button1_Click(...) Handles Button1.Click
lstOutput.Items.Add("Click")
End Sub
33. Private Sub btnLeft_Click(...) Handles btnLeft.Click
txtBox.Text = "Left Justify"
txtBox.TextAlign = HorizontalAlignment.Left
End Sub
Private Sub btnCenter_Click(...) Handles btnCenter.Click
txtBox.Text = "Center"
txtBox.TextAlign = HorizontalAlignment.Center
End Sub
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Instructor Solutions Manual (Page 13 of 443)
Private Sub btnRight_Click(...) Handles btnRight.Click
txtBox.Text = "Right Justify"
txtBox.TextAlign = HorizontalAlignment.Right
End Sub
34. Private Sub btnSmile_Click(...) Handles btnSmile.Click
lblFace.Text = ":-)"
End Sub
Private Sub btnFrown_Click(...) Handles btnFrown.Click
lblFace.Text = ":-("
End Sub
35. Private Sub btnRed_Click(...) Handles btnRed.Click
txtBox.BackColor = Color.Red
End Sub
Private Sub btnBlue_Click(...) Handles btnBlue.Click
txtBox.BackColor = Color.Blue
End Sub
Private Sub btnWhite_Click(...) Handles btnWhite.Click
txtBox.ForeColor = Color.White
End Sub
Private Sub btnYellow_Click(...) Handles btnYellow.Click
txtBox.ForeColor = Color.Yellow
End Sub
36. Private Sub txtOne_Enter(...) Handles txtOne.Enter
txtOne.ForeColor = Color.Red
txtTwo.ForeColor = Color.Black
txtThree.ForeColor = Color.Black
End Sub
Private Sub txtTwo_Enter(...) Handles txtTwo.Enter
txtOne.ForeColor = Color.Black
txtTwo.ForeColor = Color.Red
txtThree.ForeColor = Color.Black
End Sub
Private Sub txtThree_Enter(...) Handles txtThree.Enter
txtOne.ForeColor = Color.Black
txtTwo.ForeColor = Color.Black
txtThree.ForeColor = Color.Red
End Sub
Private Sub btnLeft_Click(...) Handles btnLeft.Click
txtOne.TextAlign = HorizontalAlignment.Left
txtTwo.TextAlign = HorizontalAlignment.Left
txtThree.TextAlign = HorizontalAlignment.Left
End Sub
Private Sub btnRight_Click(...) Handles btnRight.Click
txtOne.TextAlign = HorizontalAlignment.Right
txtTwo.TextAlign = HorizontalAlignment.Right
txtThree.TextAlign = HorizontalAlignment.Right
End Sub
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Instructor Solutions Manual (Page 14 of 443)
37. Private Sub txtLife_Enter(...) Handles txtLife.Enter
txtQuote.Text = "I like life, it's something to do."
End Sub
Private Sub txtFuture_Enter(...) Handles txtFuture.Enter
txtQuote.Text = "The future isn't what it used to be."
End Sub
Private Sub txtTruth_Enter(...) Handles txtTruth.Enter
txtQuote.Text = "Tell the truth and run."
End Sub
38. Private Sub btnDisable_Click(...) Handles btnDisable.Click
txtBox.Enabled = False
End Sub
Private Sub btnEnable_Click(...) Handles btnEnable.Click
txtBox.Enabled = True
txtBox.Focus()
End Sub
39. Private Sub btnOne_Click(...) Handles btnOne.Click
btnOne.Visible = False
btnTwo.Visible = True
btnThree.Visible = True
btnFour.Visible = True
End Sub
Private Sub btnTwo_Click(...) Handles btnTwo.Click
btnOne.Visible = True
btnTwo.Visible = False
btnThree.Visible = True
btnFour.Visible = True
End Sub
Private Sub btnThree_Click(...) Handles btnThree.Click
btnOne.Visible = True
btnTwo.Visible = True
btnThree.Visible = False
btnFour.Visible = True
End Sub
Private Sub btnFour_Click(...) Handles btnFour.Click
btnOne.Visible = True
btnTwo.Visible = True
btnThree.Visible = True
btnFour.Visible = False
End Sub
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Instructor Solutions Manual (Page 15 of 443)
40. Private Sub txtGreen_Enter(...) Handles txtGreen.Enter
txtGreen.BackColor = Color.Green
txtYellow.BackColor = Color.DarkGray
txtRed.BackColor = Color.DarkGray
End Sub
Private Sub txtYellow_Enter(...) Handles txtYellow.Enter
txtGreen.BackColor = Color.DarkGray
txtYellow.BackColor = Color.Yellow
txtRed.BackColor = Color.DarkGray
End Sub
Private Sub txtRed_Enter(...) Handles txtRed.Enter
txtGreen.BackColor = Color.DarkGray
txtYellow.BackColor = Color.DarkGray
txtRed.BackColor = Color.Red
End Sub
41. Private Sub btnVanish_Click(...) Handles btnVanish.Click
lblFace.Visible = False
End Sub
Private Sub btnReappear_Click(...) Handles btnReappear.Click
lblFace.Visible = True
End Sub
42. Private Sub txtName_Enter(...) Handles txtName.Enter
lblInstructions.Text = "Enter your full name."
End Sub
Private Sub txtPhone_Enter(...) Handles txtPhone.Enter
lblInstructions.Text = "Enter your phone number, including area code."
End Sub
43. Private Sub btnAny_Click(...) Handles btnOne.Click, btnTwo.Click
txtOutput.Text = "You just clicked on a button."
End Sub
44. Private Sub txtBox1_Click(...) Handles txtBox1.Click
txtBox2.Text = txtBox1.Text
txtBox1.Clear()
End Sub
Private Sub txtBox2_Click(...) Handles txtBox2.Click
txtBox1.Text = txtBox2.Text
txtBox2.Clear()
End Sub
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Instructor Solutions Manual (Page 16 of 443)
CHAPTER 3
EXERCISES 3.1
1. 12
2. 49
3. .125
4. 23
5. 8
6. –96
7. 2
8. 2
9. 1
10. 1
11. 3
12. 0
13. Not valid
14. Not valid
15. Valid
16. Not valid
17. Not valid
18. Not valid
19. 10
20. 14
21. 16
22. 16
23. 9
24. 8
25. Private Sub btnCompute_Click(...) Handles btnCompute.Click
lstOutput.Items.Add((7 * 8) + 5)
End Sub
26. Private Sub btnCompute_Click(...) Handles btnCompute.Click
lstOutput.Items.Add((1 + (2 * 9)) ^ 3)
End Sub
27. Private Sub btnCompute_Click(...) Handles btnCompute.Click
lstOutput.Items.Add(0.055 * 20)
End Sub
28. Private Sub btnCompute_Click(...) Handles btnCompute.Click
lstOutput.Items.Add(15 - 3 * (2 + (3 ^ 4)))
End Sub
29. Private Sub btnCompute_Click(...) Handles btnCompute.Click
lstOutput.Items.Add(17 * (3 + 162))
End Sub
30. Private Sub btnCompute_Click(...) Handles btnCompute.Click
lstOutput.Items.Add((4 + (1 / 2)) - (3 + (5 / 8)))
End Sub
31.
Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
Dim x, y As Double
x = 2
y = 3 * x
x = y + 5
lstResults.Items.Clear()
lstResults.Items.Add(x + 4)
y = y + 1
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
x
y
0
2
2
11
11
11
11
0
0
6
6
6
6
7
Instructor Solutions Manual (Page 17 of 443)
32.
Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
Dim bal, inter, withDr As Decimal
bal = 100
inter = 0.05D
withDr = 25
bal += inter * bal
bal = bal – withDr
End Sub
33. 6
34. 24
35. 1
8
9
36. 10
37. 1
64
38. 225
bal
inter
withDr
0
100
100
100
105
80
0
0
0.05
0.05
0.05
0.05
0
0
0
25
25
25
39. 2
15
40. 5
10
41. The third line should read c = a + b
42. The third assignment statement does not work. In the last statement, there needs to be an
asterisk after the 5. Also, the last statement needs two extra closing parenthesis at the end.
43. The first assignment statement should not contain a comma. The second assignment
statement should not contain a dollar sign.
44. The first assignment statement should read interest = 0.05D
45. 9W is not a valid variable name.
46. Round should be changed to Math.Round
47. Dim quantity As Integer = 12
48. Dim m As Integer = 2, n As Double = 3
49. 10
50. 7
51. 6
52. 8
53. 3.128
54. -3
55. –3
56. 2
57. 0
58. 3
59. 6
60. 1
61. cost += 5
62. sum *= 2
63. cost /= 6
64. sum -= 7
65. sum ^= 2
66. sum += 3
67. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim revenue, costs, profit As Decimal
revenue = 98456
costs = 45000
profit = revenue - costs
lstOutput.Items.Add(profit)
End Sub
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Instructor Solutions Manual (Page 18 of 443)
68. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim costPerShare, numberOfShares, amount As Decimal
costPerShare = 25.625D
numberOfShares = 400
amount = costPerShare * numberOfShares
lstOutput.Items.Add(amount)
End Sub
69. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim price, discountPercent, markdown As Decimal
price = 19.95D
discountPercent = 30
markdown = (discountPercent / 100) * price
price = price - markdown
lstOutput.Items.Add(Math.Round(price, 2))
End Sub
70. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim fixedCosts, pricePerUnit, costPerUnit, breakEvenPoint As Decimal
fixedCosts = 5000
pricePerUnit = 8
costPerUnit = 6
breakEvenPoint = fixedCosts / (pricePerUnit - costPerUnit)
lstOutput.Items.Add(breakEvenPoint)
End Sub
71. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim balance As Decimal
balance = 100
balance += 0.05D * balance
balance += 0.05D * balance
balance += 0.05D * balance
lstOutput.Items.Add(Math.Round(balance, 2))
End Sub
72. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim balance As Decimal
balance = 100
balance += 0.05D * balance + 100
balance += 0.05D * balance + 100
balance += 0.05D * balance
lstOutput.Items.Add(Math.Round(balance, 2))
End Sub
73. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim purchasePrice As Decimal = 215.50D
Dim sellingPrice As Decimal = 644.99D
Dim markup As Decimal = sellingPrice - purchasePrice
Dim percentageMarkup As Decimal = 100 * (markup / purchasePrice)
lstOutput.Items.Add(percentageMarkup)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 19 of 443)
74. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim purchasePrice As Decimal = 215.50D
Dim sellingPrice As Decimal = 429.99D
Dim markup As Decimal = sellingPrice - purchasePrice
Dim profitMargin As Decimal = 100 * (markup / sellingPrice)
lstOutput.Items.Add(profitMargin)
End Sub
75. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim acres, yieldPerAcre, corn As Double
acres = 30
yieldPerAcre = 18
corn = yieldPerAcre * acres
lstOutput.Items.Add(corn)
End Sub
76. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim initialVelocity, initialHeight, height, t As Double
initialVelocity = 50
initialHeight = 5
t = 3
height = (-16 * t ^ 2) + (initialVelocity * t) + initialHeight
lstOutput.Items.Add(height)
End Sub
77. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim distance, elapsedTime, averageSpeed As Double
distance = 233
elapsedTime = 7 - 2
averageSpeed = distance / elapsedTime
lstOutput.Items.Add(averageSpeed)
End Sub
78. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim miles, gallonsUsed, milesPerGallon As Double
miles = 23695 - 23352
gallonsUsed = 14
milesPerGallon = miles / gallonsUsed
lstOutput.Items.Add(milesPerGallon)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 20 of 443)
79. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim waterPerPersonPerDay, people, days, waterUsed As Double
waterPerPersonPerDay = 1600
people = 315000000
days = 365
waterUsed = waterPerPersonPerDay * people * days
lstOutput.Items.Add(waterUsed)
End Sub
80. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim numPerDay As Integer
numPerDay = 350 * 60 * 60 * 24
lstOutput.Items.Add(numPerDay)
End Sub
81. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim pizzarias, percent, restaurants As Double
pizzarias = 70000
percent = 0.12
restaurants = pizzarias / percent
lstOutput.Items.Add(Math.Round(restaurants))
End Sub
82. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim pop2000, pop2050, percentGrowth As Double
pop2000 = 281
pop2050 = 404
percentGrowth = Math.Round(100 * ((pop2050 - pop2000) / pop2000))
lstOutput.Items.Add((percentGrowth))
End Sub
83. Private Sub btnConvert_Click(...) Handles btnConvert.Click
Dim conversionFactor As Double = 0.6214
Dim kilometersPerHr, milesPerHr As Double
kilometersPerHr = CDbl(txtSpeedKil.Text)
milesPerHr = conversionFactor * kilometersPerHr
txtSpeedMph.Text = milesPerHr.ToString("N")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 21 of 443)
84. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
lstValue.Items.Add(4 * 20 + 7)
End Sub
85. Private Sub btnEstimate_Click(...) Handles btnEstimate.Click
Dim cal As Double
cal = (5280 ^ 3) * 48600
lstCalories.Items.Add(cal)
End Sub
86. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim debt As Double = 16.8 * 10 ^ 12
Dim pop As Double = 315 * 10 ^ 6
lstDebt.Items.Add(CInt(debt / pop))
End Sub
EXERCISES 3.2
1. Visual Basic
2. Hello
3. Ernie
4. Bert
5. flute
6. acute
7. 123
8. 8
9. Your age is 21.
10. Fred has 2 children.
11. A ROSE IS A ROSE IS A ROSE
12. 76 trombones
13. 5.5
14. 3
15. goodbye
17. WALLAWALLA
18. murmur
19. ABC
2
4
55 mph
STU
20. 8 ball
21. 12
22. 9
-1
MUNICIPALITY
microsoft
5
city
os
evolutionary
6
5
10
23. 8 (0 through 7)
24. 7
25. True
16. eighth
26. True
27. The variable phoneNumber should be declared as type String, not Double.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 22 of 443)
28. The sentence in the second line should be surrounded by quotation marks.
29. End is a keyword and cannot be used as a variable name.
30. txtBox should be changed to txtBox.Text.
31. The IndexOf method cannot be applied to a number, only a string.
32. A number does not have a Length property, only a String has a Length property.
33. 2 ^ 3 is a Double value and therefore cannot be assigned to the Decimal variable m. Also,
4 / 2 is a Double value and cannot be assigned to an Integer variable.
34. 3.45 is a Double value and therefore cannot be assigned to a Decimal variable. The second
line should be replaced with either m = 3.45D or m = CDec(3.45).
35. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim firstName, middleName, lastName As String, yearOfBirth As Integer
firstName = "Thomas"
middleName = "Alva"
lastName = "Edison"
yearOfBirth = 1847
txtOutput.Text = firstName & " " & middleName & " " & lastName &
", " & yearOfBirth
End Sub
36. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim item As String, regularPrice, discount As Decimal
item = "ketchup"
regularPrice = 1.8D
discount = 0.27D
txtOutput.Text = (regularPrice - discount) & " is the sale price of " &
item & "."
End Sub
37. Dim str As String
'Place in the Declarations section of the program.
38. Dim str As String
'Place near the top of the event procedure.
39. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim distance As Double
distance = CDbl(txtNumSec.Text) / 5
distance = Math.Round(distance, 2)
txtOutput.Text = "The distance of the storm is " & distance & " miles."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 23 of 443)
40. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim thr, age, rhr As Double
age = CDbl(txtAge.Text)
rhr = CDbl(txtRestHR.Text)
thr = 0.7 * (220 - age) + 0.3 * rhr
thr = Math.Round(thr)
txtTrainHR.Text = "Your THR is " & thr & " beats per minute."
End Sub
41. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim cycling, running, swimming, pounds As Double
cycling = CDbl(txtCycle.Text)
running = CDbl(txtRun.Text)
swimming = CDbl(txtSwim.Text)
pounds = ((200 * cycling) + (475 * running) + (275 * swimming)) / 3500
pounds = Math.Round(pounds, 1)
txtWtLoss.Text = pounds & " pounds were lost."
End Sub
42. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim wattage, hours, price, costInCents, costInDollars As Double
wattage = CDbl(txtWattage.Text)
hours = CDbl(txtHoursUsed.Text)
price = CDbl(txtPricePerKWh.Text)
costInCents = (wattage * hours * price) / 1000
costInDollars = Math.Round(costInCents) / 100
txtCost.Text = CStr(costInDollars)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 24 of 443)
43. Private Sub btnAdd_Click(...) Handles btnAdd.Click
Dim hr1, hr2, min1, min2, totalMinutes, totalHours As Integer
hr1 = CInt(txtHours1.Text)
hr2 = CInt(txtHours2.Text)
min1 = CInt(txtMin1.Text)
min2 = CInt(txtMin2.Text)
totalMinutes = (min1 + min2) Mod 60
totalHours = hr1 + hr2 + ((min1 + min2) \ 60)
txtSum.Text = totalHours & " hours and " & totalMinutes & " minutes"
End Sub
44. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim numberOfGames As Integer
Dim percent, percentage As Double
numberOfGames = CInt(txtWon.Text) + CInt(txtLost.Text)
percent = CDbl(txtWon.Text) / numberOfGames
percentage = 100 * Math.Round(percent, 5)
txtPercent.Text = "The " & txtTeam.Text & " won " & percentage &
" percent of their games."
End Sub
45. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim revenue, expenses, income As Decimal
revenue = CDec(txtRevenue.Text)
expenses = CDec(txtExpenses.Text)
income = revenue - expenses
txtNetIncome.Text = CStr(income)
End Sub
46. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim per As Decimal
per = CDec(txtPrice.Text) / CDec(txtEarnings.Text)
txtPER.Text = CStr(per)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 25 of 443)
47. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim speed, distance As Double
distance = CDbl(txtDistanceSkidded.Text)
speed = Math.Sqrt(24 * distance)
speed = Math.Round(speed, 2)
txtEstimatedSpeed.Text = speed & " mph"
End Sub
48. Private Sub btnConvert_Click(...) Handles btnConvert.Click
Dim per As String, num As Double
per = txtPercent.Text
per = per.Substring(0, per.Length - 1)
num = CDbl(per) / 100
txtNumber.Text = CStr(num)
End Sub
49. Dim number As Integer = 100
'in Declarations section
Private Sub btnPressMe_Click(...) Handles btnPressMe.Click
number = number - 1 'decrease number by 1
txtOutput.Text = CStr(number)
End Sub
50. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim phoneNumber As String
phoneNumber = txtPhoneNumber.Text
txtAreaCode.Text = phoneNumber.Substring(0, 3)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 26 of 443)
51. Dim sum As Double
Dim num As Integer
'sum of the scores entered
'number of scores entered
Private Sub btnRecord_Click(...) Handles btnRecord.Click
num += 1
sum += CDbl(txtScore.Text)
txtScore.Clear()
txtScore.Focus()
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
txtAverage.Text = CStr(sum / num)
End Sub
52. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim sentence = "THE QUICK BROWN FOX JUMPS OVER A LAZY DOG"
Dim letter As String, position As Integer
letter = txtLetter.Text.ToUpper
position = sentence.IndexOf(letter)
txtOutput.Text = letter & " first occurs in position " & position & "."
End Sub
53. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim amount, percentage, tip As Decimal
amount = CDec(txtAmount.Text)
percentage = CDec(txtPercentage.Text)
tip = amount * (percentage / 100)
txtTip.Text = CStr(Math.Round(tip, 2))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 27 of 443)
54. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim number As String, position As Integer
number = txtNumber.Text
position = number.IndexOf(".")
txtLeft.Text = CStr(position)
txtRight.Text = CStr(number.Length - position - 1)
End Sub
55. Private Sub btnModifySentence_Click(...) Handles btnModifySentence.Click
Dim sentence, oldWord, newWord As String
Dim position As Integer
sentence = txtSentence.Text
oldWord = txtOriginalWord.Text
newWord = txtReplacementWord.Text
position = sentence.IndexOf(oldWord)
txtOutput.Text = sentence.Substring(0, position) & newWord &
sentence.Substring(position + oldWord.Length)
End Sub
56. Dim totalSales As Decimal
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
lstOutput.Items.Add(txtItem.Text & ": " & txtPrice.Text)
totalSales += CDec(txtPrice.Text)
txtItem.Clear()
txtPrice.Clear()
txtItem.Focus()
End Sub
Private Sub btnShow_Click(...) Handles btnShow.Click
lstOutput.Items.Add("Total commission = " & (0.06 * totalSales))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 28 of 443)
57. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim num1, num2, sum As Double
num1 = CDbl(txtFirstNum.Text)
num2 = CDbl(txtSecondNum.Text)
sum = num1 + num2
txtSum.Text = CStr(sum)
End Sub
Private Sub txtEitherNum_TextChanged(...) Handles _
txtFirstNum.TextChanged, txtSecondNum.TextChanged
txtSum.Clear()
End Sub
58. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim principal, interestRate, balance As Decimal
Dim numYears As Integer
principal = CDec(txtPrincipal.Text)
interestRate = CDec(txtInterest.Text)
numYears = CInt(txtYears.Text)
balance = CDec(principal * (1 + interestRate / 100) ^ numYears))
txtBalance.Text = balance.ToString("C")
End Sub
59. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim futureValue, interestRate, presentValue As Decimal
Dim numYears As Integer
futureValue = CDec(txtFutureValue.Text)
interestRate = CDec(txtInterest.Text)
numYears = CInt(txtYears.Text)
presentValue = CDec(futureValue / (1 + interestRate / 100) ^ numYears)
txtPresentValue.Text = CStr(Math.Round(presentValue, 2))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 29 of 443)
60. Private Sub btnConvert_Click(...) Handles btnConvert.Click
Dim numMonths As Integer = CInt(txtMonths.Text)
Dim years As Integer = numMonths \ 12
Dim remainingMonths = numMonths Mod 12
txtAnswer.Text = years.ToString("N0") & " years and " &
remainingMonths & " months"
End Sub
61. Private Sub btnConvert_Click(...) Handles btnConvert.Click
Dim feet, inches As Integer
inches = CInt(txtInches.Text)
feet = inches \ 12
inches = inches Mod 12
txtFeetAndInches.Text = feet & " feet and " & inches & " inches"
End Sub
62. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim taxBracket As Decimal = CDec(txtTaxBracket.Text)
Dim bondRate As Decimal = CDec(txtMunIntRate.Text)
Dim equivCDrate As Decimal = bondRate / (1 - taxBracket)
txtCDIntRate.Text = CStr(Math.Round(equivCDrate, 3))
End Sub
EXERCISES 3.3
1. 1,235
5. 0.0
2. –12.346
6. 0.1
3. 1,234.0
7. -0.67
4. 12,345.00
8. 1.20
9. 12,346.000
10. 12
11. 12
12. $1,234.50
13. $12,346
14. ($1,234,567.00)
15. ($0.23)
16. $3,200.00
17. $0.80
18. 4 %
19. $0.08
20. -5.000 %
21. 100.00 %
22. 1.00 %
23. 66.67 %
24. 75.0 %
25. Pay to France $27,267,622.00
26. Manhattan was purchased for $24.00
27. 25.6 % of the U.S. population 25+ years old are college graduates.
28. 1,711,500 degrees were conferred.
29. The likelihood of Heads is 50 %
30. Pi = 3.1416
31. 10/23/2015
32. Sunday, June 15, 2017
33. Thursday, November 24, 2016
34. 1/1/2015
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 30 of 443)
35. 10/2/2017
36. 2/9/2016
37. 4/5/2019
38. 11/2/2015
39. 29
40. 366
41. 5
42. 2
43. 1
44. 2016
45. 2018
46. 1, 2, 3
48. Untied
49. Hello John Jones
47. You might win 360 dollars.
50. At the current interest rate, money will double in 18 years.
51. $106.00
52. You owe $900,000.00 in estate taxes.
53. 123456789012345678901234567890
Mountain
Place
Ht (ft)
K2
Kashmir
28,250
54. 12345678901234567890
College
Mascot
Univ. of MD
Terrapins
Duke
Blue Devils
55. 12345678901234567890
Element Weight Percent
Oxygen 97.5
65.0 %
Carbon 27.0
18.0 %
56. 12345678901234567890
Tuition
College
& Fees
Stanford
$42,690
Harvard
$42,292
57. The statement n += 1 is not valid since the value of a named constant cannot be changed.
58. The statement n = n.ToUpper is not valid since the value of a constant cannot be changed.
59. The second line should use CDbl to convert the right-hand side to type Double.
60. There needs to be a string inside the InputBox() call (i.e., the "Prompt" argument is required).
61. (123456).ToString("N") is a string and therefore cannot be assigned to a numeric variable.
62. Must remove the dollar sign.
63. You must insert .Show after the word MessageBox.
64. 1776 should be surrounded with quote marks
65. 000
66. LLLLLLLLLL
67. LLL000
68. 0LLL000
69. 0-00-000000-&
70. LL
71. MessageBox.Show("First solve the problem. Then write the code.",
"Good Advice")
72. MessageBox.Show("You can't steal second base and keep one foot on first.",
"Taking Risks Proverb")
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Instructor Solutions Manual (Page 31 of 443)
73. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Inflation
Dim begOfYearCost, endOfYearCost As Decimal
Dim percentIncrease As Decimal
begOfYearCost = 200
endOfYearCost = CDec(InputBox("Enter cost at the end of the year:"))
percentIncrease = (endOfYearCost - begOfYearCost) / begOfYearCost
txtOutput.Text = "The increase in cost for the year is " &
percentIncrease.ToString("P") & "."
End Sub
74. Private Sub btnDisplayReport_Click(..) Handles btnDisplayReport.Click
'Report the amount of money raised in a walk-a-thon
Dim pledge, miles As Decimal
pledge = CDec(InputBox("Enter amount pledged per mile:", "Walk-A-Thon"))
miles = CDec (InputBox("Enter number of miles walked:", "Walk-A-Thon"))
txtReport.Text = "Collect " & (pledge * miles).ToString("C") &
" from this sponsor."
End Sub
75. Private Sub txtPhoneNumber_Enter(...) Handles txtPhoneNumber.Enter
'Reminder
MessageBox.Show("Be sure to include the area code!", "Reminder")
End Sub
76. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Days since Declaration of Independence ratified
Dim dateDOC As Date = #7/4/1776#
Dim numDays As Double = DateDiff(DateInterval.Day, dateDOC, Today)
txtNumDays.Text = numDays.ToString("N0")
End Sub
77. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Length of year
Dim firstDayOfYr, firstDayOfNextYr As Date
Dim numDays As Double
firstDayOfYr = CDate("1/1/" & mtbYear.Text)
firstDayOfNextYr = firstDayOfYr.AddYears(1)
numDays = DateDiff(DateInterval.Day, firstDayOfYr, firstDayOfNextYr)
txtNumDays.Text = CStr(numDays)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 32 of 443)
78. Private Sub Determine_Click(...) Handles btnDetermine.Click
'Day of week
Dim dt As Date = CDate(mtbDate.Text)
Dim fullDate As String = dt.ToString("D")
Dim position As Integer = fullDate.IndexOf(",")
Dim dayOfWeek As String = fullDate.Substring(0, position)
txtDayOfWeek.Text = dayOfWeek
End Sub
79. Private Sub Determine_Click(...) Handles btnDetermine.Click
'Day of week
Dim dt As Date = CDate(mtbDate.Text)
Dim laterDate = dt.AddYears(10)
Dim fullDate As String = laterDate.ToString("D")
Dim position As Integer = fullDate.IndexOf(",")
Dim dayOfWeek As String = fullDate.Substring(0, position)
txtDayOfWeek.Text = dayOfWeek
End Sub
80. Private Sub Determine_Click(...) Handles btnDetermine.Click
'Day of birth
Dim dt As Date = CDate(mtbDate.Text)
Dim turn21Date = dt.AddYears(21)
Dim fullDate As String = turn21Date.ToString("D")
Dim position As Integer = fullDate.IndexOf(",")
Dim dayOfWeek As String = fullDate.Substring(0, position)
txtDayOfWeek.Text = dayOfWeek
End Sub
81. Private Sub btnConvert_Click(...) Handles btnConvert.Click
'Convert date formats
Dim dt As Date
dt = CDate(txtUS.Text)
txtEurope.Text = dt.Day & "/" & dt.Month & "/" & dt.Year
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 33 of 443)
82. Private Sub btnWhen_Click(...) Handles btnWhen.Click
'Valentine’s day
Dim yr As String
Dim dt As Date
yr = txtYear.Text
dt = CDate("2/14/" & yr)
txtDate.Text = dt.ToString("D")
End Sub
83. Private Sub Determine_Click(...) Handles btnDetermine.Click
'Length of month
Dim month, yr As Integer
'month given as 1 through 12
Dim dt, dt2 As Date
Dim numDays As Double
month = CInt(txtMonth.Text)
yr = CInt(mtbYear.Text)
dt = CDate(month & "/1/" & yr)
dt2 = dt.AddMonths(1)
numDays = DateDiff(DateInterval.Day, dt, dt2)
txtNumDays.Text = CStr(numDays)
End Sub
84. Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Age on Mercury
Dim dob As Date = CDate(mtbDayOfBirth.Text)
Dim ageOnEarthInDays, ageOnMercuryInYears As Double
txtToday.Text = Today.ToString("d")
ageOnEarthInDays = DateDiff(DateInterval.Day, dob, Today)
ageOnMercuryInYears = ageOnEarthInDays / 88
txtAgeOnMercury.Text = ageOnMercuryInYears.ToString("N1") & " Mercurian years"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 34 of 443)
85. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Change in salary
Dim begSalary, salary As Decimal
begSalary = CDec(txtBeginningSalary.Text)
salary = begSalary + (0.1D * begSalary)
salary = salary – (0.1D * salary)
txtNewSalary.Text = salary.ToString("C")
txtChange.Text = ((salary - begSalary) / begSalary).ToString("P")
End Sub
86. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Change in salary
Dim begSalary, salary As Decimal
begSalary = CDec(txtBeginningSalary.Text)
salary = begSalary + 0.05D * begSalary
salary = salary + 0.05D * salary
salary = salary + 0.05D * salary
txtNewSalary.Text = salary.ToString("C")
txtChange.Text = ((salary - begSalary) / begSalary).ToString("P")
End Sub
87. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Taxi fare
Dim distance As Double
distance = CDbl(txtDistance.Text)
txtFare.Text = (0.8 + 0.2 * (Int(4 * distance))).ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 35 of 443)
88. Private Sub txtCalculate_Click(...) Handles txtCalculate.Click
'Marketing terms
Dim purchasePrice As Decimal = CDec(txtPurchasePrice.Text)
Dim sellingPrice As Decimal = CDec(txtSellingPrice.Text)
Dim markup, percentageMarkup, profitMargin As Decimal
markup = sellingPrice - purchasePrice
percentageMarkup = markup / purchasePrice
profitMargin = markup / sellingPrice
txtMarkup.Text = markup.ToString("C")
txtPercentageMarkup.Text = percentageMarkup.ToString("P")
txtProfitMargin.Text = profitMargin.ToString("P")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 36 of 443)
CHAPTER 3 PROGRAMMING PROJECTS
1. Private Sub btnAdd_Click(...) Handles btnAdd.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " + " & num2 & " = " & num1 + num2
End Sub
Private Sub btnSubtract_Click(...) Handles btnSubtract.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " - " & num2 & " = " & num1 - num2
End Sub
Private Sub btnMultiply_Click(...) Handles btnMultiply.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " x " & num2 & " = " & (num1 * num2)
End Sub
Private Sub input_TextChanged(...) Handles txtFirstNum.TextChanged,
txtSecondNum.TextChanged
txtOutput.Clear()
End Sub
2. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Const TAX_RATE As Decimal = 0.05D
'5% sales tax
Const LABOR_RATE As Decimal = 35D
'dollars per hour
Dim labor, parts, total As Decimal
labor = CDec(txtHours.Text) * LABOR_RATE 'cost of labor
parts = CDec(txtCost.Text)
parts += parts * TAX_RATE
total = labor + parts
lstBill.Items.Clear()
lstBill.Items.Add("Customer
" & txtCustomer.Text)
lstBill.Items.Add("Labor cost
" & labor.ToString("C"))
lstBill.Items.Add("Parts cost
" & parts.ToString("C"))
lstBill.Items.Add("Total cost
" & total.ToString("C"))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 37 of 443)
3. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim remainder As Integer = CInt(txtAmount.Text)
Dim quarters, dimes, nickels, cents As Integer
quarters = remainder \ 25
remainder = remainder Mod 25
dimes = remainder \ 10
remainder = remainder Mod 10
nickels = remainder \ 5
remainder = remainder Mod 5
cents = remainder
txtQuarters.Text = CStr(quarters)
txtDimes.Text = CStr(dimes)
txtNickels.Text = CStr(nickels)
txtCents.Text = CStr(cents)
End Sub
4. Private Sub btnConvert_Click(...) Handles btnConvert.Click
'Length conversion
Dim totalInches As Double
Dim totalMeters As Double
Dim meters, kilometers As Double
Dim centimeters As Double
'Step #1: Add up given measurements into inches
totalInches = CDbl(txtInches.Text) 'inches box
totalInches += 12 * CDbl(txtFeet.Text) 'add in feet
totalInches += 36 * CDbl(txtYards.Text) 'add in yards
totalInches += 63360 * CDbl(txtMiles.Text) 'add in miles
'Step #2: Convert total inches into total meters
totalMeters = totalInches / 39.37 'total inches to total meters
'Step #3: Compute kilometers, whole meters, and centimeters
'Step 3a: compute # of kilometers, subtract from meters
kilometers = Int(totalMeters / 1000)
totalMeters = totalMeters – (1000 * kilometers)
'Put the whole part of totalMeters into meters,
'and the fractional part into centimeters.
meters = Int(totalMeters)
centimeters = 100 * (totalMeters - meters)
centimeters = Math.Round(centimeters, 1)
lstOutput.Items.Clear()
lstOutput.Items.Add("The metric length is")
lstOutput.Items.Add(kilometers & " kilometers")
lstOutput.Items.Add(meters & " meters")
lstOutput.Items.Add(centimeters & " centimeters.")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 38 of 443)
5. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Car loan
Dim loanAmount, interestRate, monthlyPayment, i As Decimal
'i is the monthly interest in decimal form
Dim numYears As Integer
loanAmount = CDec(txtAmount.Text)
interestRate = CDec(txtInterest.Text)
numYears = CInt(txtYears.Text)
i = interestRate / 1200
monthlyPayment = CDec(i / (1 - ((1 + i) ^ (-12 * numYears)))) * loanAmount
txtMonthlyPayment.Text = monthlyPayment.ToString("C")
End Sub
6. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Unit price
Dim price, pricePerOunce As Decimal
Dim pounds, ounces, weightInOunces As Integer
price = CDec(txtPrice.Text)
pounds = CInt(txtPounds.Text)
ounces = CInt(txtOunces.Text)
weightInOunces = 16 * pounds + ounces
pricePerOunce = price / weightInOunces
txtUnitPrice.Text = pricePerOunce.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 39 of 443)
7. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Bond yield to maturity
Dim faceValue, couponRate, interest, marketPrice, yrsUntilMaturity
Dim a, b, ytm As Decimal
faceValue = CDec(txtFaceValue.Text)
couponRate = CDec(txtInterestRate.Text)
interest = faceValue * couponRate
marketPrice = CDec(txtMarketPrice.Text)
yrsUntilMaturity = CDec(txtYrsUntilMaturity.Text)
a = (faceValue - marketPrice) / yrsUntilMaturity
b = (faceValue + marketPrice) / 2
ytm = (interest + a) / b
txtYTM.Text = ytm.ToString("P")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 40 of 443)
CHAPTER 4
EXERCISES 4.1
1. hi
2. C#
4. B
3. The letter before G is F
5. "We're all in this alone." - Lily Tomlin
6. D is the 4th letter of the alphabet.
7. True
8. False
9. True
10. False
11. True
12. False
13. True
15. False
16. False
17. False
18. True
19. True
20. True
21. True
22. True
23. False
24. True
25. False
26. True
27. False
28. True
30. True
31. Equivalent
32. Not equivalent
35. Equivalent
36. Not equivalent
39. a <= b
40. (a <> b) And (a <> d)
41. (a >= b) Or (c = d)
33. Not equivalent
37. Not equivalent
14. True
29. True
34. Equivalent
38. Not equivalent
42. (a = b) Or (a > b)
43. (a = "") Or (a >= b) Or (a.Length >= 5)
44. a > b
[In Exercises 45 through 48, execute a statement of the form txtOutput.Text = CStr(Boolean
expression).]
45. True 46. True
47. True 48. False
49. False
50. True
51. False
52. True
53. True 54. True
55. True 56. False
57. False
58. True
59. True
60. False
61. Private Sub btnFind_Click(...) Handles btnFind.Click
'Find the position of a letter in the alphabet.
Dim letter As String, position As Integer
letter = txtLetter.Text.ToUpper
position = Asc(letter) - 64
txtPosition.Text = CStr(position)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 41 of 443)
EXERCISES 4.2
1. Less than ten.
2. Student
3. Your change contains 3 dollars.
4. Cost of cloth: $15.50
5. To be, or not to be.
6. A is a vowel.
7. Hi
8. positive
9. You are old enough to vote in 7 days.
10. You are younger than Nick.
11. Syntax error. Third line should be If ((1 < num) And (num < 3)) Then
12. Syntax error. The variable num is missing from the second part of the condition. Should be
If ((num > 5) And (num < 9)) Then
13. Syntax error. Fourth line should be If ((major = "Business") Or (major = "Computer
Science")) Then
14. Logic Error. If the user enters "True", the switch changes to "off" and then back to "on".
15. a = 5
16. If j = 7 Then
b = 1
Else
b = 2
End If
17. message = "Is Alaska bigger than Texas and California combined?"
answer = InputBox(message)
If (answer.Substring(0, 1).ToUpper = "Y") Then
txtOutput.Text = "Correct"
Else
txtOutput.Text = "Wrong"
End If
18. message = "How tall (in feet) is the Statue of Liberty?"
feet = CDbl(InputBox(message))
If (feet > 141) And (feet < 161) Then
lstOutput.Items.Add("Close")
Else
lstOutput.Items.Add("Nope")
End If
lstOutput.Items.Add("The statue is 151 feet from base to torch.")
19. If IsNumeric(txtBox.Text) AndAlso (CDbl(txtBox.Text) < 0) Then
MessageBox.Show("negative")
End If
20. If (str1 <> "") AndAlso (m = (str2.Length / str1.Length)) Then
txtBox.Text = str1 & str2
End If
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 42 of 443)
21. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim cost, tip As Decimal
cost = CDec(txtAmount.Text)
tip = cost * 0.18D
If tip < 1 Then
tip = 1
End If
txtOutput.Text = tip.ToString("C")
End Sub
22. Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Determine cost of bagels.
Dim num As Integer, cost As Decimal
num = CInt(txtNumber.Text)
If num < 6 Then
cost = 0.75D * num
Else
cost = 0.6D * num
End If
txtCost.Text = cost.ToString("C")
End Sub
23. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim num, cost As Decimal
num = CDec(txtNumber.Text)
If num < 100 Then
cost = 0.25D * num '25 cents each
Else
cost = 0.2D * num
'20 cents each
End If
txtOutput.Text = cost.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 43 of 443)
24. Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Determine cost of copies.
Dim num As Integer, cost As Decimal
num = CInt(txtNumber.Text)
If num < 100 Then
cost = 0.05D * num
Else
cost = 5 + 0.03D * (num - 100)
End If
txtCost.Text = cost.ToString("C")
End Sub
25. Private Sub btnAskQuestion_Click(...) Handles btnAskQuestion.Click
Dim name As String
name = (txtAnswer.Text).ToUpper
If name = "WILLARD SCOTT" Then
txtOutput.Text = "Correct."
Else
txtOutput.Text = "Nice try."
End If
End Sub
26. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim wage, hours, grossPay As Decimal
wage = CDec(txtHourlyWage.Text)
'Hourly pay
hours = CDec(txtHoursWorked.Text) 'Hours worked
If hours <= 40 Then
grossPay = wage * hours
Else
grossPay = (wage * 40) + (1.5D * wage * (hours - 40))
End If
txtGrossPay.Text = grossPay.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 44 of 443)
27. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim s1, s2, s3 As Double '3 scores
Dim avg As Double
'average of the two highest scores
s1 = CDbl(txtScore1.Text)
s2 = CDbl(txtScore2.Text)
s3 = CDbl(txtScore3.Text)
If (s1 <= s2) And (s1 <= s3) Then
's1 is smallest number
avg = (s2 + s3) / 2
ElseIf (s2 <= s1) And (s2 <= s3) Then 's2 is smallest number
avg = (s1 + s3) / 2
Else
's3 is smallest number
avg = (s1 + s2) / 2
End If
txtAverage.Text = CStr(avg)
End Sub
28. Private Sub btnCompute_Click(...) Handles btnTranslate.Click
'convert to Pig Latin
Dim word, firstLetter As String
Dim positionOfFirstVowel As Integer
word = txtWord.Text.ToLower
firstLetter = word.Substring(0, 1)
If "aeiou".IndexOf(firstLetter) <> -1 Then
word &= "way"
Else
positionOfFirstVowel = word.Length - 1
If (word.IndexOf("a") <> -1) And (word.IndexOf("a") < positionOfFirstVowel) Then
positionOfFirstVowel = word.IndexOf("a")
End If
If (word.IndexOf("e") <> -1) And (word.IndexOf("e") < positionOfFirstVowel) Then
positionOfFirstVowel = word.IndexOf("e")
End If
If (word.IndexOf("i") <> -1) And (word.IndexOf("i") < positionOfFirstVowel) Then
positionOfFirstVowel = word.IndexOf("i")
End If
If (word.IndexOf("o") <> -1) And (word.IndexOf("o") < positionOfFirstVowel) Then
positionOfFirstVowel = word.IndexOf("o")
End If
If (word.IndexOf("u") <> -1) And (word.IndexOf("u") < positionOfFirstVowel) Then
positionOfFirstVowel = word.IndexOf("u")
End If
word = word.Substring(positionOfFirstVowel) &
word.Substring(0, positionOfFirstVowel) & "ay"
End If
txtOutput.Text = "The word in pig latin is " & word & "."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 45 of 443)
29. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim weight, cost, amount, change As Decimal
weight = CDec(txtWeight.Text)
amount = CDec(txtAmount.Text)
cost = weight * 2.5D
If (amount >= cost) Then
change = amount - cost
txtOutput.Text = "Your change is " & change.ToString("C") & "."
Else
txtOutput.Text = "I need " & (cost - amount).ToString("C") & " more."
End If
End Sub
30. Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Savings account withdrawal
Dim balance, amountOfWithdrawal As Decimal
balance = CDec(txtCurrentBalance.Text)
amountOfWithdrawal = CDec(txtWithdrawal.Text)
If (balance >= amountOfWithdrawal) Then
balance = balance - amountOfWithdrawal
txtOutput.Text = "New balance is " & balance.ToString("C") & "."
If balance < 150 Then
MessageBox.Show("Balance below $150", "Warning")
End If
Else
txtOutput.Text = "Withdrawal denied."
End If
End Sub
31. Private Sub btnQuit_Click(...) Handles btnQuit.Click
'Quit?
Dim answer As String
answer = InputBox("Do you really want to quit? (Y/N)")
answer = answer.Substring(0, 1).ToUpper
If (answer = "Y") Then
Me.Close()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 46 of 443)
32. Private Sub btnCompute_Click(...) Handles lblDetermine.Click
'Test if year is a leap year
'Note: The number n is divisible by 4 if n Mod 4 = 0.
Dim yr As Integer
yr = CInt(txtYear.Text)
If (yr Mod 4 = 0) And
((yr Mod 100 <> 0) Or (yr Mod 400 = 0)) Then
txtLeapYear.Text = "YES"
Else
txtLeapYear.Text = "NO"
End If
End Sub
33. Dim numLines As Integer = 0 'In Declarations section of Code Editor
'numLines tells the number of lines that have been displayed.
Private Sub btnBogart_Click(...) Handles btnBogart.Click
If numLines = 0 Then
lstOutput.Items.Add("I came to Casablanca for the waters.")
numLines += 1
ElseIf numLines = 2 Then
lstOutput.Items.Add("I was misinformed.")
numLines += 1
End If
End Sub
Private Sub btnRaines_Click(...) Handles btnRaines.Click
If numLines = 1 Then
lstOutput.Items.Add("But we're in the middle of the desert.")
numLines += 1
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 47 of 443)
34. Dim hue As String = "Black"
Private Sub btnChangeColor_Click(...) Handles btnChangeColor.Click
If hue = "Black" Then
txtBox.ForeColor = Color.Red
hue = "Red"
btnChangeColor.Text = "Change Color of Text to Black"
Else
txtBox.ForeColor = Color.Black
hue = "Black"
btnChangeColor.Text = "Change Color of Text to Red"
End If
End Sub
35. Private Sub btnConvertToRegular_Click(...) Handles btnConvertToRegular.Click
Dim partOfDay As String
Dim time As String = mtbMilitary.Text
Dim hours As Integer = CInt(time.Substring(0, 2))
Dim minutes As String = time.Substring(2, 2)
If hours >= 12 Then
partOfDay = "pm"
Else
partOfDay = "am"
End If
If time = "0000" Then
txtRegular.Text = "midnight"
ElseIf time = "1200" Then
txtRegular.Text = "noon"
ElseIf hours = 0 Or hours = 12 Then
txtRegular.Text = "12:" & minutes & " " & partOfDay
Else
txtRegular.Text = (hours Mod 12) & ":" & minutes & " " & partOfDay
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 48 of 443)
36. Dim h1, h2 As Double
'2 highest test scores, in order
'h1 has highest value of the two
Private Sub btnRead_Click(...) Handles btnRead.Click
Dim newScore As Double
'Read in a test score
newScore = CDbl(txtScore.Text)
If newScore > h1 Then
h2 = h1
h1 = newScore
ElseIf newScore > h2 Then
h2 = newScore
End If
txtScore.Text = ""
txtScore.Focus()
End Sub
Private Sub btndisplay_Click(...) Handles btndisplay.Click
'Show the two highest test scores so far
txtHighest.Text = h1 & " " & h2
txtScore.Focus()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 49 of 443)
37. Dim numGuesses As Integer = 0
Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
'Assume that the Text property of txtNumberOfGuesses
'was set to 0 in the Form Designer
numGuesses += 1
txtNumberOfGuesses.Text = CStr(numGuesses)
Dim msg As String
If txtAnswer.Text.ToUpper.IndexOf("COOLIDGE") <> -1 Then
MessageBox.Show("Calvin Coolidge was born on July 4, 1872.",
"Correct")
Me.Close()
ElseIf CInt(numGuesses) = 10 Then
msg = "Calvin Coolidge was born on July 4, 1872."
MessageBox.Show(msg, "You've Run Out of Guesses")
Me.Close()
Else
If CInt(numGuesses) = 3 Then
msg = "He once said, 'If you don't say anything," &
" you won't be called upon to repeat it.'"
ElseIf CInt(numGuesses) = 7 Then
msg = "His nickname was 'Silent Cal.'"
Else
msg = "Sorry!"
End If
MessageBox.Show(msg, "Incorrect")
End If
txtAnswer.Clear()
txtAnswer.Focus()
End Sub
38. Private Sub btnCalculateTax_Click(...) Handles btnCalculateTax.Click
'Calculate state income tax
Dim income, tax As Decimal
income = CDec(txtIncome.Text)
If income <= 20000 Then
tax = 0.02D * income
Else
If income <= 50000 Then
tax = 400 + 0.025D * (income - 20000)
Else
tax = 1150 + 0.035D * (income - 50000)
End If
End If
txtOutput.Text = "Tax is " & tax.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 50 of 443)
39. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim dob As Date = CDate(txtDOB.Text)
Dim numDays As Double
Dim birthdayToUse As Date
birthdayToUse = CDate(dob.Month & "/" & dob.Day & "/" & Today.Year)
If birthdayToUse < Today Then
birthdayToUse = birthdayToUse.AddYears(1)
End If
numDays = DateDiff(DateInterval.Day, Today, birthdayToUse)
If numDays = 0 Then
MessageBox.Show("HAPPY BIRTHDAY")
End If
txtNumDays.Text = CStr(numDays)
txtToday.Text = CStr(Today)
End Sub
40. Private Sub Determine_Click(...) Handles btnDetermine.Click
'DateDiff(DateInterval.Year, d1, d2) uses only the year
'parts of the two dates in its computation.
'lblAnswer.Text = "Twenty-five?"
'lblDays.Text = "Days to wait:"
lblDays.Visible = False
txtDays.Visible = False
Dim dt As Date = CDate(mtbDate.Text)
Dim turn25Date = dt.AddYears(25)
Dim approximateAge As Double = DateDiff(DateInterval.Year, dt, Today)
If Today >= turn25Date Then
txtAnswer.Text = "YES"
Else
txtAnswer.Text = "NO"
Dim numDays As Double = DateDiff(DateInterval.Day, Today, turn25Date)
lblDays.Visible = True
txtDays.Visible = True
txtDays.Text = CStr(numDays)
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 51 of 443)
41. Private Sub Determine_Click(...) Handles btnDetermine.Click
'DateDiff(DateInterval.Year, d1, d2) uses only the year
'parts of the two dates in its computation.
Dim dt, dt2 As Date
Dim approximateAge As Double
dt = CDate(mtbDate.Text)
approximateAge = DateDiff(DateInterval.Year, dt, Today)
dt2 = dt.AddYears(CInt(approximateAge))
If Today < dt2 Then
txtAge.Text = CStr(approximateAge - 1)
Else
txtAge.Text = CStr(approximateAge)
End If
End Sub
42. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
If lblLanguage.Visible Then
lblLanguage.Visible = False
btnDisplay.Text = "Show Name of Language"
Else
lblLanguage.Visible = True
btnDisplay.Text = "Hide Name of Language"
End If
End Sub
43. Private Sub btnCompute_Click(...) Handles lblDetermine.Click
Dim day As String
Dim day1, day2 As Date
Dim numDays As Double
day = "1/1/" & txtYear.Text
day1 = CDate(day)
day2 = day1.AddYears(1)
numDays = DateDiff(DateInterval.Day, day1, day2)
If numDays = 366 Then
txtLeapYear.Text = "YES"
Else
txtLeapYear.Text = "NO"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 52 of 443)
44. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim ipp1, ipp2 As Decimal
Dim apy1, apy2 As Decimal
ipp1 = CDec(txtRate1.Text) / (100 * CDec(txtPeriods1.Text))
ipp2 = CDec(txtRate2.Text) / (100 * CDec(txtPeriods2.Text))
apy1 = CDec((1 + ipp1) ^ CInt(txtPeriods1.Text) – 1)
apy2 = CDec((1 + ipp2) ^ CInt(txtPeriods2.Text) – 1)
txtAPY1.Text = apy1.ToString("P3")
txtAPY2.Text = apy2.ToString("P3")
If apy1 = apy2 Then
txtBest.Text = "Neither"
ElseIf apy1 < apy2 Then
txtBest.Text = "Bank 2"
Else
txtBest.Text = "Bank 1"
End If
End Sub
45. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim gpa As Double = CDbl(txtGPA.Text)
Dim honors As String = ""
If gpa >= 3.9 Then
honors = " summa cum laude."
End If
If (3.6 <= gpa) And (gpa < 3.9) Then
honors = " magna cum laude."
End If
If (3.3 <= gpa) And (gpa < 3.6) Then
honors = " cum laude."
End If
If (2 <= gpa) And (gpa < 3.3) Then
honors = "."
End If
txtOutput.Text = "You graduated" & honors
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 53 of 443)
46. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim gpa As Double = CDbl(txtGPA.Text)
txtOutput.Text = ""
If (2 <= gpa) And (gpa <= 4) Then
Dim honors As String = ""
If gpa >= 3.9 Then
honors = " summa cum laude."
ElseIf gpa >= 3.6 Then
honors = " magna cum laude."
ElseIf gpa >= 3.3 Then
honors = " cum laude."
ElseIf gpa >= 2 Then
honors = "."
End If
txtOutput.Text = "You graduated" & honors
Else
MessageBox.Show("GPA must be between 2 and 4.", "Try Again.")
End If
End Sub
47. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim largestNum As Double = CDbl(txtFirstNum.Text)
If CDbl(txtSecondNum.Text) > largestNum Then
largestNum = CDbl(txtSecondNum.Text)
End If
If CDbl(txtThirdNum.Text) > largestNum Then
largestNum = CDbl(txtThirdNum.Text)
End If
txtLargestNum.Text = CStr(largestNum)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 54 of 443)
48. Private Sub btnAdd_Click(...) Handles btnAdd.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " + " & num2 & " = " & num1 + num2
End Sub
Private Sub btnSubtract_Click(...) Handles btnSubtract.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " - " & num2 & " = " & num1 - num2
End Sub
Private Sub btnMultiply_Click(...) Handles btnMultiply.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " x " & num2 & " = " & (num1 * num2)
End Sub
Private Sub btnDivide_Click(...) Handles btnDivide.Click
Dim num1 As Double = CDbl(txtFirstNum.Text)
Dim num2 As Double = CDbl(txtSecondNum.Text)
txtOutput.Text = num1 & " / " & num2 & " = " & (num1 / num2)
End Sub
Private Sub input_TextChanged(...) Handles txtFirstNum.TextChanged,
txtSecondNum.TextChanged
txtOutput.Clear()
If txtSecondNum.Text = "0" Then
btnDivide.Enabled = False
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 55 of 443)
49. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Buy two, get one free sale
Dim cost1, cost2, cost3, minimumCost As Decimal
cost1 = CDec(txtCostOfItem1.Text)
cost2 = CDec(txtCostOfItem2.Text)
cost3 = CDec(txtCostOfItem3.Text)
minimumCost = cost1
If cost2 < minimumCost Then
minimumCost = cost2
End If
If cost3 < minimumCost Then
minimumCost = cost3
End If
txtTotalCost.Text = (cost1 + cost2 + cost3 –
minimumCost).ToString("C")
End Sub
50. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Second suit half-off sale
Dim cost1, cost2, totalCost As Decimal
cost1 = CDec(txtCostOfFirstSuit.Text)
cost2 = CDec(txtCostOfSecondSuit.Text)
If cost1 < cost2 Then
totalCost = cost2 + 0.5D * cost1
Else
totalCost = cost1 + 0.5D * cost2
End If
txtTotalCost.Text = totalCost.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 56 of 443)
51. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Sort three numbers.
Dim max, min As Double
max = CDbl(txtNum1.Text)
If CDbl(txtNum2.Text) > max Then
max = CDbl(txtNum2.Text)
End If
If CDbl(txtNum3.Text) > max Then
max = CDbl(txtNum3.Text)
End If
txtMax.Text = CStr(max)
min = CDbl(txtNum1.Text)
If CDbl(txtNum2.Text) < min Then
min = CDbl(txtNum2.Text)
End If
If CDbl(txtNum3.Text) < min Then
min = CDbl(txtNum3.Text)
End If
txtMin.Text = CStr(min)
If (CDbl(txtNum1.Text) < max) AndAlso (CDbl(txtNum1.Text) > min) Then
txtMiddle.Text = txtNum1.Text
End If
If (CDbl(txtNum2.Text) < max) AndAlso (CDbl(txtNum2.Text) > min) Then
txtMiddle.Text = txtNum2.Text
End If
If (CDbl(txtNum3.Text) < max) AndAlso (CDbl(txtNum3.Text) > min) Then
txtMiddle.Text = txtNum3.Text
End If
End Sub
EXERCISES 4.3
1. The price is $3.75
The price is $3.75
2. case 2
case 1
case 3
3. Mesozoic Era
Paleozoic Era
?
4. Incorrect. At age 43, he was the youngest person elected president.
Correct. He became president at age 42 when President McKinley was
assassinated.
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Instructor Solutions Manual (Page 57 of 443)
5. The equation has no real solutions.
The equation has two solutions.
The equation has exactly one solution.
6. Hi
Hi
7. Should have a Case clause before the 4th line.
8. Both Case clauses are invalid.
The first one should be Case 3 To 10.
The second one should have a comma instead of a semicolon.
9. Case nom = "Bob" should be Case "Bob"
10. In Case clause, h should be "h".
11. Logic error: >= "Peach" should be >= "PEACH".
Syntax error: "ORANGE TO PEACH" should be "ORANGE" To "PEACH".
12. First Case clause should be Is < 10000
Second Case clause should be Case 10000 To 30000
13. Valid
14. Valid
15. Invalid
16. Invalid
17. Valid
19. Select Case a
Case 1
txtOutput.Text = "one"
Case Is > 5
txtOutput.Text = "two"
End Select
20. Select Case a
Case 1
lstOutput.Items.Add("lambs")
lstOutput.Items.Add("eat")
Case Is < 4
lstOutput.Items.Add("eat")
Case 5, Is > 7
lstOutput.Items.Add("ivy")
End Select
21. Select Case a
Case 2
txtOutput.Text = "maybe"
Case Is > 5
txtOutput.Text = "no"
End Select
22. Select Case a
Case 1, 3
a = 2
Case 2
a = 3
End Select
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18. Valid
Instructor Solutions Manual (Page 58 of 443)
23. Private Sub btnDescribe_Click(...) Handles btnDescribe.Click
Dim percent As Integer
percent = CInt(txtPercent.Text)
Select Case percent
Case 0 To 30
txtOutput.Text = "Clear"
Case 31 To 70
txtOutput.Text = "Partly cloudy"
Case 71 To 99
txtOutput.Text = "Cloudy"
Case 100
txtOutput.Text = "Overcast"
Case Else
txtOutput.Text = "Percentage must be between 0 and 100."
End Select
End Sub
24. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim callNumber As Integer
callNumber = CInt(txtCallNum.Text)
Select Case callNumber
Case 100 To 199
txtLocation.Text = "basement"
Case 200 To 500, Is > 900
txtLocation.Text = "main floor"
Case 700 To 750
txtLocation.Text = "archives"
Case 501 To 900
txtLocation.Text = "upper floor"
Case Else
MessageBox.Show("The call number must be greater than 100.",
"Try
Again")
txtCallNum.Clear()
txtCallNum.Focus()
End Select
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 59 of 443)
25. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim shapeNum As Integer
Dim radius, length, height, width As Double
'Input choice of shape and its dimensions
'1. Circle
2. Parallelogram
3. Kite
shapeNum = CInt(mtbSelection.Text)
'Mask is 0
Select Case shapeNum
Case 1
radius = CDbl(InputBox("Input the radius of the circle: "))
txtArea.Text = CStr(3.141593 * radius ^ 2)
Case 2
length = CDbl(InputBox("Input the length of the parallelogram: "))
height = CDbl(InputBox("Input the height of the parallelogram: "))
txtArea.Text = CStr(length * height)
Case 3
length = CDbl(InputBox("Input the length of the kite: "))
width = CDbl(InputBox("Input the width of the kite: "))
txtArea.Text = CStr((length * width) / 2)
Case Else
MessageBox.Show("Your choice is not valid.", "Try Again.")
mtbSelection.Clear()
End Select
mtbSelection.Focus()
End Sub
26. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim a, b, c, x, totalRev, totalCost As Decimal
a = CDec(txtMarRev.Text)
b = CDec(txtMarCost.Text)
c = CDec(txtFixedCost.Text)
x = CDec(txtNumUnits.Text)
totalRev = a * x
totalCost = (b * x) + c
Select Case (totalRev - totalCost)
Case Is > 0
txtStatus.Text = "PROFIT"
Case Is < 0
txtStatus.Text = "LOSS"
Case 0
txtStatus.Text = "BREAK EVEN"
End Select
End Sub
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Instructor Solutions Manual (Page 60 of 443)
27. Private Sub btnAssign_Click(...) Handles btnAssign.Click
Dim score As Integer, letterGrade As String
score = CInt(txtNumericalGrade.Text)
Select Case score
Case 90 To 100
letterGrade = "A"
Case 80 To 89
letterGrade = "B"
Case 70 To 79
letterGrade = "C"
Case 60 To 69
letterGrade = "D"
Case 0 To 59
letterGrade = "F"
Case Else
letterGrade = "Invalid"
End Select
txtOutput.Text = letterGrade
End Sub
28. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim num As Integer, totalCost As Decimal, cancelled As Boolean
If IsNumeric(txtNumber.Text) Then
num = CInt(txtNumber.Text)
Select Case num
Case Is < 10
cancelled = True
Case Is < 21
totalCost = 500 * num
Case Is < 31
totalCost = 450 * num
Case Else
totalCost = 400 * num
End Select
If cancelled Then
txtTotalCost.Text = "Tour Cancelled"
Else
txtTotalCost.Text = totalCost.ToString("C")
End If
Else
MessageBox.Show("You must enter a number.")
End If
End Sub
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Instructor Solutions Manual (Page 61 of 443)
29. Private Sub btnDescribe_Click(...) Handles btnDetermine.Click
Dim amountRecovered, payment As Decimal
amountRecovered = CDec(txtAmount.Text))
Select Case amountRecovered
Case Is <= 75000
payment = 0.1D * amountRecovered
Case Is <= 100000
payment = 7500 + 0.05D * (amountRecovered - 75000)
Case Is > 100000
payment = 8750 + 0.01D * (amountRecovered - 100000)
If payment > 50000 Then
payment = 50000
End If
End Select
txtOutput.Text = payment.ToString("C")
End Sub
30. Private Sub btnTranslate_Click(...) Handles btnTranslate.Click
Dim abbrev As String
'Translate doctors' abbreviations
abbrev = txtAbbreviation.Text
'Translate abbreviation into English
Select Case abbrev
Case "ac"
txtOutput.Text = Chr(34) & abbrev & Chr(34) & "
before meals"
Case "ad lib"
txtOutput.Text = Chr(34) & abbrev & Chr(34) & "
freely as needed"
Case "bid"
txtOutput.Text = Chr(34) & abbrev & Chr(34) & "
twice daily"
Case "gtt"
txtOutput.Text = Chr(34) & abbrev & Chr(34) & "
a drop"
Case "hs"
txtOutput.Text = Chr(34) & abbrev & Chr(34) & "
at bedtime"
Case "qid"
txtOutput.Text = Chr(34) & abbrev & Chr(34) & "
four times a day"
Case Else
txtOutput.Text = "Abbreviation not known."
End Select
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 62 of 443)
31. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim tin As String = mtbTIN.Text
Dim finalDigit As String = tin.Substring(3, 1)
Dim suffix As String
Select Case finalDigit
Case "1"
suffix = " st"
Case "2"
suffix = " nd"
Case "3"
suffix = " rd"
Case Else
suffix = " th"
End Select
txtYear.Text = "20" & tin.Substring(0, 2)
txtWeek.Text = tin.Substring(2, 2) & suffix
End Sub
32. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim income, tax As Decimal
income = CDec(txtIncome.Text)
Select Case income
Case Is < 9225
tax = CDec(0.1 * income)
Case Is < 37450
tax = CDec(922.5 + 0.15 * (income - 9225))
Case Is < 90750
tax = CDec(4867.5 + 0.25 * (income - 37450))
Case Is < 189300
tax = CDec(17442.5 + 0.28 * (income - 90750))
Case Is < 411500
tax = CDec(43482.5 + 0.33 * (income - 189300))
Case Is < 413200
tax = CDec(43482.5 + 0.35 * (income - 411500))
Case Else
tax = CDec(112683.5 + 0.396 * (income - 413200))
End Select
txtTax.Text = tax.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 63 of 443)
33. Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
Dim amount, cost, costPerOzWithIncrease, costPerOzWithDiscount As Decimal
Dim betterOffer As String
amount = 18
cost = 9
costPerOzWithIncrease = cost / (1.5D * amount)
costPerOzWithDiscount = (0.65D * cost) / amount
txt50percentMore.Text = costPerOzWithIncrease.ToString("C4")
txt35percentDiscount.Text = costPerOzWithDiscount.ToString("C4")
Select Case costPerOzWithIncrease - costPerOzWithDiscount
Case Is > 0
betterOffer = "35% discount"
Case Is < 0
betterOffer = "50% more"
Case Else
betterOffer = "same value"
End Select
txtBetterOffer.Text = betterOffer
End Sub
34. Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
Dim cost, costWithDoubleDiscount, costWithSingleDiscount As Decimal
Dim betterOffer As String
cost = 100
costWithDoubleDiscount = cost * 0.8D * 0.75D
costWithSingleDiscount = cost * 0.6D
txt50percentMore.Text = costWithDoubleDiscount.ToString("C")
txt35percentDiscount.Text = costWithSingleDiscount.ToString("C")
Select Case costWithDoubleDiscount - costWithSingleDiscount
Case Is > 0
betterOffer = "single discount"
Case Is < 0
betterOffer = "double discount"
Case Else
betterOffer = "same value"
End Select
txtBetterOffer.Text = betterOffer
End Sub
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Instructor Solutions Manual (Page 64 of 443)
35. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim pres, state, trivia, whichBush As String
pres = txtLastName.Text
Select Case pres.ToUpper
Case "CARTER"
state = "Georgia"
trivia = "The only soft drink served in the Carter " &
"White House was Coca-Cola."
Case "REAGAN"
state = "California"
trivia = "His secret service code name was Rawhide."
Case "BUSH"
state = "Texas"
whichBush = InputBox("Are his middle initials HW or W?")
Select Case whichBush.ToUpper
Case "HW"
trivia = "He celebrated his 85th birthday by parachuting " &
"out of an airplane."
Case "W"
trivia = "He once owned the Texas Rangers baseball team."
End Select
Case "CLINTON"
state = "Arkansas"
trivia = "In college he did a good imitation of Elvis Presley."
Case "OBAMA"
state = "Illinois"
trivia = "He was the eighth left-handed president."
Case Else
state = ""
trivia = ""
End Select
If state <> "" Then
lstOutput.Items.Clear()
lstOutput.Items.Add("President " & pres & "'s" &
" home state was " & state & ".")
lstOutput.Items.Add(trivia)
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 65 of 443)
36. Private Sub btnHumor_Click(...) Handles btnHumor.Click
Dim num As Integer
Dim sentence As String = ""
num = CInt(mtbNumber.Text)
If (num >= 1) And (num <= 3) Then
Select Case num
Case 1
sentence = "I can resist everything except temptation."
Case 2
sentence = "I just heard from Bill Bailey. He's not coming home."
Case 3
sentence = "I have enough money to last the rest of my life," &
" unless I buy something."
End Select
txtOutput.Text = sentence
End If
mtbNumber.Clear()
mtbNumber.Focus()
End Sub
Private Sub btnInsult_Click(...) Handles btnInsult.Click
Dim num As Integer
Dim sentence As String = ""
num = CInt(mtbNumber.Text)
If (num >= 1) And (num <= 3) Then
Select Case num
Case 1
sentence = "How much would you charge to haunt a house?"
Case 2
sentence = "I bet you have no more friends than an alarm clock."
Case 3
sentence = "When your IQ rises to 30, sell."
End Select
txtOutput.Text = sentence
End If
mtbNumber.Clear()
mtbNumber.Focus()
End Sub
EXERCISES 4.4
1. The word "Income" becomes the caption embedded in the top of GroupBox1.
2. The CheckBox1 check box becomes (or remains) checked.
3. The CheckBox1 check box becomes (or remains) unchecked.
4. The word "Vanilla" becomes the caption following the check box with V as the access key for
toggling the check box.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 66 of 443)
5. The radio button becomes (or remains) unselected.
6. The selected item in the list box is placed into the text box.
7. The radio button’s caption becomes "Clear All" when the Alt key is pressed.
8. The radio button becomes (or remains) selected.
9. RadioButton1.Text = "Yes"
10. CheckBox1.Checked = False
11. CheckBox1.Checked = True
12. RadioButton2.Checked = False
13. RadioButton2 is on and RadioButton1 is off.
14. Neither RadioButton1 nor RadioButton2 are on.
15. Yes
17. Private Sub CheckedChanged(...) Handles _
radDeluxe.CheckedChanged, radSuper.CheckedChanged,
chkUpgradedVideo.CheckedChanged, chkModem.CheckedChanged,
chkMemory.CheckedChanged
If radDeluxe.Checked Or radSuper.Checked Then
Dim cost As Decimal = 0
'Add amounts to the cost based upon selections.
If radDeluxe.Checked Then
cost += 1000
Else
'Super model
cost += 1500
End If
If chkUpgradedVideo.Checked Then
cost += 200
End If
If chkModem.Checked Then
cost += 30
End If
If chkMemory.Checked Then
cost += 120
End If
txtTotalCost.Text = cost.ToString("C")
Else
MessageBox.Show("You must first select a model!")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 67 of 443)
18. Private Sub lstTo_SelectedIndexChanged(...) Handles lstTo.SelectedIndexChanged
txtFlight.Clear()
If lstFrom.Text = lstTo.Text Then
MessageBox.Show("The arrival city must differ from the departure city.")
lstTo.Text = Nothing
End If
End Sub
Private Sub lstFrom_SelectedIndexChanged(...) Handles _
lstFrom.SelectedIndexChanged
txtFlight.Clear()
If lstFrom.Text = lstTo.Text Then
MessageBox.Show("The departure city must differ from the arrival city.")
lstFrom.Text = Nothing
End If
End Sub
Private Sub btnBook_Click(...) Handles btnBook.Click
txtFlight.Clear()
If lstFrom.Text <> "" And lstTo.Text <> "" Then
txtFlight.Text = "You are flying from " & lstFrom.Text &
" to " & lstTo.Text & "."
ElseIf lstFrom.Text = "" Then
If lstTo.Text <> "" Then
MessageBox.Show("You must select a departure city.")
Else
MessageBox.Show("You must select a departure city and an arrival city.")
End If
Else
MessageBox.Show("You must select an arrival city.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 68 of 443)
19. Private Sub btnVote_Click(...) Handles btnVote.Click
If radCandidate1.Checked Then
txtVote.Text = "You voted for Kennedy."
ElseIf radCandidate2.Checked Then
txtVote.Text = "You voted for Nixon."
Else
txtVote.Text = "You voted for neither."
End If
End Sub
Private Sub btnClear_Click(...) Handles btnClear.Click
radCandidate1.Checked = False
radCandidate2.Checked = False
End Sub
20. Const INAUGURATION_DAY As Date = #1/20/2017#
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim dateOfBirth As Date = CDate(mtbDOB.Text)
Dim oldEnough As Boolean = False
If dateOfBirth.AddYears(35) <= INAUGURATION_DAY Then
oldEnough = True
End If
If radNbcYes.Checked And rad14YrsYes.Checked And oldEnough Then
txtOutput.Text = "You are eligible to run for president in 2016."
Else
txtOutput.Text = "You are not eligible to run for president in 2016."
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 69 of 443)
21. Private Sub btnRecord_Click(...) Handles btnRecord.Click
Dim majorSelected As Boolean
Dim yearSelected As Boolean
If lstMajors.Text = "" Then
majorSelected = False
Else
majorSelected = True
End If
If (radFrosh.Checked Or radSoph.Checked Or radJunior.Checked Or
radSenior.Checked) Then
yearSelected = True
Else
yearSelected = False
End If
If majorSelected And yearSelected Then
MessageBox.Show("Information Processed")
ElseIf Not majorSelected Then
If Not yearSelected Then
MessageBox.Show("You must select a Major and a Year.")
Else
MessageBox.Show("You must select a Major.")
End If
Else
MessageBox.Show("You must select a Year.")
End If
End Sub
22.(a)
Private Sub btnRecord_Click(...) Handles btnRecord.Click
If chkOptIn.Checked Then
txtOutput.Text = "You will be enrolled in the retirement plan."
Else
txtOutput.Text = "You have opted out of the retirement plan."
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 70 of 443)
22.(b)
Private Sub btnRecord_Click(...) Handles btnRecord.Click
If radYes.Checked Or radNo.Checked Then
If radYes.Checked Then
txtOutput.Text = "You will be enrolled in the retirement plan."
End If
If radNo.Checked Then
txtOutput.Text = "You have opted out of the retirement plan."
End If
Else
MessageBox.Show("You must make a selection.")
End If
End Sub
23. Private Sub CheckedChanged(...) Handles _
chkSenior.CheckedChanged, chkBlind.CheckedChanged,
chkSpouse.CheckedChanged, chkSpouseBlind.CheckedChanged
Dim count As Integer = 0
If chkSenior.Checked Then
count += 1
End If
If chkBlind.Checked Then
count += 1
End If
If chkSpouse.Checked Then
count += 1
End If
If chkSpouseBlind.Checked Then
count += 1
End If
txtOutput.Text = CStr(count)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 71 of 443)
24. Private Sub btnApply_Click(...) Handles btnApply.Click
If radFwhite.Checked Then
lblVB.ForeColor = Color.White
End If
If radFyellow.Checked Then
lblVB.ForeColor = Color.Yellow
End If
If radFred.Checked Then
lblVB.ForeColor = Color.Red
End If
If radFblue.Checked Then
lblVB.ForeColor = Color.Blue
End If
If radBwhite.Checked Then
lblVB.BackColor = Color.White
End If
If radByellow.Checked Then
lblVB.BackColor = Color.Yellow
End If
If radBred.Checked Then
lblVB.BackColor = Color.Red
End If
If radBblue.Checked Then
lblVB.BackColor = Color.Blue
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 72 of 443)
25. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim fee As Decimal = 0
If radAdult.Checked Or radSenior.Checked Then
Dim numExtras As Integer = 0
If chkTennis.Checked Then
numExtras += 1
End If
If chkLocker.Checked Then
numExtras += 1
End If
If chkLaundry.Checked Then
numExtras += 1
End If
If radAdult.Checked Then
fee = 100 + numExtras * 25
Else
fee = 75 + numExtras * 25
End If
txtFee.Text = fee.ToString("C")
Else
MessageBox.Show("You must select a membership category.")
End If
End Sub
26. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Const COST_16GB As Decimal = 5.99D
Const COST_32GB As Decimal = 9.99D
Dim quantity As Integer = CInt(txtQuantity.Text)
Dim cost, totalCost As Decimal
If rad16GB.Checked Then
cost = COST_16GB
Else
cost = COST_32GB
End If
Select Case quantity
Case Is < 25
totalCost = quantity * cost
Case 25 To 49
totalCost = quantity * (0.9D * cost)
Case 50 To 99
totalCost = quantity * (0.85D * cost)
Case Else
totalCost = quantity * (0.8D * cost)
End Select
txtCost.Text = totalCost.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 73 of 443)
27. Private Sub btnCompute_Click() Handles btnCompute.Click
Dim ageOnPlanet, ageInEarthDays, ageInEarthYears As Double
Dim dt As Date = CDate(mtbDayOfBirth.Text)
Dim nom As String, noResponse As Boolean = False
txtToday.Text = Today.ToString("D")
ageInEarthDays = DateDiff(DateInterval.Day, dt, Today)
ageInEarthYears = ageInEarthDays / 365.26
If radMercury.Checked Then
ageOnPlanet = ageInEarthDays / 88
nom = " Mercurian "
ElseIf radVenus.Checked Then
ageOnPlanet = ageInEarthDays / 224.7
nom = " Venusian "
ElseIf radEarth.Checked Then
ageOnPlanet = ageInEarthYears
nom = " Earth "
ElseIf radMars.Checked Then
ageOnPlanet = ageInEarthDays / 687
nom = " Martian "
ElseIf radJupiter.Checked Then
ageOnPlanet = ageInEarthYears / 11.86
nom = " Jovian "
ElseIf radSaturn.Checked Then
ageOnPlanet = ageInEarthYears / 29.46
nom = " Saturian "
ElseIf radUranus.Checked Then
ageOnPlanet = ageInEarthYears / 84.07
nom = " Uranian "
ElseIf radNeptune.Checked Then
ageOnPlanet = ageInEarthYears / 164.8
nom = " Neptunian "
Else
noResponse = True
End If
If noResponse Then
MessageBox.Show("You must select a planet.")
Else
txtAgeInDays.Text = ageOnPlanet.ToString("N1") & nom & "years"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 74 of 443)
28. Private Sub btnShow_Click(...) Handles btnShow.Click
Dim state, category As String
If radCalifornia.Checked Then
state = "CALIFORNIA"
End If
If radIndiana.Checked Then
state = "INDIANA"
End If
If radMississippi.Checked Then
state = "MISSISSIPPI"
End If
If radNewYork.Checked Then
state = "NEW YORK"
End If
If radFlower.Checked Then
category = "FLOWER"
End If
If radNickname.Checked Then
category = "NICKNAME"
End If
If radMotto.Checked Then
category = "MOTTO"
End If
Select Case state
Case "CALIFORNIA"
Select Case category
Case "FLOWER"
txtOutput.Text = "Golden poppy"
Case "NICKNAME"
txtOutput.Text = "Golden State"
Case "MOTTO"
txtOutput.Text = "Eureka"
Case Else
txtOutput.Text = "No data for category"
End Select
Case "INDIANA"
Select Case category
Case "FLOWER"
txtOutput.Text = "Peony"
Case "NICKNAME"
txtOutput.Text = "Hoosier State"
Case "MOTTO"
txtOutput.Text = "Crossroads of America"
Case Else
txtOutput.Text = "No data for category"
End Select
Case "MISSISSIPPI"
Select Case category
Case "FLOWER"
txtOutput.Text = "Magnolia"
Case "NICKNAME"
txtOutput.Text = "Magnolia State"
Case "MOTTO"
txtOutput.Text = "By valor and arms"
Case Else
txtOutput.Text = "No data for category"
End Select
Case "NEW YORK"
Select Case category
Case "FLOWER"
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 75 of 443)
txtOutput.Text = "Rose"
Case "NICKNAME"
txtOutput.Text = "Empire State"
Case "MOTTO"
txtOutput.Text = "Ever upward"
Case Else
txtOutput.Text = "No data for category"
End Select
Case Else
txtOutput.Text = "No data for state"
End Select
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 76 of 443)
29. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Compound interest
Dim intRate As Decimal 'interest per period
Dim n As Integer
'number of interest periods
If (lstRates.SelectedIndex <> -1) AndAlso
(lstCompounding.SelectedIndex <> -1) Then
Select Case lstRates.Text
Case "2%"
intRate = 0.02D
Case "2.5%"
intRate = 0.025D
Case "3%"
intRate = 0.03D
Case "3.5%"
intRate = 0.035D
Case "4%"
intRate = 0.04D
End Select
Select Case lstCompounding.Text
Case "annually"
n = 1
Case "semi-annually"
n = 2
Case "quarterly"
n = 4
Case "monthly"
n = 12
Case "weekly"
n = 52
End Select
txtAmount.Text = (10000 * (1 + intRate / n) ^ (5 * n)).ToString("C")
Else
MessageBox.Show("You must select an item from each list box.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 77 of 443)
30. 'Display "Hello" in different colors and languages
Private Sub radRed_CheckedChanged(...) Handles radRed.CheckedChanged
lblHello.ForeColor = Color.Red
End Sub
Private Sub radBlue_CheckedChanged(...) Handles radBlue.CheckedChanged
lblHello.ForeColor = Color.Blue
End Sub
Private Sub radGreen_CheckedChanged(...) Handles radGreen.CheckedChanged
lblHello.ForeColor = Color.Green
End Sub
Private Sub radEnglish_CheckedChanged(...) Handles radEnglish.CheckedChanged
lblHello.Text = "Hello"
End Sub
Private Sub radFrench_CheckedChanged(...) Handles radFrench.CheckedChanged
lblHello.Text = "Bonjour"
End Sub
Private Sub radItalian_CheckedChanged(...) Handles radItalian.CheckedChanged
lblHello.Text = "Chao"
End Sub
31. Private Sub lstProperties_SelectedIndexChanged(...) Handles _
lstProperties.SelectedIndexChanged
'Railroad properties in Monopoly
If lstProperties.Text = "Short Line" Then
MessageBox.Show("Short Line is a bus company.", "Correct")
Else
MessageBox.Show("It is an actual railroad.", "Incorrect")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 78 of 443)
32. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
If (lstPerson.SelectedIndex <> -1) AndAlso
(lstWorkplace.SelectedIndex <> -1) Then
Select Case lstPerson.Text
Case "Clark Kent"
If CStr(lstWorkplace.SelectedItem) = "Daily Planet" Then
txtAnswer.Text = "Correct"
Else
txtAnswer.Text = "Incorrect"
End If
Case "Rick Blaine"
If CStr(lstWorkplace.SelectedItem) = "Rick's American Cafe" Then
txtAnswer.Text = "Correct"
Else
txtAnswer.Text = "Incorrect"
End If
Case "Willie Wonka"
If CStr(lstWorkplace.SelectedItem) = "Chocolate Factory" Then
txtAnswer.Text = "Correct"
Else
txtAnswer.Text = "Incorrect"
End If
Case "Bruce Wayne"
If CStr(lstWorkplace.SelectedItem) = "Wayne Enterprises" Then
txtAnswer.Text = "Correct"
Else
txtAnswer.Text = "Incorrect"
End If
Case "Peter Parker"
If CStr(lstWorkplace.SelectedItem) = "Daily Bugle" Then
txtAnswer.Text = "Correct"
Else
txtAnswer.Text = "Incorrect"
End If
End Select
Else
MessageBox.Show("You must select an item from each list.", "Error")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 79 of 443)
CHAPTER 4 PROGRAMMING PROJECTS
1. Private Sub btnDisplayRates_Click(...) Handles btnDisplayRates.Click
'Display rental rates for Eddie's Equipment Rental
lstRates.Items.Clear()
lstRates.Items.Add("Price of Equipment
Half-day Full-day")
lstRates.Items.Add("1. Rug cleaner
$16.00
$24.00")
lstRates.Items.Add("2. Lawn mower
$12.00
$18.00")
lstRates.Items.Add("3. Paint sprayer
$20.00
$30.00")
End Sub
Private Sub btnDispayBill_Click(...) Handles btnDispayBill.Click
Dim num As Integer
Dim duration = "", item = ""
Dim cost As Decimal
'Display a bill for Eddie's Equipment Rental
lstBill.Items.Clear()
num = CInt(mtbItemNum.Text)
duration = mtbDuration.Text
'Compute cost depending on item and duration
Select Case num
Case 1
item = "Rug cleaner"
cost = 16
Case 2
item = "Lawn mower"
cost = 12
Case 3
item = "Paint sprayer"
cost = 20
Case Else
item = ""
MessageBox.Show("Not a valid item.")
End Select
Select Case duration
Case "H", "h"
duration = "(Half day rental)"
Case "F", "f"
duration = "(Full day rental)"
cost = cost * 1.5D
Case Else
duration = ""
MessageBox.Show("Not a valid duration.")
End Select
If (item <> "") And (duration <> "") Then
'Display the bill
lstBill.Items.Clear()
lstBill.Items.Add("Receipt from Eddie's Equipment Rental")
lstBill.Items.Add("")
lstBill.Items.Add(item & ": " & cost.ToString("C") & " " & duration)
lstBill.Items.Add("Deposit: " & (30).ToString("C")
lstBill.Items.Add("")
lstBill.Items.Add("Total: " & (cost + 30)C
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 80 of 443)
2. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim food, level As String
Dim calories, fat, pct As Double
'Determine if food meets AHA requirement for fat
'(less than 30% of calories from fat).
lstOutput.Items.Clear()
food = txtFood.Text
calories = CDbl(txtCalories.Text)
fat = CDbl(txtFat.Text)
pct = fat * (9 / calories)
lstOutput.Items.Add(food & " contains " & pct.ToString("P") &
" calories from fat")
If pct > 0.3 Then
level = "exceeds"
Else
level = "meets"
End If
lstOutput.Items.Add(level & " AHA recommendation")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 81 of 443)
3. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
Dim p, a As Decimal, n As Integer
Dim r, payment, totalInterest As Decimal
'Analyze a Mortgage
p = CDbl(txtAmount.Text)
'principal
a = CDbl(txtIntRate.Text)
'annual interest rate (e.g. 6)
n = CInt(txtduration.Text)
'duration of loan
If p <= 0 Then
MessageBox.Show("Loan amount must be greater than zero")
txtAmount.Focus()
ElseIf a <= 0 Then
MessageBox.Show("Annual interest rate must be greater than zero")
txtIntRate.Focus()
ElseIf n <= 0 Then
MessageBox.Show("Duration of loan must be greater than zero")
Else
If a < 1 Then
'Assume that the user has entered interest rate
'as a decimal value rather than a percent.
'Redisplay interest as a percentage
txtIntRate.Text = Str(100 * a)
Else
'Convert percentage to decimal value
a = a / 100
End If
r = a / 12
'monthly interest rate
payment = CDec(p * r / (1 - (1 + r) ^ (-n)))
totalInterest = n * payment - p
txtPayment.Text = payment.ToString("C")
txtTotalInt.Text = totalInterest.ToString("C")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 82 of 443)
4. Private Sub btnFind_Click(...) Handles btnFind.Click
'Determine roots of a quadratic equation
Dim a, b, c As Double
'Input coefficients to quadratic equation.
txtSolutions.Clear()
a = CDbl(txtA.Text)
b = CDbl(txtB.Text)
c = CDbl(txtC.Text)
If a = 0 Then
MessageBox.Show("Give a non-zero value for 'a'.", "Error")
txtA.Clear()
Else
Dim determinant As Double
determinant = b ^ 2 - 4 * a * c
Select Case determinant
Case Is < 0
txtSolutions.Text = "No real solutions."
Case Is = 0
txtSolutions.Text = CStr(-b / (2 * a))
Case Else
txtSolutions.Text = (-b + Math.Sqrt(determinant)) / (2 * a) &
" and " & (-b - Math.Sqrt(determinant)) / (2 * a)
End Select
End If
End Sub
5. Private Sub chkBurgers_CheckedChanged(...) Handles chkBurgers.CheckedChanged
If chkBurgers.Checked = True Then
grpBurgers.Visible = True
Else
grpBurgers.Visible = False
End If
End Sub
Private Sub chkFries_CheckedChanged(...) Handles chkFries.CheckedChanged
If chkFries.Checked = True Then
grpFries.Visible = True
Else
grpFries.Visible = False
End If
End Sub
Private Sub chkDrinks_CheckedChanged(...) Handles chkDrinks.CheckedChanged
If chkDrinks.Checked = True Then
grpDrinks.Visible = True
Else
grpDrinks.Visible = False
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 83 of 443)
Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim totalCost As Decimal
If chkBurgers.Checked Then
'Add cost of burger
If radRegular.Checked Then
totalCost += 4.19D
End If
If radCheese.Checked Then
totalCost += 4.79D
End If
If radBacon.Checked Then
totalCost += 4.79D
End If
If radBoth.Checked Then
totalCost += 5.39D
End If
End If
If chkFries.Checked Then
'Add cost of fries
If radSmall.Checked Then
totalCost += 2.39D
End If
If radMedium.Checked Then
totalCost += 3.09D
End If
If radLarge.Checked Then
totalCost += 4.99D
End If
End If
If chkDrinks.Checked Then
'Add cost of drink
If radSoda.Checked Then
totalCost += 1.69D
End If
If radWater.Checked Then
totalCost += 1.49D
End If
End If
txtCost.Text = totalCost.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 84 of 443)
6. Private Sub txtGPA_Leave(...) Handles txtGPA.Leave
txtGPAPoints.Text = "[" & Str(20 * CDbl(txtGPA.Text)) & "]"
End Sub
Private Sub btnCalculate_Click(...s) Handles btnCalculate.Click
'Calculate an applicants score based on the criteria shown in the form
'Display the score and whether student is admitted
Dim sumOfTopHalf, sumOfBottomHalf As Double
Dim gpaPoints, satPoints, hsQualityPoints, curriculumPoints As Double
gpaPoints = 20 * CDbl(txtGPA.Text)
'Calculate satPoints
If radSAT930.Checked Then
satPoints = 6
ElseIf radSAT1010.Checked Then
satPoints = 10
ElseIf radSAT1200.Checked Then
satPoints = 11
ElseIf radSAT1360.Checked Then
satPoints = 12
Else
satPoints = 0
End If
'Calculate hsQualityPoints
If radHS1.Checked Then
hsQualityPoints = 2
ElseIf radHS2.Checked Then
hsQualityPoints = 4
ElseIf radHS3.Checked Then
hsQualityPoints = 6
ElseIf radHS4.Checked Then
hsQualityPoints = 8
ElseIf radHS5.Checked Then
hsQualityPoints = 10
Else
hsQualityPoints = 0
End If
'Calculate curriculumPoints
If radCurNeg2.Checked Then
curriculumPoints = -4
ElseIf radCurNeg1.Checked Then
curriculumPoints = -2
ElseIf radCur1.Checked Then
curriculumPoints = 2
ElseIf radCur2.Checked Then
curriculumPoints = 4
ElseIf radCur3.Checked Then
curriculumPoints = 6
ElseIf radCur4.Checked Then
curriculumPoints = 8
Else
curriculumPoints = 0
End If
sumOfTopHalf = gpaPoints + satPoints + hsQualityPoints + curriculumPoints
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 85 of 443)
'Now for bottom half
Dim geographyPoints, alumniPoints, essayPoints, leadershipPoints,
miscPoints As Double
'Calculate geographyPoints
Dim geoTotal As Integer
geoTotal = 0
If chkGeoStateRes.Checked Then
geoTotal = geoTotal + 10
End If
If chkGeoUnderCounty.Checked Then
geoTotal = geoTotal + 6
End If
If chkGeoUnderState.Checked Then
geoTotal = geoTotal + 2
End If
geographyPoints = geoTotal
'Calculate alumniPoints
If chkAlumLegacy.Checked Then
alumniPoints = 4
End If
If chkAlumOther.Checked Then
alumniPoints += 1
End If
'Calculate essayPoints
If radEssayVG.Checked Then
essayPoints = 1
ElseIf radEssayE.Checked Then
essayPoints = 2
ElseIf radEssayO.Checked Then
essayPoints = 3
Else
essayPoints = 0
End If
'Calculate leadershipPoints
leadershipPoints = 0
If chkLeaderState.Checked Then
leadershipPoints += 1
End If
If chkLeaderRegional.Checked Then
leadershipPoints += 2
End If
If chkLeaderNational.Checked Then
leadershipPoints += 5
End If
'Calculate miscPoints
If radMiscSocDisadv.Checked Or radMiscAthlete.Checked Or
radMiscDiscretion.Checked Then
miscPoints = 20
ElseIf radMiscMaleNurse.Checked Then
miscPoints = 5
Else
miscPoints = 0
End If
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 86 of 443)
'Calculate the number of points for the bottom half; number at most 40
Dim bottomTotal As Double = geographyPoints + alumniPoints + essayPoints +
leadershipPoints + miscPoints
If bottomTotal < 40 Then
sumOfBottomHalf = bottomTotal
Else
sumOfBottomHalf = 40
End If
Dim score As Double = sumOfTopHalf + sumOfBottomHalf
lstResults.Items.Clear()
lstResults.Items.Add("Total Score: " & score)
lstResults.Items.Add("")
If (score >= 100) Then
lstResults.Items.Add("Admitted")
Else
lstResults.Items.Add("Rejected")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 87 of 443)
CHAPTER 5
EXERCISES 5.1
1. 59
2. You can park about 500 cars.
3. The population will double in 24 years.
5. 27 is an odd number.
8. 15
5
6. Dec
9. age before beauty
4. 3
7. Your state income tax is $150.00.
10. A average
11. The function header should end with "As String", not "As Integer".
12. "len =" should not appear in the Return statement. The last line inside
the Function procedure should be Return 2 * w.Length.
13. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
radius = CDbl(txtRadius.Text)
height = CDbl(txtHeight.Text)
txtAmount.Text = TinArea(radius, height) & " square centimeters"
End Sub
Function TinArea(radius As Double, ht As Double) As Double
'Calculate surface area of a cylindrical can.
Return 6.283 * (radius ^ 2 + radius * ht)
End Function
14. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim weight As Double = CDbl(txtWeight.Text)
Dim height As Double = CDbl(txtHeight.Text)
txtBMI.Text = CStr(BMI(weight, height))
End Sub
Function BMI(w As Double, h As Double) As Double
Return Math.Round((703 * w) / (h ^ 2))
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 88 of 443)
15. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim speed As Double = CDbl(txtSpeed.Text)
If Category(speed) = "" Then
txtOutcome.Text = "Not a hurricane."
Else
txtOutcome.Text = "Category " & Category(speed) & " hurricane."
End If
End Sub
Function Category(speed As Double) As String
If speed < 74 Then
Return ""
ElseIf speed <= 95 Then
Return "One"
ElseIf speed <= 110 Then
Return "Two"
ElseIf speed <= 130 Then
Return "Three"
ElseIf speed <= 155 Then
Return "Four"
Else
Return "Five"
End If
End Function
16. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Calculate exercise heart rate
Dim age As Integer, restRate As Double
age = CInt(txtAge.Text)
restRate = CDbl(txtRestHR.Text)
txtTHR.Text = CStr(THR(age, restRate))
End Sub
Function THR(age As Integer, restRate As Double) As Double
Return (((220 - age) - restRate) * 0.6) + restRate
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 89 of 443)
17. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim popcorn, butter, bucket, price As Decimal 'amount in dollars
popcorn = CDec(txtPopcorn.Text)
bucket = CDec(txtBucket.Text)
butter = CDec(txtButter.Text)
price = CDec(txtPrice.Text)
txtProfit.Text = (Profit(popcorn, butter, bucket, price)).ToString("C")
End Sub
Function Profit(popcorn As Decimal, butter As Decimal ,
bucket As Decimal, price As Decimal) As Decimal
'Calculate the profit on a bucket of popcorn
Return price - (popcorn + butter + bucket)
End Function
18. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim midterm, final As Double
midterm = CDbl(txtMidTerm.Text)
final = CDbl(txtFinal.Text)
txtSemesterGrade.Text = SemesterGrade(midterm, final)
End Sub
Function SemesterGrade(midTerm As Double, final As Double) As String
Dim score As Double = (midTerm + 2 * final) / 3
score = Ceil(score)
Select Case score
Case Is >= 90
Return "A"
Case Is >= 80
Return "B"
Case Is >= 70
Return "C"
Case Is >= 60
Return "D"
Case Else
Return "F"
End Select
End Function
Function Ceil(num As Double) As Double
Return -Int(-num)
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 90 of 443)
19. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim weight As Double
weight = CDbl(txtWeight.Text)
txtOutput.Text = (Cost(weight)).ToString("C")
End Sub
Function Ceil(x As Double) As Double
Return -Int(-x)
End Function
Function Cost(weight As Double) As Double
Return 0.05 + 0.1 * Ceil(weight - 1)
End Function
20. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim x, y, z As Double
x = CDbl(txtNum1.Text)
y = CDbl(txtNum2.Text)
z = CDbl(txtNum3.Text)
txtAverage.Text = CStr(Average(x, y, z))
End Sub
Function Average(x As Double, y As Double, z As Double) As Double
Return ((x + y + z) / 3)
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 91 of 443)
21. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim x, y, z As Double
x = CDbl(txtNum1.Text)
y = CDbl(txtNum2.Text)
z = CDbl(txtNum3.Text)
txtMaximum.Text = CStr(Maximum(x, y, z))
End Sub
Function Maximum(x As Double, y As Double, z As Double) As Double
Dim max As Double
max = x
If y > max Then
max = y
End If
If z > max Then
max = z
End If
Return max
End Function
22. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim x, y, z As Double
x = CDbl(txtNum1.Text)
y = CDbl(txtNum2.Text)
z = CDbl(txtNum3.Text)
txtMinimum.Text = CStr(Minimum(x, y, z))
End Sub
Function Minimum(x As Double, y As Double, z As Double) As Double
Dim min As Double
min = x
If y < min Then
min = y
End If
If z < min Then
min = z
End If
Return min
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 92 of 443)
23. Private Sub btnAddressNGreet_Click(...) Handles btnAddressNGreet.Click
Dim name As String
name = txtName.Text
lstOutput.Items.Add("The Honorable " & name)
lstOutput.Items.Add("United States Senate")
lstOutput.Items.Add("Washington, DC 20001")
lstOutput.Items.Add("")
lstOutput.Items.Add("Dear Senator " & LastName(name) & ",")
End Sub
Function LastName(name As String) As String
Dim spacePos As Integer
spacePos = name.IndexOf(" ")
Return name.Substring(spacePos + 1)
End Function
24. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display monthly savings account balances.
Dim balance, amt As Decimal
lstBalance.Items.Clear()
amt = CDec(txtAmount.Text)
balance = amt
lstBalance.Items.Add("Month 1: " & balance.ToString("C"))
balance = NewBalance(balance, amt)
lstBalance.Items.Add("Month 2: " & balance.ToString("C"))
balance = NewBalance(balance, amt)
lstBalance.Items.Add("Month 3: " & balance.ToString("C"))
balance = NewBalance(balance, amt)
lstBalance.Items.Add("Month 4: " & balance.ToString("C"))
End Sub
Function NewBalance(oldBal As Decimal, amt As Decimal) As Decimal
'Compute the monthly balance in a 6% interest acct. w/ amt added ea. mo.
Return (1.005D * oldBal) + amt
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 93 of 443)
25. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
If IsLeapYear(CInt(mtbYear.Text)) Then
'mask is 0000
txtOutput.Text = mtbYear.Text & " is a leap year."
Else
txtOutput.Text = mtbYear.Text & " is not a leap year."
End If
End Sub
Function IsLeapYear(yr As Integer) As Boolean
Dim date1 As Date = CDate("#1/1/" & yr & "#")
Dim date2 As Date = CDate("#1/1/" & (yr + 1) & "#")
If DateDiff(DateInterval.Day, date1, date2) = 366 Then
Return True
Else
Return False
End If
End Function
26. Private Sub btnDisplay_Click(...) Handles btnDetermine.Click
Dim d As Date = CDate(mtbDate.Text)
txtOutput.Text = DayOfWeek(d)
End Sub
Function DayOfWeek(d As Date) As String
Dim str As String = FormatDateTime(d, DateFormat.LongDate)
Dim n As Integer = str.IndexOf(","c)
Return str.Substring(0, n)
End Function
27. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'College tuition
Dim resident As Boolean = False, undergraduate As Boolean = False
Dim numCredits As Integer
If IsNumeric(txtNumCredits.Text) Then
numCredits = CInt(txtNumCredits.Text)
If radYes.Checked Then
resident = True
End If
If radUndergraduate.Checked Then
undergraduate = True
End If
txtTuition.Text = (CalculateTuition(numCredits, resident,
undergraduate)).ToString("C")
Else
MessageBox.Show("You must enter the number of credits.", "Missing Input")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 94 of 443)
Function CalculateCostPerCredit(resident As Boolean,
undergraduate As Boolean) As Decimal
If resident Then
If undergraduate Then
Return 90
Else
Return 110
End If
Else
If undergraduate Then
Return 150
Else
Return 180
End If
End If
End Function
Function CalculateTuition(numCredits As Integer, resident As Boolean,
undergraduate As Boolean) As Decimal
Return numCredits * CalculateCostPerCredit(resident, undergraduate)
End Function
28. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Determine cost to rent a cabin
Dim resident As Boolean, numDays As Integer
If radYes.Checked Then
resident = True
ElseIf radNo.Checked = True Then
resident = False
Else
MessageBox.Show("You must select one of the radio buttons.")
End If
numDays = CInt(txtNumDays.Text)
txtCost.Text = (CalculateCost(resident, numDays)).ToString("C")
End Sub
Function CalculateCost(resident As Boolean, numDays As Integer) As Decimal
Dim cost As Decimal
If resident Then
If numDays <= 6 Then
cost = 65 * numDays
Else
cost = (65 * 6) + (50 * (numDays - 6))
End If
End If
If Not resident Then
cost = 75 * numDays
End If
Return cost
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 95 of 443)
29. Function Embed(strVar1 As String, strVar2 As String, n As Integer) As String
If (n < 0) OrElse (n > strVar1.Length) Then
MessageBox.Show("Task cannot be completed.")
Exit Function
End If
Dim strVar3 As String = strVar1.Substring(0, n)
Dim strVar4 As String = strVar1.Substring(n)
Return strVar3 & strVar2 & strVar4
End Function
30. Function Eliminate(strVar As String, n As Integer, m As Integer) As String
If (n < 0) OrElse (m < 0) OrElse ((m + n) > strVar.Length) Then
MessageBox.Show("Task cannot be completed.")
Exit Function
End If
Dim strVar1 As String = strVar.Substring(0, n)
Dim strVar2 As String = strVar.Substring(m + n)
Return strVar1 & strVar2
End Function
EXERCISES 5.2
1. 88 keys on a piano
2. Call me Ishmael.
3. You look dashing in blue.
4. 144 items in a gross
5. 1440 minutes in a day
6. The number of U.S. Senators is 100
7. Why do clocks run clockwise?
Because they were invented in the northern
hemisphere where sundials go clockwise.
8. The answer is 9W.
What is the question?
Do you spell your name with a V,
Mr. Wagner?
9. It was the best of times.
It was the worst of times.
11. divorced
beheaded
died
divorced
beheaded
survived
13. 24 blackbirds
baked in
a pie.
10. 168 hours in a week
76 trombones in the big parade
12. President Bush is a graduate of Yale.
President Obama is a graduate of Columbia.
14. Keep cool, but don't freeze.
Source: A jar of mayonnaise.
15. The first 6 letters are Visual.
16. Answers will vary.
17. Cost: $250.00
Shipping cost: $15.00
Total cost: $265.00
18. Visual Basic
19. You passed with ©a2017
grade
of 92.
20. twentieth century
Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 96 of 443)
21. There is a parameter in the Sub procedure, but no argument in the statement calling the Sub
procedure.
22. The arguments of the Sub procedure call are out of order. The Double variable number
should be first, since the Double parameter in the Sub procedure header is first.
23. Since Handles is a keyword, it cannot be used as the name of a Sub procedure.
24. The Sub procedure Tea() declaration has no parameter to match the argument num in the
calling statement.
25. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim num As Integer = 7
Lucky(num)
End Sub
Sub Lucky(num As Integer)
txtOutput.Text = num & " is a lucky number."
End Sub
26. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Greet a friend
Dim name As String = "Jack"
Greet(name)
End Sub
Sub Greet(name As String)
'Display greeting
txtOutput.Text = "Hi, " & name
End Sub
27. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Tallest("redwood", 362)
Tallest("pine", 223)
End Sub
Sub Tallest(tree As String, ht As Double)
lstBox.Items.Add("The tallest " & tree &
" tree in the U.S. is " & ht & " feet.")
End Sub
28. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display information about cities.
lstOutput.Items.Clear
DisplayData("San Jose", 81349)
DisplayData("Hartford", 28931)
End Sub
Sub DisplayData(city As String, householdIncome As Decimal)
'Display city information
lstOutput.Items.Add("In 2012, the average salary for " &
city & " was " & householdIncome.ToString("C0") & ".")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 97 of 443)
29. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
DisplayHeader()
Majors(0.146, "business")
Majors(0.035, "computer science")
End Sub
Sub DisplayHeader()
Dim phrase As String
phrase = "Intended majors of freshmen in 2014:"
lstOutput.Items.Add(phrase)
End Sub
Sub Majors(percentOfStudents As Double, field As String)
'Display the information about the major
lstOutput.Items.Add(field & ": " & percentOfStudents.ToString("P"))
End Sub
30. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim dt As Date = CDate(mtbDOB.Text)
lstOutput.Items.Clear()
AgeInYears(dt)
AgeInDays(dt)
End Sub
Sub AgeInYears(dt As Date)
'DateDiff(DateInterval.Year, d1, d2) uses only the year
'parts of the two dates in its computation.
Dim numYears As Integer = CInt(DateDiff(DateInterval.Year, dt1, dt2))
If dt1.AddYears(numYears) > dt2 Then
numYears = numYears - 1
End If
lstOutput.Items.Add("You are " & numYears & " years old.")
End Sub
Sub AgeInDays(dt As Date)
Dim numDays As Double = DateDiff(DateInterval.Day, dt, Today)
lstOutput.Items.Add("You are " & numDays.ToString("N0") & " days old.")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 98 of 443)
31. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Favorite number
Dim num As Double
lstOutput.Items.Clear()
num = CDbl(txtBox.Text)
Sum(num)
Product(num)
End Sub
Sub Sum(num As Double)
Dim phrase As String
phrase = "Sum of favorite number with itself: "
lstOutput.Items.Add(phrase & (num + num))
End Sub
Sub Product(num As Double)
Dim phrase As String
phrase = "Product of favorite number with itself: "
lstOutput.Items.Add(phrase & (num * num))
End Sub
32. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Enrollments in course
lstOutput.Items.Clear()
lstOutput.Items.Add("In a recent year,")
ShowEnrolled(823, "Spanish")
ShowEnrolled(206, "French")
End Sub
Sub ShowEnrolled(students As Double, course As String)
'Display enrollment and course
lstOutput.Items.Add(students & " thousand students took a " &
course & " course.")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 99 of 443)
33. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
ShowVerse("lamb", "baa")
ShowVerse("duck", "quack")
ShowVerse("firefly", "blink")
End Sub
Sub ShowVerse(animal As String, sound As String)
'Display a verse from Old McDonald Had a Farm
lstOutput.Items.Add("Old McDonald had a farm. Eyi eyi oh.")
lstOutput.Items.Add("And on his farm he had a " & animal &
". Eyi eyi oh.")
lstOutput.Items.Add("With a " & sound & " " & sound & " here, and a " &
sound & " " & sound & " there.")
lstOutput.Items.Add("Here a " & sound & ", there a " & sound &
", everywhere a " & sound & " " & sound & ".")
lstOutput.Items.Add("Old McDonald had a farm. Eyi eyi oh.")
lstOutput.Items.Add("")
End Sub
34. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim occupation As String, amount As Decimal, percent As Decimal
occupation = txtOccupation.Text
amount = CDec(txtAmount.Text)
percent = CDec(txtPercent.Text)
DisplayOutput(occupation, amount, percent)
End Sub
Sub DisplayOutput(occupation As String, amount As Decimal,
percent As Decimal)
Dim tip As Decimal
tip = amount * 0.01D * percent
txtOutput.Text = "Tip the " & occupation & " " & tip.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 100 of 443)
35. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim grade1 As Double = CDbl(txtGrade1.Text)
Dim grade2 As Double = CDbl(txtGrade2.Text)
Dim grade3 As Double = CDbl(txtGrade3.Text)
DisplayHighestTwo(grade1, grade2, grade3)
End Sub
Sub DisplayHighestTwo(grade1 As Double, grade2 As Double,
grade3 As Double)
Dim first, second As Double
first = Max(grade1, grade2)
If first = grade1 Then
second = Max(grade2, grade3)
Else
second = Max(grade1, grade3)
End If
txtOutput.Text = "The highest two grades are " & first &
" and " & second & "."
End Sub
Function Max(num1 As Double, num2 As Double) As Double
If num1 <= num2 Then
Return num2
Else
Return num1
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 101 of 443)
36. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim fullName = txtName.Text
Dim grade1 = CDbl(txtGrade1.Text)
Dim grade2 = CDbl(txtGrade2.Text)
Dim grade3 = CDbl(txtGrade3.Text)
DisplayGrade(fullName, grade1, grade2, grade3)
End Sub
Sub DisplayGrade(fullName As String, num1 As Double,
num2 As Double, num3 As Double)
txtOutput.Text = fullName & ": " & SemesterGrade(num1, num2, num3)
End Sub
Function SemesterGrade(num1 As Double, num2 As Double,
num3 As Double) As String
Dim average As Double
If (num1 <= num2) And (num1 <= num3) Then
average = Math.Round((num2 + num3) / 2)
ElseIf (num2 <= num1) And (num2 <= num3) Then
average = Math.Round((num1 + num3) / 2)
Else
average = Math.Round((num1 + num2) / 2)
End If
If average >= 90 Then
Return "A"
ElseIf average >= 80 Then
Return "B"
ElseIf average >= 70 Then
Return "C"
ElseIf average >= 60 Then
Return "D"
Else
Return "F"
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 102 of 443)
37. Private Sub btnAlphabetize_Click(...) Handles btnAlphabetize.Click
Dim word1 = txtWord1.Text
Dim word2 = txtWord2.Text
DisplayWords(word1, word2)
End Sub
Sub DisplayWords(word1 As String, word2 As String)
Dim first, second As String
If word1 <= word2 Then
first = word1
second = word2
Else
first = word2
second = word1
End If
lstOutput.Items.Add(first)
lstOutput.Items.Add(second)
End Sub
38. Private Sub btnDisplay_Click() Handles btnDisplay.Click
HappyBirthday(txtName.Text)
End Sub
Sub HappyBirthday(name As String)
lstSong.Items.Add("Happy birthday to you!")
lstSong.Items.Add("Happy birthday to you!")
lstSong.Items.Add("Happy birthday, dear " & name & ".")
lstSong.Items.Add("Happy birthday to you!")
End Sub
39. Sub ShowCentury(anyDate As Date)
If anyDate >= Today Then
MessageBox.Show("You did not enter a past date.")
Exit Sub
End If
Select Case anyDate
Case Is >= #1/1/2000#
txtOutput.Text = "twenty-first century"
Case Is >= #1/1/1900#
txtOutput.Text = "twentieth century"
Case Else
txtOutput.Text = "prior to the twentieth century"
End Select
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 103 of 443)
40. Sub ShowParity(numString As String)
If Not IsNumeric(numString) Then
MessageBox.Show("You did not enter a number.")
Exit Sub
End If
txtOutput.Text = numString
Select Case (CInt(numString) Mod 2)
Case 0
txtOutput.Text &= " rounds to an even number."
Case 1, -1
txtOutput.Text &= " rounds to an odd number."
End Select
End Sub
EXERCISES 5.3
1. Gabriel was born in the year 1980.
2. The population of the United States is about 315,000,000.
3. The state flower of Alaska is the Forget Me Not.
4. The Artist won the award in 2012.
5. The first 3 letters of EDUCATION are EDU.
6. Original price: $126
Cost: $106
7. sum = 4
difference = 2
8. sales tax: $12.00
profit: $90.00
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 104 of 443)
9.
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim firstName As String = ""
Dim lastName As String = ""
Dim salary, newSalary As Decimal
InputData(firstName, lastName, salary)
newSalary = RaisedSalary(salary)
DisplayOutput(firstName, lastName, newSalary)
End Sub
Sub InputData(ByRef firstName As String, ByRef lastName As String,
ByRef salary As Decimal)
firstName = txtFirstName.Text
lastName = txtLastName.Text
salary = CDec(txtCurrentSalary.Text)
End Sub
Function RaisedSalary(salary As Decimal) As Decimal
If salary <= 40000 Then
Return 1.05D * salary
Else
Return salary + 2000 + 0.02D * (salary - 40000)
End If
End Function
Sub DisplayOutput(firstName As String, lastName As String,
newSalary As Decimal)
txtOutput.Text = "New salary for " & firstName & " " & lastName &
" is " & newSalary.ToString("C") & "."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 105 of 443)
10. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim oldBalance, charges, credits, newBalance, minPayment As Decimal
InputData(oldBalance, charges, credits)
CalculateNewValues(oldBalance, charges, credits, newBalance, minPayment)
DisplayData(newBalance, minPayment)
End Sub
Sub InputData(ByRef oldBalance As Decimal, ByRef charges As Decimal,
ByRef credits As Decimal)
oldBalance = CDec(txtOldBal.Text)
charges = CDec(txtCharges.Text)
credits = CDec(txtCredits.Text)
End Sub
Sub CalculateNewValues(oldBalance As Decimal, charges As Decimal,
credits As Decimal, ByRef newBalance As Decimal,
ByRef minPayment As Decimal)
newBalance = CDec(1.015 * oldBalance + charges - credits)
If newBalance <= 20 Then
minPayment = newBalance
Else
minPayment = CDec(20 + 0.1 * (newBalance - 20))
End If
End Sub
Sub DisplayData(newBalance As Decimal, minPayment As Decimal)
txtNewBal.Text = newBalance.ToString("C")
txtMinPayment.Text = minPayment.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 106 of 443)
11. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim annualRateOfInterest, monthlyPayment, begBalance As Decimal
Dim intForMonth, redOfPrincipal, endBalance As Decimal
InputData(annualRateOfInterest, monthlyPayment, begBalance)
Calculate(annualRateOfInterest, monthlyPayment, begBalance,
intForMonth, redOfPrincipal, endBalance)
DisplayData(intForMonth, redOfPrincipal, endBalance)
End Sub
Sub InputData(ByRef annualRateOfInterest As Decimal,
ByRef monthlyPayment As Decimal,
ByRef begBalance As Decimal)
annualRateOfInterest = CDec(txtAnnualRateOfInterest.Text)
monthlyPayment = CDec(txtMonthlyPayment.Text)
begBalance = CDec(txtBegBalance.Text)
End Sub
Sub Calculate(annualRateOfInterest As Decimal, monthlyPayment As Decimal,
begBalance As Decimal, ByRef intForMonth As Decimal,
ByRef redOfPrincipal As Decimal, ByRef endBalance As Decimal)
Dim monthlyRateOfInterest As Decimal = annualRateOfInterest / 12
intForMonth = (monthlyRateOfInterest / 100) * begBalance
redOfPrincipal = monthlyPayment - intForMonth
endBalance = begBalance - redOfPrincipal
End Sub
Sub DisplayData(intForMonth As Decimal, redOfPrincipal As Decimal,
endBalance As Decimal)
txtIntForMonth.Text = intForMonth.ToString("C")
txtRedOfPrincipal.Text = redOfPrincipal.ToString("C")
txtEndBalance.Text = endBalance.ToString("C")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 107 of 443)
12. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim hours, payPerHour, overtimeHours, pay As Decimal
InputData(hours, payPerHour)
CalculateValues(hours, payPerHour, overtimeHours, pay)
DisplayData(overtimeHours, pay)
End Sub
Sub InputData(ByRef hours As Decimal, ByRef payPerHour As Decimal)
hours = CDec(txtHours.Text)
payPerHour = CDec(txtPayPerHour.Text)
End Sub
Sub CalculateValues(hours As Decimal, payPerHour As Decimal,
ByRef overtimeHours As Decimal, ByRef pay As Decimal)
If hours <= 40 Then
overtimeHours = 0
pay = hours * payPerHour
Else
overtimeHours = hours - 40
pay = (40 * payPerHour) + (1.5D * payPerHour * overtimeHours)
End If
End Sub
Sub DisplayData(overtimeHours As Decimal, pay As Decimal)
txtOvertimeHrs.Text = CStr(overtimeHours)
txtPay.Text = pay.ToString("C")
End Sub
13. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Sort three numbers
Dim first As Double = CDbl(txtNum1.Text)
Dim second As Double = CDbl(txtNum2.Text)
Dim third As Double = CDbl(txtNum3.Text)
Sort(first, second, third)
txtMax.Text = CStr(first)
txtMiddle.Text = CStr(second)
txtMin.Text = CStr(third)
End Sub
Sub Sort(ByRef first As Double, ByRef second As Double, ByRef third As Double)
Dim max As Double
'Find greatest value
max = first
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 108 of 443)
If second > max Then
max = second
End If
If third > max Then
max = third
End If
'Store maximum value in variable first
If second = max Then
Swap(first, second)
ElseIf third = max Then
Swap(first, third)
End If
'Order remaining two values
If third > second Then
Swap(second, third)
End If
End Sub
Sub Swap(ByRef x As Double, ByRef y As Double)
Dim temp As Double
temp = x
x = y
y = temp
End Sub
14. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim firstNumber, secondNumber As Integer
firstNumber = 4
secondNumber = Treble(firstNumber)
txtResult.Text = CStr(secondNumber)
End Sub
Function Treble(firstNumber As Integer) As Integer
Return 3 * firstNumber
End Function
15. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim price, salesTaxRate, cost As Decimal
price = 29.95D
salesTaxRate = 0.05D
cost = FindCost(price, salesTaxRate)
txtResult.Text = cost.ToString("C")
End Sub
Function FindCost(price As Decimal, salesTaxRate As Decimal) As Decimal
Return price * (1 + salesTaxRate)
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 109 of 443)
CHAPTER 5 PROGRAMMING PROJECTS
1. Dim total As Double
Dim numCredits As Integer
Private Sub btnRecord_Click(...) Handles btnRecord.Click
total += QualityPoints()
numCredits += CInt(mtbCredits.Text)
mtbGrade.Clear()
mtbCredits.Clear()
mtbGrade.Focus()
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
txtGPA.Text = (total / numCredits).ToString("N1")
End Sub
Function QualityPoints() As Integer
Dim numericGrade As Integer
Dim credits As Integer = CInt(mtbCredits.Text)
Dim qualPoints As Integer
Select Case mtbGrade.Text
Case "A"
numericGrade = 4
Case "B"
numericGrade = 3
Case "C"
numericGrade = 2
Case "D"
numericGrade = 1
Case Else
numericGrade = 0
End Select
qualPoints = numericGrade * credits
Return qualPoints
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 110 of 443)
2. Const PIZZA_PRICE As Decimal = 1.75D
Const FRIES_PRICE As Decimal = 2
Const DRINKS_PRICE As Decimal = 1.25D
Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Compute a customer's bill
Dim pizzaSlices As Double, fries As Double, softDrinks As Double
lstOutput.Items.Clear()
InputData(pizzaSlices, fries, softDrinks)
DisplayBill(pizzaSlices, fries, softDrinks)
End Sub
Sub DisplayBill(pizzaSlices As Double, fries As Double,
softDrinks As Double)
'Display an itemized bill
Dim total As Double
total = TotalCost(pizzaSlices, fries, softDrinks)
lstOutput.Items.Add("ITEM" & "
" & "QUANTITY" & "
" & "PRICE")
lstOutput.Items.Add("pizza slices" & "
" & pizzaSlices &
"
" & (PIZZA_PRICE * pizzaSlices).ToString("C"))
lstOutput.Items.Add("fries" & "
" & fries &
"
" & (FRIES_PRICE * fries).ToString("C"))
lstOutput.Items.Add("soft drinks" & "
" & softDrinks &
"
" & (DRINKS_PRICE * softDrinks).ToString("C"))
lstOutput.Items.Add("TOTAL" & "
" & total.ToString("C"))
End Sub
Sub InputData(ByRef pizzaSlices As Double, ByRef fries As Double,
ByRef softDrinks As Double)
'Input items
pizzaSlices = CDbl(txtPizza.Text)
fries = CDbl(txtFries.Text)
softDrinks = CDbl(txtDrinks.Text)
End Sub
Function TotalCost(pizzaSlices As Double,
fries As Double, softDrinks As Double) As Double
Return (PIZZA_PRICE * pizzaSlices) + (FRIES_PRICE * fries) +
(DRINKS_PRICE * softDrinks)
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 111 of 443)
3. Const COST_PER_CHAIR As Decimal = 350
Const COST_PER_SOFA As Decimal = 925
Const SALES_TAX_RATE As Decimal = 0.05D
Private Sub bntProcess_Click(...) Handles bntProcess.Click
Dim cost As Double
Dim totalCost As Double
'cost + sales tax
cost = COST_PER_CHAIR * CDbl(txtChairs.Text) +
COST_PER_SOFA * CDbl(txtSofas.Text)
totalCost = cost + SALES_TAX_RATE * cost
lstInvoice.Items.Clear()
lstInvoice.Items.Add("Invoice Number: " & InvoiceNumber())
lstInvoice.Items.Add("")
lstInvoice.Items.Add("Name: " & NameInProperOrder())
lstInvoice.Items.Add("Address: " & txtAddress.Text)
lstInvoice.Items.Add("City: " & txtCityState.Text)
lstInvoice.Items.Add("")
lstInvoice.Items.Add("Number of Chairs: " & txtChairs.Text)
lstInvoice.Items.Add("Number of Sofas: " & txtSofas.Text)
lstInvoice.Items.Add("")
lstInvoice.Items.Add("
Cost:" & "
" & cost.ToString("C")))
lstInvoice.Items.Add("Sales Tax:" & "
" &
(SALES_TAX_RATE * cost).ToString("C"))
lstInvoice.Items.Add("
------------")
lstInvoice.Items.Add("Total Cost:" & " " & totalCost.ToString("C"))
End Sub
Private Sub btnClear_Click(...) Handles btnClear.Click
txtName.Text = ""
txtAddress.Text = ""
txtCityState.Text = ""
txtChairs.Text = ""
txtSofas.Text = ""
txtName.Focus()
lstInvoice.Items.Clear()
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
Me.Close()
End Sub
Private Function InvoiceNumber() As String
Dim endOfZip, str As String
endOfZip = txtCityState.Text.Substring(txtCityState.Text.Length - 4)
str = txtName.Text.Substring(0, 2).ToUpper & endOfZip
Return str
End Function
Private Function NameInProperOrder() As String
Dim name, firstName, lastName As String
Dim comma As Integer
name = txtName.Text
comma = name.IndexOf(",")
lastName = name.Substring(0, comma)
firstName = name.Substring(comma + 2)
Return firstName & " " & lastName
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 112 of 443)
4. Dim numCorrect As Integer
Private Sub btnTakeQuiz_Click(...) Handles btnTakeQuiz.Click
'Test user's appraisals of common sayings
numCorrect = 0
'Number of correct answers
GiveTest(1)
GiveTest(2)
GiveTest(3)
GiveTest(4)
GiveTest(5)
GiveTest(6)
GiveTest(7)
ShowMessage()
End Sub
Sub GiveTest(numProverb As Integer)
'Administer test and count correct replies
Dim saying As String = ""
Dim answer As String = ""
Dim reply, question As String
GetProverb(numProverb, saying, answer)
question = "(" & numProverb & ") " & saying & " (T/F)"
reply = InputBox(question)
If reply.ToUpper = answer Then
MessageBox.Show("You're right.", "Question " & numProverb)
numCorrect += 1
Else
MessageBox.Show("I'm sorry. You're wrong.", "Question " & numProverb)
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 113 of 443)
Sub GetProverb(which As Integer, ByRef proverb As String,
ByRef truthVal As String)
Select Case which
Case 1
proverb = "The squeaky wheel gets the grease."
truthVal = "T"
Case 2
proverb = "Giving is better than receiving."
truthVal = "T"
Case 3
proverb = "Opposites attract."
truthVal = "F"
Case 4
proverb = "Spare the rod and spoil the child."
truthVal = "F"
Case 5
proverb = "Actions speak louder than words."
truthVal = "T"
Case 6
proverb = "Flattery will get you nowhere."
truthVal = "F"
Case 7
proverb = "Marry in haste, repent at leisure."
truthVal = "T"
End Select
End Sub
Sub ShowMessage()
'Comment on user's performance
Select Case numCorrect
Case 7
MessageBox.Show("Perfect. " & numCorrect & " correct")
Case 5, 6
MessageBox.Show("Excellent. " & numCorrect & " correct")
Case Else
MessageBox.Show("You might consider taking Psychology 101.
numCorrect & " correct")
End Select
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
" &
Instructor Solutions Manual (Page 114 of 443)
5. Dim sticksRemaining As Integer
Dim sticks As String
Private Sub btnRules_Click(...) Handles btnRules.Click
Dim message As String
message = "You begin by deciding how many matchsticks (between 5 and 50) " &
"to place on the pile. Then I will decide who goes first. At each turn, " &
"a contestant must take 1, 2, or 3 matchsticks from the pile. " &
"The one who takes the last matchstick loses."
MessageBox.Show(message, "Rules of the Game")
End Sub
Private Sub btnBegin_Click(...) Handles btnBegin.Click
Dim message As String
sticks = "||||||||||||||||||||||||||||||||||||||||||||||||||"
message = "How many matchsticks would you like to begin with? " &
"Pick a number from 5 to 50."
sticksRemaining = CInt(InputBox(message, "Begin the Game"))
txtStatus.Text = sticks.Substring(0, sticksRemaining)
If sticksRemaining Mod 4 = 1 Then
MessageBox.Show("I have decided that you should go first.", "Whose Turn")
Else
MessageBox.Show("I have decided to go first.", "Whose Turn")
ComputerTurn()
End If
End Sub
Private Sub btnPickUpOne_Click(...) Handles btnPickUpOne.Click
YourTurn(1)
End Sub
Private Sub btnPickUpTwo_Click(...) Handles btnPickUpTwo.Click
YourTurn(2)
End Sub
Private Sub btnPickUpThree_Click(...) Handles btnPickUpThree.Click
YourTurn(3)
End Sub
(continued on next page)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 115 of 443)
Private Sub ComputerTurn()
Dim myPick As Integer
Dim sticksRemMod4 As Integer
sticksRemMod4 = sticksRemaining Mod 4
Select Case sticksRemMod4
Case 0
myPick = 3
Case 2
myPick = 1
Case 3
myPick = 2
End Select
sticksRemaining = sticksRemaining - myPick
If sticksRemaining = 1 Then
MessageBox.Show("I select " & myPick &
" matchsticks. " & "I win.", "Hooray")
Else
MessageBox.Show("I select " & myPick & " matchsticks. ")
End If
txtStatus.Text = sticks.Substring(0, sticksRemaining)
End Sub
Private Sub YourTurn(numberPicked As Integer)
If sticksRemaining <> 1 Then
sticksRemaining = sticksRemaining - numberPicked
txtStatus.Text = sticks.Substring(0, sticksRemaining)
If sticksRemaining = 1 Then
MessageBox.Show("You win.", "Congratulations")
Else
ComputerTurn()
End If
Else
Me.Close()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 116 of 443)
6. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
If radAmount.Checked And GiveOk(txtRate.Text, txtDuration.Text, txtPayment.Text) Then
txtAmount.Text = (PV(CDbl(txtRate.Text) / 1200,
CDbl(txtDuration.Text), -CDbl(txtPayment.Text))).ToString("C")
ElseIf radRate.Checked And
GiveOk(txtAmount.Text, txtDuration.Text, txtPayment.Text) Then
txtRate.Text = (1200 * Rate(CDbl(txtDuration.Text),
CDbl(txtPayment.Text), -CDbl(txtAmount.Text))).ToString("P")
ElseIf radDuration.Checked And
GiveOk(txtRate.Text, txtAmount.Text, txtPayment.Text) Then
txtDuration.Text = (NPer(CDbl(txtRate.Text) / 1200, CDbl(txtPayment.Text),
-CDbl(txtAmount.Text))).ToString("N0")
ElseIf radPayment.Checked And
GiveOk(txtRate.Text, txtDuration.Text, txtAmount.Text) Then
txtPayment.Text = (Pmt(CDbl(txtRate.Text) / 1200, CDbl(txtDuration.Text),
-CDbl(txtAmount.Text))).ToString("C")
Else
Dim prompt as String = "No item is checked, " &
"a required value is missing or is not numeric."
MessageBox.Show(prompt, "Error")
End If
End Sub
Function GiveOk(value1 As String, value2 As String, value3 As String) As Boolean
If value1 <> "" And value2 <> "" And value3 <> "" Then
If IsNumeric(value1) And IsNumeric(value2) And IsNumeric(value3) Then
Return True
End If
End If
End Function
7. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
If radPresentValue.Checked And GiveOk(txtRate.Text, txtNumberOfPayments.Text,
txtPeriodicPayment.Text, txtFutureValue.Text) Then
txtPresentValue.Text = (PV(CDbl(txtRate.Text), CInt(txtNumberOfPayments.Text),
CDec(txtPeriodicPayment.Text), -CDec(txtFutureValue.Text))).ToString("C")
ElseIf radRate.Checked And GiveOk(txtPresentValue.Text, txtNumberOfPayments.Text,
txtPeriodicPayment.Text, txtFutureValue.Text) Then
txtRate.Text = (Rate(CInt(txtNumberOfPayments.Text), -CDec(txtPeriodicPayment.Text),
-CDec(txtPresentValue.Text), CDec(txtFutureValue.Text))).ToString("P")
ElseIf radNumberOfPayments.Checked And GiveOk(txtRate.Text, txtPresentValue.Text,
txtPeriodicPayment.Text, txtFutureValue.Text) Then
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 117 of 443)
txtNumberOfPayments.Text = (NPer(CDbl(txtRate.Text), -CDec(txtPeriodicPayment.Text),
-CDec(txtPresentValue.Text), CDec(txtFutureValue.Text))).ToString("N0")
ElseIf radPeriodicPayment.Checked And GiveOk(txtRate.Text, txtNumberOfPayments.Text,
txtPresentValue.Text, txtFutureValue.Text) Then
txtPeriodicPayment.Text = (-Pmt(CDbl(txtRate.Text), CInt(txtNumberOfPayments.Text),
-CDec(txtPresentValue.Text), CDec(txtFutureValue.Text))).ToString("C")
ElseIf radfutureValue.Checked And GiveOk(txtPresentValue.Text, txtRate.Text,
txtNumberOfPayments.Text, txtPeriodicPayment.Text) Then
txtFutureValue.Text = (FV(CDbl(txtRate.Text), CInt(txtNumberOfPayments.Text),
-CDec(txtPeriodicPayment.Text), -CDec(txtPresentValue.Text))).ToString("C")
Else
Dim prompt as String = "No item is checked, " &
"a required value is missing or is not numeric."
MessageBox.Show(prompt, "Error")
End If
End Sub
Function GiveOk(value1 As String, value2 As String, value3 As String,
value4 As String) As Boolean
If value1 <> "" And value2 <> "" And value3 <> "" And value4 <> "" Then
If IsNumeric(value1) And IsNumeric(value2) And IsNumeric(value3) And
IsNumeric(value4) Then
Return True
End If
End If
End Function
Private Sub btnClear_Click(...) Handles btnClear.Click
txtPresentValue.Text = ""
txtRate.Text = ""
txtNumberOfPayments.Text = ""
txtPeriodicPayment.Text = ""
txtFutureValue.Text = ""
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 118 of 443)
8. Private Sub btnPerform_Click(...) Handles btnPerform.Click
Dim m, n, difference, reversedDifference, sum As Integer
Dim numString As String = txtNumber.Text
If IsValid(numString) Then
m = CInt(txtNumber.Text)
n = CInt(ReverseString(numString))
difference = m - n
reversedDifference = CInt(ReverseString(CStr(difference)))
sum = difference + reversedDifference
txtResult.Text = CStr(sum)
Else
MessageBox.Show("Not a proper number.")
End If
End Sub
Function IsValid(number As String) As Boolean
Return (number.Length = 3) And (number.Substring(0, 1) > number.Substring(1, 1)) And
(number.Substring(1, 1) > number.Substring(2, 1))
End Function
Function ReverseString(numString As String) As String
Return numString.Substring(2, 1) & numString.Substring(1, 1) & numString.Substring(0, 1)
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 119 of 443)
CHAPTER 6
EXERCISES 6.1
1. 18
2. 24
3. 10
4. 10
5. Maximum number: 7
6. Later than 1950.
Earlier than 1970.
They appeared on the Ed Sullivan show in February 1964. You answered
the question correctly in 3 tries.
7. Infinite loop. (To end the program, click on the Stop Debugging button on the Toolbar.)
8. Loop never terminates. The line n = 1 should appear before the Do loop.
9. Do and Loop are interchanged
10. The keyword Loop is missing.
11. While num >= 7
12. While name <> "Bob"
13. Until response <> "Y"
14. Until total <> 10
15. Until name = ""
16. While balance < 100
17. Until (a <= 1) Or (a >= 3)
18. While (ans <> "") And (n <> 0)
19. While n = 0
20. Until (ans <> "Y") Or (n >= 7)
21. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Request and display three names.
Dim name As String, num As Integer = 0
Do While num < 3
name = InputBox("Enter a name:")
lstOutput.Items.Add(name)
num +=1
Loop
End Sub
22. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display number of times question is asked.
Dim loopNum As Integer, answer As String = "Y"
Do While answer = "Y"
loopNum += 1
txtOutput.Text = CStr(loopNum)
answer = (InputBox ("Do you want to continue (Y/N)?")).ToUpper
Loop
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 120 of 443)
23. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim celsius As Double = 10
lstOutput.Items.Add("Celsius
Fahrenheit")
Do While celsius <= 40
lstOutput.Items.Add("
" & celsius & "
" &
Fahrenheit(celsius))
celsius += 5
Loop
End Sub
Function Fahrenheit(celsius As Double) As Double
'Convert Celsius to Fahrenheit
Return (9 / 5) * celsius + 32
End Function
24. Private Sub btnBounceBall_Click(...) Handles btnBounceBall.Click
'Drop a ball, and find number of bounces and total distance traveled
Dim height, bounceFactor, distance As Double
Dim bounces As Integer
InputData(height, bounceFactor)
BounceBall(height, bounceFactor, bounces, distance)
ShowData(bounces, distance)
End Sub
Sub InputData(ByRef height As Double, ByRef bounceFactor As Double)
bounceFactor = CDbl(txtCoefficient.Text)
height = CDbl(txtHeight.Text)
height = 100 * height
'Convert to centimeters
End Sub
Sub BounceBall(hght As Double, bFactor As Double,
ByRef bounces As Integer, ByRef dist As Double)
bounces = 1
'first bounce
dist = hght
Do While hght * bFactor >= 10
bounces += 1
hght = bFactor * hght
dist += 2 * hght
'Up then down again
Loop
End Sub
Sub ShowData(bounces As Integer, distance As Double)
txtBounces.Text = CStr(bounces)
txtDistance.Text = (distance / 100).ToString("N")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 121 of 443)
25. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim num, max, min As Double
Dim count As Double = 0
Dim prompt As String = "Enter a nonnegative number. " &
"Enter -1 to terminate entering numbers."
num = CDbl(InputBox(prompt))
max = num
min = num
Do While num >= 0
count += 1
num = CDbl(InputBox(prompt))
If (num <> -1) Then
If num < min Then
min = num
End If
If num > max Then
max = num
End If
End If
Loop
If count > 0 Then
txtRange.Text = CStr(max - min)
Else
MessageBox.Show("No numbers were entered.")
End If
End Sub
26. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim num, min As Double
Dim count As Double = 0
Dim prompt As String = "Enter a nonnegative number. " &
"Enter -1 to terminate entering numbers."
num = CDbl(InputBox(prompt))
min = num
Do While num >= 0
count += 1
num = CDbl(InputBox(prompt))
If (num <> -1) And (num < min) Then
min = num
End If
Loop
If count > 0 Then
MessageBox.Show("Smallest number: " & min)
Else
MessageBox.Show("No numbers were entered.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 122 of 443)
27. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim m, n, t As Integer
InputIntegers(m, n)
Do While n <> 0
t = n
n = m Mod n
'Remainder after m is divided by n
m = t
Loop
txtOutput.Text = CStr(m)
End Sub
Sub InputIntegers(ByRef m As Integer, ByRef n As Integer)
m = CInt(txtM.Text)
n = CInt(txtN.Text)
End Sub
28. Private Sub btnFind_Click(...) Handles btnFind.Click
'Prime factorization
Dim n, f As Double
lstFactors.Items.Clear()
n = CInt(txtNumber.Text)
lstFactors.Items.Add("The prime factors of " & n & ".")
f = 2
Do While n > 1
If Int(n / f) = n / f Then
'true if f divides n
lstFactors.Items.Add(f)
n = n / f
Else
f += 1
End If
Loop
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 123 of 443)
29. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim dt As Date
dt = CDate(txtMonth.Text & "/1/" & txtYear.Text)
Do Until dt.ToString("D").StartsWith("Tuesday")
dt = dt.AddDays(1)
Loop
txtDate.Text = dt.ToString("D")
End Sub
30.
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim amount, annualRate As Decimal
amount = CDec(txtAmount.Text)
annualRate = CDec(txtRate.Text)
If (amount > 0) And (annualRate > 0) Then
txtDouble.Text = CStr(DoubleYears(amount, annualRate))
End If
End Sub
Function DoubleYears(a As Decimal, r As Decimal) As Integer
Dim bal As Decimal = a
Dim years As Integer = 0
Do While bal < 2 * a
bal = (1 + r) * bal
years += 1
Loop
Return years
End Function
31. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim age As Integer = 1
Do While 1980 + age <> age ^ 2
age += 1
Loop
txtOutput.Text = age & " years old"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 124 of 443)
32. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Determine the year that the world population will exceed
'10 billion, assuming a 1.1.4% rate of increase.
Dim yr As Integer, pop As Double
yr = 2011
'Start at 2011.
pop = 7
'Population of 7 billion
Do While pop <= 10
pop = (1.011) * pop
yr += 1
Loop
txtOutput.Text = "The world population will reach 10 billion in " &
yr & "."
End Sub
33. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim amount As Double = 100
Dim yrs As Integer = 0
Do Until amount < 1
amount = 0.5 * amount
yrs += 28
Loop
txtOutput.Text = yrs & " years"
End Sub
34. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Const CURRENT_CPI As Decimal = 238.65D
Dim cpi As Decimal = CURRENT_CPI
Dim yrs As Integer
Do Until cpi >= 2 * CURRENT_CPI
cpi = 1.025D * cpi
yrs += 1
Loop
txtOutput.Text = yrs & " years"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 125 of 443)
35. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Const INTEREST_PER_MONTH As Decimal = 0.005D
Const MONTHLY_PAYMENT As Decimal = 290
Dim loanAmount As Decimal = 15000
Dim months As Integer = 0
Dim balance As Decimal = loanAmount
Do Until balance < loanAmount / 2
balance = (1 + INTEREST_PER_MONTH) * balance - MONTHLY_PAYMENT
months += 1
Loop
txtOutput.Text = months & " months"
End Sub
36. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim months As Integer = 0
Dim balance As Decimal = 0
Do Until balance > 3000
balance = 1.0025D * balance + 100
months += 1
Loop
txtOutput.Text = months & " months"
End Sub
37. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim months As Integer = 0
Dim balance As Decimal = 10000
Do Until balance < 600
balance = (1.003D * balance) - 600
months += 1
Loop
txtOutput.Text = months & " months; " & balance.ToString("C")
End Sub
38. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim months As Integer = 0
Dim balance As Decimal = CDec(txtInitialDeposit.Text)
Do Until balance < 600
balance = 1.003D * balance - 600
months += 1
Loop
txtOutput.Text = months & " months"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 126 of 443)
39. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Determine the number of times a letter appears in a sentence.
Dim letter As String = txtLetter.Text.ToUpper
Dim sentence As String = txtSentence.Text.ToUpper
Dim positionOfLetter As Integer
Dim count As Integer = -1
Do
count += 1
positionOfLetter = sentence.IndexOf(letter, positionOfLetter + 1)
Loop Until positionOfLetter = -1
txtNumberOfOccurrences.Text = CStr(count)
End Sub
40. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Describe the cooling of a hot liquid.
Dim temperature As Double = 212, count As Integer = 0
lstTemperatures.Items.Add(count & "
" & temperature)
Do Until temperature < 150
count += 1
temperature -= (temperature - 70) * 0.079
lstTemperatures.Items.Add(count & "
" & temperature.ToString("N"))
Loop
End Sub
41. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Determine when the population of India will exceed that of China
Dim chinaPop, indiaPop As Double, yr As Integer
chinaPop = 1.37
'2016
indiaPop = 1.31
'2016
yr = 2016
Do Until indiaPop > chinaPop
yr += 1
chinaPop *= 1.0066
indiaPop *= 1.013
Loop
txtYear.Text = CStr(yr)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 127 of 443)
42. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Calculate the size of group required for the likelihood
'that some shares your birthday is > 50%.
Dim num As Integer = 1
Do Until (364 / 365) ^ num < 0.5
num += 1
Loop
txtResult.Text = num & " people"
End Sub
43. Function Sustitute(strVar As String,strVar1 As String, strVar2 As String) As String
Dim n As Integer
Do Until strVar.IndexOf(strVar1) = -1
n = strVar.IndexOf(strVar1)
ListBox1.Items.Add(n)
strVar = strVar.Remove(n, strVar1.Length)
strVar = strVar.Insert(n, strVar2)
ListBox1.Items.Add(strVar)
Loop
Return strVar
End Function
EXERCISES 6.2
1. Pass #1
Pass #2
Pass #3
Pass #4
5. 5
6
7
2. 6
8
10
12
6. -9
-6
-3
3. 2
4
6
8
Who do we appreciate?
7. ••••••••••
8. 6
4. 10
9
8
7
6
5
4
3
2
1
Blastoff
9. 4
10. 4
11. The loop is never executed since 25 is greater than 1 and the step is negative.
12. Next statement is missing.
13. The For ... Next loop will not execute since 20 is greater than 0. You must add Step -1 to the
end of the For statement.
14. Since step size is 0.5, the variable j must assume noninteger values such as 1.5. However, j is
of type Integer. The word Integer should be replaced with Double.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 128 of 443)
15. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
For num As Integer = 1 To 9 Step 2
lstBox.Items.Add(num)
Next
End Sub
16. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
For num As Integer = 1 To 4
lstBox.Items.Add("hello")
Next
End Sub
17. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
Const DECAY_RATE As Double = 0.12
Dim grams As Double
grams = 10
For yearNum As Integer = 1 To 5
grams = (1 - DECAY_RATE) * grams
Next
lstOutput.Items.Add("Beginning with 10 grams of cobalt 60,")
lstOutput.Items.Add(grams.ToString("N") &
" grams remain after 5 years.")
End Sub
18. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim sum As Double = 0
For i As Integer = 1 To 100
sum += i
Next
txtSum.Text = CStr(sum)
End Sub
19. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim sum As Double = 0, num as Double = 0
For i As Integer = 1 To 5
num = CDbl(InputBox("Enter #" & i))
sum += num
Next
txtAverage.Text = (sum / 5).ToString("N")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 129 of 443)
20. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim num, max As Double
num = CDbl(InputBox("Enter #1"))
max = num
For i As Integer = 2 To 5
num = CDbl(InputBox("Enter #" & i))
If num > max Then
max = num
End If
Next
txtOutput.Text = CStr(max)
End Sub
21. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim sum As Double = 0
For denominator As Double = 1 To 100
sum += 1 / denominator
Next
txtOutput.Text = sum.ToString("N5")
End Sub
22. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim n As Integer = CInt(txtDots.Text)
Dim row As String = ""
For i As Integer = 1 To n
row &= Chr(149)
Next
txtOutput.Text = row
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 130 of 443)
23. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
Dim word As String = txtWord.Text
Dim firstLetter, secondLetter As String
Dim flag As Boolean = True
For i As Integer = 0 To word.Length - 2
firstLetter = word.Substring(i, 1)
secondLetter = word.Substring(i + 1, 1)
If firstLetter > secondLetter Then
txtOutput.Text = "No"
Exit For
End If
If i = word.Length - 2 Then
txtOutput.Text = "Yes"
End If
Next
End Sub
24. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim value As Decimal = 20000
For i As Integer = 1 To 5
value = 0.85D * value
lstOutput.Items.Add(i & ": " & value.ToString("C"))
Next
End Sub
25. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Const PERCENT_RAISE As Decimal = 0.05D
Dim name As String, age As Integer, salary As Decimal
Dim earnings As Decimal = 0
name = txtName.Text
age = CInt(txtAge.Text)
salary = CDec(txtSalary.Text)
For i As Integer = age To 65
earnings += salary
salary = salary + (PERCENT_RAISE * salary)
Next
txtOutput.Text = name & " will earn about " &
earnings.ToString("C0") & "."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 131 of 443)
26. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim amount As Decimal = 1000
Dim simple, compound As Decimal
lstOutput.Items.Clear()
lstOutput.Items.Add("
" & "SIMPLE" & "
" & "COMPOUND")
lstOutput.Items.Add("YEAR " & "INTEREST" & "
" & "INTEREST")
simple = amount
compound = amount
For i As Integer = 1 To 9
simple += 0.05D * amount
compound = 1.05D * compound
lstOutput.Items.Add(i & "
" & simple.ToString("C") &
"
" & compound.ToString("C"))
Next
End Sub
27. Private Sub btnComputeIdealWeights_Click(...) Handles _
btnComputeIdealWeights.Click
Dim lower, upper As Integer
lstWeightTable.Items.Clear()
InputBounds(lower, upper)
ShowWeights(lower, upper)
End Sub
Function IdealMan(height As Integer) As Double
'Compute the ideal weight of a man given his height
Return 4 * height - 128
End Function
Function IdealWoman(height As Integer) As Double
'Compute the ideal weight of a woman given her height
Return 3.5 * height - 108
End Function
Sub InputBounds(ByRef lower As Integer, ByRef upper As Integer)
lower = CInt(InputBox("Enter lower bound on height in inches:"))
upper = CInt(InputBox("Enter upper bound on height in inches:"))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 132 of 443)
Sub ShowWeights(lower As Integer, upper As Integer)
lstWeightTable.Items.Clear()
lstWeightTable.Items.Add("
" & "WEIGHT " & " " & "WEIGHT")
lstWeightTable.Items.Add("HEIGHT" & " " & "WOMEN
" & " " & "MEN")
For height As Integer = lower To upper
lstWeightTable.Items.Add(height & "
" &
(IdealWoman(height)).ToString("N1") &
"
" & (IdealMan(height)).ToString("N1"))
Next
End Sub
28. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
'Determine number of sibilants in sentence
txtOutput.Text = "There are " & Sibilants(txtSentence.Text) &
" sibilants in the sentence."
End Sub
Function Sibilants(sentence As String) As Integer
'Count the number of sibilants (i.e., the letters S and Z)
Dim numSibs As Integer
Dim letter As String
numSibs = 0
For i As Integer = 0 To sentence.Length - 1
letter = sentence.Substring(i, 1).ToUpper
If (letter = "S") Or (letter = "Z") Then
numSibs += 1
End If
Next
Return numSibs
End Function
29. Private Sub btnAnalyzeOptions_Click(...) Handles btnAnalyzeOptions.Click
'Compare salaries
Dim opt1, opt2 As Decimal
opt1 = Option1()
opt2 = Option2()
lstOutput.Items.Add("Option 1 = " & opt1.ToString("C"))
lstOutput.Items.Add("Option 2 = " & opt2.ToString("C"))
If opt1 > opt2 Then
lstOutput.Items.Add("Option 1 pays better.")
ElseIf opt1 = opt2
lstOutput.Items.Add("Options pay the same.
Else
lstOutput.Items.Add("Option 2 pays better.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 133 of 443)
Function Option1() As Decimal
'Compute the total salary for 10 days,
'with a flat salary of $100/day
Dim sum As Integer = 0
For i As Integer = 1 To 10
sum += 100
Next
Return sum
End Function
Function Option2() As Decimal
'Compute the total salary for 10 days,
'starting at $1 and doubling each day
Dim sum As Integer = 0, daySalary As Integer = 1
For i As Integer = 1 To 10
sum += daySalary
daySalary = 2 * daySalary
Next
Return sum
End Function
30. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim balance As Decimal = 15000
Dim yr As Integer = 238
For i As Integer = 1 To 60
balance = (1.005D * balance) - 290
If i Mod 12 = 0 Then
If balance < 0 Then
balance = 0
End If
lstOutput.Items.Add(yr & " " & balance.ToString("C"))
yr += 1
End If
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 134 of 443)
31. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim balance As Decimal = 0
Dim yr As Integer = 2016
For i As Integer = 1 To 108
balance = (1.0025D * balance) + 100
If i Mod 12 = 0 Then
lstOutput.Items.Add(yr & " " & balance.ToString("C"))
yr += 1
End If
Next
End Sub
32. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim word As String = txtWord.Text
If IsQwerty(word) Then
txtOutput.Text = "Yes"
Else
txtOutput.Text = "No"
End If
End Sub
Function IsQwerty(word As String) As Boolean
Dim n As Integer = word.Length - 1
word = word.ToUpper
For i As Integer = 0 To n
If Not (word.Substring(i, 1) = "Q" Or word.Substring(i, 1) = "W" Or
word.Substring(i, 1) = "E" Or word.Substring(i, 1) = "R" Or
word.Substring(i, 1) = "T" Or word.Substring(i, 1) = "Y" Or
word.Substring(i, 1) = "U" Or word.Substring(i, 1) = "I" Or
word.Substring(i, 1) = "O" Or word.Substring(i, 1) = "P") Then
Return False
End If
Next
Return True
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 135 of 443)
33. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
txtNfactorial.Text = CStr(Factorial(CInt(txtN.Text)).ToString("N0"))
End Sub
Function Factorial(n As Integer) As Double
Dim product As Double = 1
For i As Integer = 2 To n
product = product * i
Next
Return product
End Function
34. Private Sub btnGrades_Click(...) Handles btnGrades.Click
Dim grade As Integer
Dim sum As Integer = 0
Dim lowestGrade As Integer = 100
Dim average As Double
For i As Integer = 1 To 5
grade = CInt(InputBox("Enter grade:", "Grade #" & i))
sum += grade
If grade < lowestGrade Then
lowestGrade = grade
End If
Next
average = (sum - lowestGrade) / 4
txtAverage.Text = average.ToString("N")
End Sub
35. Private Sub btnRemove_Click(...) Handles btnRemove.Click
Dim phoneNum As String
Dim phoneNum2 As String = ""
phoneNum = txtPhone.Text
For i As Integer = 0 To phoneNum.Length - 1
Dim character As String
character = phoneNum.Substring(i, 1)
If character <> "-" Then
phoneNum2 &= character
End If
Next
txtStrippedPhone.Text = phoneNum2
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 136 of 443)
36. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim numberOfFridays As Integer
Dim dt As Date
For i As Integer = 1 To 12
dt = CDate(i & "/" & "13/" & mtbYear.Text)
If IsFriday(dt) Then
numberOfFridays += 1
End If
Next
txtNumberOfFridays.Text = CStr(numberOfFridays)
End Sub
Function IsFriday(x As Date) As Boolean
Dim dt As String = x.ToString("D")
If dt.StartsWith("Friday") Then
Return True
Else
Return False
End If
End Function
37. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim numberOfFridays As Integer
Dim dt As Date
For i As Integer = 2000 To 2999
For j As Integer = 1 To 12
dt = CDate(j & "/" & "13/" & i)
If IsFriday(dt) Then
numberOfFridays += 1
End If
Next
Next
txtNumberOfFridays.Text = CStr(numberOfFridays)
End Sub
Function IsFriday(x As Date) As Boolean
Dim dt As String = x.ToString("D")
If dt.StartsWith("Friday") Then
Return True
Else
Return False
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 137 of 443)
38. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim msg As String = "Enter sales for year:"
Dim sales As Decimal
Dim sum As Decimal
Dim numYears As Integer = CInt(txtEndYr.Text) - CInt(txtBegYr.Text) + 1
lstOutput.Items.Add("Sales in Millions")
For yr As Integer = CInt(txtBegYr.Text) To CInt(txtEndYr.Text)
sales = CDec(InputBox(msg & yr & "."))
sum += sales
lstOutput.Items.Add(yr & " " & ProduceBar(CInt(sales)) & " " & sales)
Next
txtAverage.Text = (sum / numYears).ToString("C") & " million"
End Sub
Function ProduceBar(num As Integer) As String
Dim bar As String = ""
For i As Integer = 1 To num
bar &= Chr(149)
Next
Return bar
End Function
39. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim price, quantity As Decimal
lstOutput.Items.Clear()
quantity = 80 'current crop of soybeans in millions of bushels
lstOutput.Items.Add("YEAR" & "
" & "QUANTITY" & "
" & "PRICE")
For yr As Integer = 2015 To 2024
price = 20 – (0.1D * quantity)
lstOutput.Items.Add(yr & "
" & quantity.ToString("N") &
"
" & price.ToString("C"))
quantity = 5 * price - 10
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 138 of 443)
40. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Determine if a word is a quasi-palindrome.
Dim originalWord, newWord, reversedNewWord As String
originalWord = txtWord.Text
newWord = originalWord.Substring(1) & originalWord.Substring(0, 1)
reversedNewWord = ""
For i As Integer = newWord.Length - 1 To 0 Step -1
reversedNewWord = reversedNewWord & newWord.Substring(i, 1)
Next
If reversedNewWord = originalWord Then
txtAnswer.Text = "YES"
Else
txtAnswer.Text = "NO"
End If
End Sub
41. Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Compare two salary options.
Dim amount1 As Decimal = 0, amount2 As Decimal = 0
Dim salaryPerPeriod1 As Decimal = 20000
Dim salaryPerPeriod2 As Decimal = 10000
'Option 1: each period is one year
For i As Integer = 1 To 10
amount1 += salaryPerPeriod1
salaryPerPeriod1 += 1000
Next
txtOption1.Text = amount1.ToString("C0")
'Option 2: each period is six months
For i As Integer = 1 To 20
amount2 += salaryPerPeriod2
salaryPerPeriod2 += 250
Next
txtOption2.Text = amount2.ToString("C0")
End Sub
42. Private Sub btnFind_Click(...) Handles btnFind.Click
'Find a number with a special property.
Dim n As Integer
For m As Integer = 1000 To 9999
n = 4 * m
If Len(CStr(n)) = 4 Then
If Reverses(m, n) Then
txtNumber.Text = CStr(m)
txtTimesFour.Text = CStr(n)
End If
End If
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 139 of 443)
Function Reverses(m As Integer, n As Integer) As Boolean
Dim mString As String = CStr(m), nString As String = CStr(n)
For i As Integer = 0 To 3
If mString.Substring(i, 1) <> nString.Substring(3 - i, 1) Then
Return False
End If
Next
Return True
End Function
43. Private Sub btnCount_Click(...) Handles btnCount.Click
'Count the number of odometer readings containing the digit 1.
Dim total As Integer = 0
For i As Integer = 0 To 999999
If CStr(i).IndexOf("1") <> -1 Then
total += 1
End If
Next
txtAnswer.Text = total.ToString("N0")
'Note: The answer is 10^6 - 9^6, the total number of odometer readings
'minus the number of odometer readings that do not contain the digit 1.
End Sub
44. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Calculate the sum of the digits in the first million positive integers.
Dim sum As Integer, strNum As String
For i As Integer = 1 To 1000000
strNum = CStr(i)
For j As Integer = 0 To strNum.Length - 1
sum += CInt(strNum.Substring(j, 1))
Next
Next
txtAnswer.Text = sum.ToString("N0")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 140 of 443)
45. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
'Calculate the likelihood of two people in a group having the same birthday.
Dim n As Integer = 365
Dim product, prob As Double
lstProbabilities.Items.Add("Number of People Probability")
For r As Integer = 20 To 30
product = 1
For i As Integer = 0 To (r – 1)
product *= (n - i) / n
Next
prob = 1 - product
lstProbabilities.Items.Add("
" & r & "
" &
prob.ToString("N3"))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 141 of 443)
46. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
Dim sentence As String = txtSentence.Text
txtWords.Text = CStr(CountNumberOfWords(sentence))
txtLetters.Text = CStr(CountNumberOfLetters(sentence))
End Sub
Function CountNumberOfWords(sentence As String) As Integer
Dim counter As Integer = 0
For i As Integer = 0 To sentence.Length - 1
If sentence.Substring(i, 1) = " " Then
counter += 1
End If
Next
Return (counter + 1)
End Function
Function CountNumberOfLetters(sentence As String) As Integer
Dim counter As Integer = 0
Dim letter As String
For i As Integer = 0 To sentence.Length - 1
letter = sentence.Substring(i, 1).ToUpper
If (letter >= "A" And letter <= "Z") Then
counter += 1
End If
Next
Return (counter)
End Function
EXERCISES 6.3
1. Mozart
5. 3
11. 300
2. chopin
6. 2
7. 80
3. Tchaikovsky
8. 70
9. 70
4. Mozart
10. 1
12. 60
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 142 of 443)
13. Private Sub btnCount_Click(...) Handles btnCount.Click
Dim numWon As Integer = 0
For i As Integer = 0 To lstBox.Items.Count - 1
If CStr(lstBox.Items(i)) = "USC" Then
numWon += 1
End If
Next
txtOutput.Text = CStr(numWon)
End Sub
14. Private Sub lstBox_SelectedIndexChanged(...) Handles _
lstBox.SelectedIndexChanged
Dim college As String = lstBox.Text
Dim numWon As Integer = 0
For i As Integer = 0 To lstBox.Items.Count - 1
If CStr(lstBox.Items(i)) = college Then
numWon += 1
End If
Next
txtOutput.Text = CStr(numWon)
End Sub
15. Private Sub btnCount_Click(...) Handles btnDetermine.Click
Dim college As String = txtCollege.Text
txtOutput.Clear()
For i As Integer = 0 To lstBox.Items.Count - 1
If CStr(lstBox.Items(i)) = college Then
txtOutput.Text = "YES"
Exit For
End If
Next
If txtOutput.Text = "" Then
txtOutput.Text = "NO"
End If
End Sub
or
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 143 of 443)
Private Sub btnCount_Click(...) Handles btnDetermine.Click
Dim college As String = txtCollege.Text
Dim i As Integer = 0
Dim found As Boolean = False
Do Until (found = True) Or (i = lstBox.Items.Count)
If CStr(lstBox.Items(i)) = college Then
found = True
End If
i += 1
Loop
If found Then
txtOutput.Text = "YES"
Else
txtOutput.Text = "NO"
End If
End Sub
16. Private Sub btnCount_Click(...) Handles btnDetermine.Click
Dim college As String = txtCollege.Text
Dim i As Integer = 0
Dim found As Boolean = False
Do Until (college <= CStr(lstBox.Items(i))) Or
(i = lstBox.Items.Count - 1)
i += 1
Loop
If CStr(lstBox.Items(i)) = college Then
found = True
End If
If found Then
txtOutput.Text = "YES"
Else
txtOutput.Text = "NO"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 144 of 443)
17. Private Sub btnReverse_Click(...) Handles btnReverse.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
For i As Integer = highestIndex To 0 Step -1
lstBox2.Items.Add(lstBox.Items(i))
Next
End Sub
18. Private Sub btnRemove_Click(...) Handles btnRemove.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim college As String
lstBox2.Sorted = True
For i As Integer = 0 To highestIndex
college = CStr(lstBox.Items(i))
If lstBox2.Items.IndexOf(college) = -1 Then
lstBox2.Items.Add(college)
End If
Next
End Sub
19. Private Sub btnAlphabetize_Click(...) Handles btnAlphabetize.Click
lstBox2.Sorted = True
Dim highestIndex As Integer = lstBox.Items.Count - 1
For i As Integer = 0 To highestIndex
lstBox2.Items.Add(lstBox.Items(i))
Next
End Sub
20. Private Sub btnAlphabetize_Click(...) Handles btnAlphabetize.Click
lstBox.Sorted = True
Dim highestIndex As Integer = lstBox.Items.Count - 1
For i As Integer = highestIndex To 0 Step -1
lstBox2.Items.Add(lstBox.Items(i))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 145 of 443)
21. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim state As String
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.Length = 7 Then
lstBox2.Items.Add(state)
End If
Next
End Sub
22. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim numberOfStates As Integer = lstBox.Items.Count
Dim i As Integer
Dim foundFlag As Boolean = False
Dim state As String
Do Until (i = numberOfStates) Or (foundFlag = True)
state = CStr(lstBox.Items(i))
If state.Length = 7 Then
txtOutput.Text = state
foundFlag = True
End If
i += 1
Loop
End Sub
23. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim state As String
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.StartsWith("New") Then
txtOutput.Text = state
Exit For
End If
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 146 of 443)
24. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim state As String
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.StartsWith("New") Then
lstBox2.Items.Add(state)
End If
Next
End Sub
25. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim maxLength As Integer = 0
Dim state As String
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.Length > maxLength Then
maxLength = state.Length
End If
Next
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.Length = maxLength Then
lstBox2.Items.Add(state)
End If
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 147 of 443)
26. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim minLength As Integer = 100
Dim state As String
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.Length < minLength Then
minLength = state.Length
End If
Next
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.Length = minLength Then
lstBox2.Items.Add(state)
End If
Next
End Sub
27. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim state As String
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If NumberOfVowels(state) = 4 Then
lstBox2.Items.Add(state)
End If
Next
End Sub
Function NumberOfVowels(word As String) As Integer
Dim numVowels As Integer = 0
word = word.ToUpper
Dim letter As String
Dim numLetters As Integer = word.Length
For i As Integer = 0 To (numLetters - 1)
letter = word.Substring(i, 1)
If (letter = "A") Or (letter = "E") Or (letter = "I") Or
(letter = "O") Or (letter = "U") Then
numVowels += 1
End If
Next
Return numVowels
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 148 of 443)
28. Private Sub lstBox_SelectedIndexChanged(...) Handles _
lstBox.SelectedIndexChanged
Dim state As String = lstBox.Text
txtOutput.Text = NumberOfVowels(state) & " letters are vowels"
End Sub
Function NumberOfVowels(word As String) As Integer
Dim numVowels As Integer = 0
word = word.ToUpper
Dim letter As String
Dim numLetters As Integer = word.Length
For i As Integer = 0 To (numLetters - 1)
letter = word.Substring(i, 1)
If (letter = "A") Or (letter = "E") Or (letter = "I") Or
(letter = "O") Or (letter = "U") Then
numVowels += 1
End If
Next
Return numVowels
End Function
29. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim state As String
Dim maxNumOfVowels = 0
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If NumberOfVowels(state) > maxNumOfVowels Then
maxNumOfVowels = NumberOfVowels(state)
End If
Next
txtOutput.Text = CStr(maxNumOfVowels)
End Sub
Function NumberOfVowels(word As String) As Integer
Dim numVowels As Integer = 0
word = word.ToUpper
Dim letter As String
Dim numLetters As Integer = word.Length
For i As Integer = 0 To (numLetters - 1)
letter = word.Substring(i, 1)
If (letter = "A") Or (letter = "E") Or (letter = "I") Or
(letter = "O") Or (letter = "U") Then
numVowels += 1
End If
Next
Return numVowels
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 149 of 443)
30. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim highestIndex As Integer = lstBox.Items.Count - 1
Dim state As String
Dim numStates As Integer = 0
For i As Integer = 0 To highestIndex
state = CStr(lstBox.Items(i))
If state.IndexOf(" ") <> -1 Then
numStates += 1
End If
Next
txtOutput.Text = CStr(numStates)
End Sub
31. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
txtOutput.Text = CStr(lstBox.Items(0))
End Sub
32. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim numStates As Integer = lstBox.Items.Count
txtOutput.Text = CStr(lstBox.Items(numStates - 1))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 150 of 443)
33. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
txtOutput.Text = CStr(lstBox.Items(4))
End Sub
34. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
For i As Integer = 0 To 12
lstBox2.Items.Add(lstBox.Items(i))
Next
End Sub
35. Private Sub btnRecord_Click(...) Handles btnRecord.Click
lstGrades.Items.Add(txtGrade.Text)
txtGrade.Clear()
txtGrade.Focus()
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sum As Double = 0
Dim minGrade As Double = 100
If lstGrades.Items.Count > 0 Then
For i As Integer = 0 To lstGrades.Items.Count - 1
sum += CDbl(lstGrades.Items(i))
If CDbl(lstGrades.Items(i)) < minGrade Then
minGrade = CDbl(lstGrades.Items(i))
End If
Next
Else
MessageBox.Show("You must first enter some grades.")
End If
txtAverage.Text = (sum / lstGrades.Items.Count).ToString("N2")
txtLowest.Text = CStr(minGrade)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 151 of 443)
36. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sum As Double = 0
Dim sum2 As Double = 0
Dim maxGrade As Double = 0
Dim aveGrade As Double
Dim numGrades As Integer = lstGrades.Items.Count
If lstGrades.Items.Count > 0 Then
'condition is True when
'
the list box is nonempty
For i As Integer = 0 To numGrades - 1
sum += CDbl(lstGrades.Items(i))
If CDbl(lstGrades.Items(i)) > maxGrade Then
maxGrade = CDbl(lstGrades.Items(i))
End If
Next
Else
MessageBox.Show("You must first enter some grades.")
End If
aveGrade = sum / numGrades
For i As Integer = 0 To (numGrades - 1)
sum2 += (CDbl(lstGrades.Items(i)) - aveGrade) ^ 2
Next
txtAverage.Text = aveGrade.ToString("N")
txtHighest.Text = CStr(maxGrade)
txtStandardDev.Text = (Math.Sqrt(sum2 / numGrades)).ToString("N")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 152 of 443)
37. Private Sub btnRecord_Click(...) Handles btnRecord.Click
lstGrades.Items.Add(txtGrade.Text)
txtGrade.Clear()
txtGrade.Focus()
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sum As Double = 0
Dim maxGrade As Double = 0
Dim minGrade As Double = 100
If lstGrades.Items.Count > 0 Then
For i As Integer = 0 To lstGrades.Items.Count - 1
sum += CDbl(lstGrades.Items(i))
If CDbl(lstGrades.Items(i)) > maxGrade Then
maxGrade = CDbl(lstGrades.Items(i))
End If
If CDbl(lstGrades.Items(i)) < minGrade Then
minGrade = CDbl(lstGrades.Items(i))
End If
Next
Else
MessageBox.Show("You must first enter some grades.")
End If
txtAverage.Text = (sum / lstGrades.Items.Count).ToString("N")
txtRange.Text = CStr(maxGrade - minGrade)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 153 of 443)
38. Private Sub btnRecord_Click(...) Handles btnRecord.Click
lstGrades.Items.Add(txtGrade.Text)
txtGrade.Clear()
txtGrade.Focus()
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sum As Double = 0
Dim averageGrade As Double = 0
Dim numAboveAverage As Integer = 0
If lstGrades.Items.Count > 0 Then
'condition is True when
'the list box is nonempty
For i As Integer = 0 To lstGrades.Items.Count - 1
sum += CDbl(lstGrades.Items(i))
Next
Else
MessageBox.Show("You must first enter some grades.")
End If
averageGrade = sum / lstGrades.Items.Count
For i As Integer = 0 To lstGrades.Items.Count - 1
If CDbl(lstGrades.Items(i)) > averageGrade Then
numAboveAverage += 1
End If
Next
txtAverage.Text = averageGrade.ToString("N")
txtAboveAverage.Text = CStr(numAboveAverage)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 154 of 443)
39. Private Sub btnSearch_Click(...) Handles btnSearch.Click
Dim letters As String = mtbFirstTwoLetters.Text.ToUpper
Dim i As Integer = 49
'index of the state currently considered
Do Until (CStr(lstStates.Items(i)).ToUpper <= letters) Or (i = 0)
i = i - 1
Loop
If CStr(lstStates.Items(i + 1)).ToUpper.StartsWith(letters) Then
txtOutput.Text = CStr(lstStates.Items(i + 1)) & " begins with " &
mtbFirstTwoLetters.Text & "."
ElseIf CStr(lstStates.Items(0)).ToUpper.StartsWith(letters) Then
txtOutput.Text = CStr(lstStates.Items(0)) & " begins with " &
mtbFirstTwoLetters.Text & "."
Else
txtOutput.Text = "No state begins with " &
mtbFirstTwoLetters.Text & "."
End If
End Sub
40. Private Sub txtNation_TextChanged(...) Handles txtNation.TextChanged
'Locate a nation in a list of nations.
Dim letters As String = "", nation As String = ""
Dim found As Boolean, i As Integer = 0
letters = txtNation.Text.ToUpper
Do Until found Or i = lstNations.Items.Count
If CStr(lstNations.Items(i)).ToUpper.StartsWith(letters) Then
found = True
lstNations.SelectedIndex = i
End If
i += 1
Loop
If Not found Then
MessageBox.Show("No nation begins with those letters.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 155 of 443)
CHAPTER 6 PROGRAMMING PROJECTS
1. Const CAFFEINE_PER_CUP As Double = 130
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim amount As Double = CAFFEINE_PER_CUP
Dim hrs As Integer
Do Until amount <= CAFFEINE_PER_CUP / 2
amount = 0.87 * amount
hrs += 1
Loop
txt65.Text = hrs & " hours"
amount = CAFFEINE_PER_CUP
For i As Integer = 1 To 24
amount = 0.87 * amount
Next
txtOne24.Text = amount.ToString("N") & " mg."
amount = CAFFEINE_PER_CUP
For i As Integer = 1 To 24
amount = 0.87 * amount + CAFFEINE_PER_CUP
Next
txtMany24.Text = amount.ToString("N") & " mg."
End Sub
2. Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
'Evaluate Rule of 72
Dim years As Integer
Dim amt As Decimal
lstOutput.Items.Clear()
For intRate As Integer = 1 To 20
amt = 100
years = 0
Do While amt < 200
years += 1
amt *= CDec(1 + (intRate / 100))
Loop
lstOutput.Items.Add("Interest rate: " & (intRate / 100).ToString("P0"))
lstOutput.Items.Add("Rule of 72 doubling time: " &
Math.Round(72 / intRate))
lstOutput.Items.Add("Actual doubling time: " & years)
lstOutput.Items.Add("")
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 156 of 443)
3. Private Sub btnMaxHeight_Click(...) Handles btnMaxHeight.Click
Dim h0, v0 As Double
lstOutput.Items.Clear()
InputData(h0, v0)
lstOutput.Items.Add("The maximum height is ")
lstOutput.Items.Add(HeightOfBall(h0, v0, v0 / 32) & " feet")
End Sub
Private Sub btnApproxTime_Click(...) Handles btnApproxTime.Click
Dim h0, v0 As Double
lstOutput.Items.Clear()
InputData(h0, v0)
lstOutput.Items.Add("The ball will hit the ground after")
lstOutput.Items.Add("approximately " & TimeToHit(h0, v0) & " seconds.")
End Sub
Private Sub btnTable_Click(...) Handles btnTable.Click
Dim h0, v0 As Double
lstOutput.Items.Clear()
InputData(h0, v0)
ShowHeights(h0, v0)
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
Me.Close()
End Sub
Function HeightOfBall(h0 As Double, v0 As Double,
t As Double) As Double
'Return height at time t
Return h0 + v0 * t - 16 * t * t
End Function
Sub InputData(ByRef h0 As Double, ByRef v0 As Double)
'Input the initial height and velocity
h0 = CDbl(txtInitialHeight.Text)
v0 = CDbl(txtInitialVelocity.Text)
End Sub
Sub ShowHeights(h0 As Double, v0 As Double)
'Create table of heights
Dim t, height As Double
lstOutput.Items.Add("
" & "TIME" & "
" & "HEIGHT")
t = 0
height = HeightOfBall(h0, v0, t)
Do
lstOutput.Items.Add("
" & t.ToString("N") &
"
" & height.ToString("N1"))
t += 0.25
height = HeightOfBall(h0, v0, t)
Loop Until (t > 5) Or (height < 0)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 157 of 443)
Function TimeToHit(h0 As Double, v0 As Double) As Double
'Determine seconds until ball hits ground
Dim t As Double = 0.01
Do While HeightOfBall(h0, v0, t) > 0
t += 0.1
Loop
Return t
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 158 of 443)
4. Private Sub btnStrLine_Click(...) Handles btnStrLine.Click
Dim item As String = ""
Dim purchYear As Integer
Dim cost As Decimal, numYears As Integer
InputData(item, purchYear, cost, numYears)
ShowDepSchedule(item, purchYear, cost, numYears, 1)
End Sub
Private Sub btnDoubleDecl_Click(...) Handles btnDoubleDecl.Click
Dim item As String = ""
Dim purchYear As Integer
Dim cost As Decimal, numYears As Integer
InputData(item, purchYear, cost, numYears)
ShowDepSchedule(item, purchYear, cost, numYears, 2)
End Sub
Sub InputData(ByRef item As String, ByRef purchYear As Integer,
ByRef cost As Decimal, ByRef numYears As Integer)
item = txtDesc.Text
purchYear = CInt(txtYear.Text)
cost = CDec(txtCost.Text)
numYears = CInt(txtNumYears.Text)
End Sub
Sub ShowHeading(item As String, purchYear As Integer, cost As Decimal,
numYears As Integer, depType As Integer)
Dim method As String
lstOutput.Items.Add("Description: " & item)
lstOutput.Items.Add("Year of purchase: " & purchYear)
lstOutput.Items.Add("Cost: " & cost.ToString("C"))
lstOutput.Items.Add("Estimated life: " & numYears)
If depType = 1 Then
method = "straight-line"
Else
method = "double-declining balance"
End If
lstOutput.Items.Add("Method of depreciation: " & method)
lstOutput.Items.Add("")
End Sub
Sub ShowDepSchedule(item As String, purchYear As Integer, cost As Decimal,
numYears As Integer, depType As Integer)
Dim depreciation, straightLineDep, totalDeprec,value As Decimal
'Display a depreciation schedule
'If using the "straight-line" method of depreciation,
'
the depreciation will be constant (1/nth of original cost)
'If using the "double-declining" method of depreciation, the item will
'depreciate each year by 2/nths of its value at the beginning of the year
lstOutput.Items.Clear()
ShowHeading(item, purchYear, cost, numYears, depType)
'Initialize
value = cost 'value will hold the current value of the item
'For the straight-line method, the depreciation will
' be constant, so we set it here outside the loop
If depType = 1 Then
straightLineDep = CDec((1 / numYears) * value)
End If
totalDeprec = 0
For yr As Integer = 1 To numYears 'Loop through n years
'Calculate the amount the item will depreciate this year
If yr <> numYears Then
If depType = 1 Then
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 159 of 443)
'Straight-line -- constant depreciation;
'calculated before entering loop
depreciation = straightLineDep
Else
'Double declining (2/nths of value at beginning of year)
depreciation = CDec((2 / numYears) * value)
End If
Else
'In last year, depreciation is the remaining value
depreciation = value
End If
totalDeprec += depreciation
'Show the status before and after taking depreciation
lstOutput.Items.Add("Value at beginning of " & purchYear + yr - 1 & ": " &
value.ToString("C"))
lstOutput.Items.Add("Amount of depreciation during " & purchYear + yr - 1 &
": " & depreciation.ToString("C"))
lstOutput.Items.Add("Total depreciation at end of " &
purchYear + yr - 1 & ": " & totalDeprec.ToString("C"))
lstOutput.Items.Add("")
'Apply the depreciation and move to next year
value = value - depreciation
Next yr
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 160 of 443)
5. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim word As String = txtWord.Text.ToUpper
If IsTripleConsecutive(word) Then
txtOutput.Text = "YES"
Else
txtOutput.Text = "NO"
End If
End Sub
Function IsTripleConsecutive(word As String) As Boolean
Dim n As Integer = word.Length
For i As Integer = 0 To n - 3
Dim threeLetters As String = word.Substring(i, 3)
If Asc(threeLetters.Substring(0, 1)) + 1 =
Asc(threeLetters.Substring(1, 1)) And
Asc(threeLetters.Substring(1, 1)) + 1 =
Asc(threeLetters.Substring(2, 1)) Then
Return True
End If
Next
Return False
End Function
6. Private Sub btnRemoveParens_Click(...) Handles btnRemoveParens.Click
'Remove parentheses and their contents from a sentence
Dim sentence, letter, newSentence As String
Dim parensFlag As Boolean, position As Integer
sentence = txtSentence.Text
newSentence = ""
parensFlag = False
position = 0
Do Until position > sentence.Length - 1
letter = sentence.Substring(position, 1)
Select Case letter
Case "("
parensFlag = True
Case ")"
parensFlag = False
position = position + 1
Case Else
If parensFlag = False Then
newSentence &= letter
End If
End Select
position += 1
Loop
txtOutput.Text = newSentence
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 161 of 443)
7. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim phrase As String
phrase = txtPhrase.Text
If IsPalindrome(phrase) Then
txtResult.Text = "YES"
Else
txtResult.Text = "NO"
End If
End Sub
Function IsPalindrome(phrase As String) As Boolean
Dim strippedPhrase As String = "", letter As String = ""
Dim revStrippedPhrase As String = ""
phrase = phrase.ToUpper
For i As Integer = 0 To phrase.Length - 1
letter = phrase.Substring(i, 1)
If ((letter <> " ") And (letter <> "?")) And
((letter <> Chr(34)) And (letter <> "'") And
(letter <> ",") And (letter <> "!") And
(letter <> ";") And (letter <> ":") And
(letter <> ".")) Then
strippedPhrase &= letter
End If
Next
For i As Integer = strippedPhrase.Length - 1 To 0 Step -1
letter = strippedPhrase.Substring(i, 1)
revStrippedPhrase &= letter
Next
If revStrippedPhrase = strippedPhrase Then
Return True
Else
Return False
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 162 of 443)
8. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim balance, earlBalanceAfter15Years, earlBalanceUponRetirement,
larryBalanceUponRetirement As Decimal
txtDepositedEarl.Text = (15 * 5000).ToString("C")
txtDepositedLarry.Text = (33 * 5000).ToString("C")
'Earl's IRA Amount
balance = 0
For i As Integer = 1 To 15
balance = (1.04D * balance) + 5000
Next
earlBalanceAfter15Years = balance
earlBalanceUponRetirement = CDec(earlBalanceAfter15Years * ((1.04) ^ 33))
txtEarlAtRetirement.Text = earlBalanceUponRetirement.ToString("C")
'Larry's IRA Amount
balance = 0
For i As Integer = 1 To 33
balance = 1.04D * balance + 5000
Next
larryBalanceUponRetirement = balance
txtLarryAtRetirement.Text = larryBalanceUponRetirement.ToString("C")
End Sub
9. Private Sub btnValidate_Click(...) Handles btnValidate.Click
'Validate a credit card number.
Dim number As String
Dim sum, digit As Integer
number = txtNumber.Text
For i As Integer = 0 To number.Length - 1
digit = CInt(number.Substring(i, 1))
If i Mod 2 = 0 Then
If digit < 5 Then
sum += 2 * digit
Else
sum += 2 * digit - 9
End If
Else
sum += digit
End If
Next
If sum Mod 10 = 0 Then
txtResult.Text = "YES"
Else
txtResult.Text = "NO"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 163 of 443)
10. Private Sub btnEncode_Click(...) Handles btnEncode.Click
'Encode a word using a modified Soundex system.
Dim originalWord, alteredWord, codedWord, letter As String,
pos, pos2 As Integer
originalWord = txtWord.Text
alteredWord = originalWord.Substring(0, 1).ToUpper
For i As Integer = 1 To originalWord.Length - 1
Select Case originalWord.Substring(i, 1)
Case "a", "e", "i", "o", "u", "y"
alteredWord &= "9"
Case "b", "f", "p", "v"
alteredWord &= "1"
Case "c", "g", "j", "k", "q", "s", "x", "z"
alteredWord &= "2"
Case "d", "t"
alteredWord &= "3"
Case "l"
alteredWord &= "4"
Case "m", "n"
alteredWord &= "5"
Case "r"
alteredWord &= "6"
End Select
Next
'remove duplicates
pos = 1
pos2 = alteredWord.Length
codedWord = alteredWord.Substring(0, 1).ToUpper
For i = 1 To alteredWord.Length - 2
If alteredWord.Substring(pos, 1) = alteredWord.Substring(pos + 1, 1) Then
alteredWord = alteredWord.Substring(0, pos + 1) &
alteredWord.Substring(pos + 2)
Else
pos += 1
End If
Next
'strip 9s
pos = alteredWord.Length - 1
For i As Integer = 1 To pos
letter = alteredWord.Substring(i, 1)
If letter <> "9" Then
codedWord &= letter
End If
Next
Select Case codedWord.Length
Case 1
codedWord &= "000"
Case 2
codedWord &= "00"
Case 3
codedWord &= "0"
Case Is > 4
codedWord = codedWord.Substring(0, 4)
End Select
txtCodedWord.Text = codedWord
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 164 of 443)
11. Private Sub btnSearch_Click(...) Handles btnSearch.Click
Dim letters As String = mtbFirstTwoLetters.Text.ToUpper
Dim flag As Boolean = False
Dim state As String
Dim first, middle, last As Integer
first = 0
last = lstStates.Items.Count - 1
Do While (Not flag) And (first <= last)
middle = CInt((first + last) / 2)
Select Case CStr(lstStates.Items(middle)).Substring(0, 2).ToUpper
Case letters
state = CStr(lstStates.Items(middle))
flag = True
Case Is > letters
last = middle - 1
Case Is < letters
first = middle + 1
End Select
Loop
If flag Then
txtOutput.Text = state & " begins with " & mtbFirstTwoLetters.Text & "."
Else
txtOutput.Text = "No state begins with " & mtbFirstTwoLetters.Text & "."
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 165 of 443)
CHAPTER 7
EXERCISES 7.1
1. 101
2. 99
3. Have a dessert spoon.
4. Leaf 1: sunshine
Leaf 2: rain
Leaf 3: the roses that bloom in the lane
Leaf 4: somebody I adore
5. Yes
6. Age of United States: 240
8. Ken
9. You have a trio.
(age will vary; was 240 in 2016)
10. A rook is worth more than a bishop
11. Your average is 80
12. Al Gore
Gore Vidal
Vidal Sassoon
13. The Artist won in 2012
14. 33
15. one,two,three
16. 1,2,3
17. 2 even numbers
18. at least one five-letter word
19. Pearl Harbor: 1941
20. Bicentennial Year: 1976
21. contains a 19th-century date
22. 2 20th-century dates
23. 6 words begin with a vowel
24. 92
100
97
25. 4
6
2
27. (a) Superior (last name in alphabetical order)
(b) Erie
(first name in alphabetical order)
(c) Huron
(first name in the array)
(d) Superior (last name in the array)
(e) 5
(number of names in the array)
(f) Ontario (second name in the array)
(g) 3
(first array subscript whose element is Erie)
28. (a) 32000
(b) 8000
(c) 23000
(d) 32000
(e) 5
(f) 95000
(g) 19000
(h) 22000
(i) 1
7. 12
(greatest surface area of one of the Great Lakes)
(smallest surface area of one of the Great Lakes)
(first surface area in the array)
(last surface area in the array)
(number of surface areas in the array)
(sum of the surface areas of the five Great Lakes)
(average surface area of the five Great Lakes)
(third surface area in the array)
(first array subscript whose element is 8000)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
26. SEVEN
Instructor Solutions Manual (Page 166 of 443)
29. (a) 6.7 (greatest population of a New England state)
(b) 0.6 (least population of a New England state)
(c) 3.6 (first population in the array)
(d) 1.3 (last population in the array)
(e) 6
(number of numbers in the array)
(f) 1.1 (fourth population in the array)
(g) 3
(first array subscript whose element is 1.1)
30. (a) Vermont
(last name in alphabetical order)
(b) Connecticut (first name in alphabetical order)
(c) Connecticut (first New England state to join the union)
(d) Maine
(last New England state to join the union)
(e) 6
(number of New England states)
(f) Connecticut (first New England state to join the union)
(g) 5
(Maine was the sixth NE state to join the union)
31. (a) lstOutput.Items.Add(states.First)
or lstOutput.Items.Add(states(0))
(b) For i As Integer = 0 To 12
lstOutput.Items.Add(states(i))
Next
(c) lstOutput.Items.Add(states.Last)
or lstOutput.Items.Add(states(49))
(d) lstOutput.Items.Add(CStr(Array.IndexOf(states, "Ohio") + 1))
(e) lstOutput.Items.Add(states(1))
(f) lstOutput.Items.Add(states(19))
(g) For i As Integer = (states.Count - 9) To (states.Count)
lstOutput.Items.Add(states(i - 1))
Next
32. (a) txtOutput.Text = pres.First 'or txtOutput.Text = pres(0)
(b) For i As Integer = 0 To 5
lstoutput.Items.Add(pres(i))
Next
(c) txtOutput.Text = pres.Last 'or txtOutput.Text = pres(43)
(d) txtOutput.Text = CStr(Array.IndexOf(pres, "James Monroe") + 1)
(e) txtOutput.Text = pres(1)
(f) txtOutput.Text = pres(9)
(g) For i As Integer = (pres.Count - 4) To pres.Count
lstoutput.Items.Add(pres(i - 1))
Next
33. Function Task(nums() As Integer) As Integer
Dim sum As Integer = 0
For Each num As Integer In nums
sum += num
Next
Return sum
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 167 of 443)
34. Function Task(nums() As Integer) As Double
Dim sum As Integer = 0
For Each As Integer In nums
sum += num
Next
Return sum / nums.Count
End Function
35. Function Task(nums() As Integer) As Integer
Dim maxEven As Integer = 0
For Each num As Integer In nums
If (num Mod 2 = 0) And (num > maxEven) Then
maxEven = num
End If
Next
Return maxEven
End Function
36. Function Task(nums() As Integer) As Integer
Dim min As Integer = nums(0)
For Each num As Integer In nums
If num < min Then
min = num
End If
Next
Return min
End Function
37. Function Task(nums() As Integer) As Integer
Dim twoDigits As Integer = 0
For Each num As Integer In nums
If (num > 9) And (num < 100) Then
twoDigits += 1
End If
Next
Return twoDigits
End Function
38. Function Task(nums() As Integer) As Integer
Dim numEvens As Integer = 0
For Each num As Integer In nums
If (num Mod 2 = 0) Then
numEvens += 1
End If
Next
Return numEvens
End Function
39. nums(3) should be changed to nums()
40. Will produce an IndexOutOfRange exception since nums.Count is greater than the upper
bound of nums
41. Logic error. The values of the array elements cannot be altered inside a For Each loop. The
output will be 6.
42. Integer should be changed to String.
43. lstBox.Items.Add(line.Split(" "c).Count)
44. lstBox.Items.Add(IO.File.ReadAllLines("Names.txt").Count)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 168 of 443)
45. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim numStr() As String = IO.File.ReadAllLines("Numbers.txt")
Dim nums(numStr.Count - 1) As Integer
For i As Integer = 1 To (nums.Count – 1)
nums(i) = CInt(numStr(i))
Next
lstOutput.Items.Add("Number of integers in the file: " & nums.Count)
lstOutput.Items.Add("Sum of integers in the file: " & nums.Sum)
End Sub
46. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim states() As String = IO.File.ReadAllLines("SomeStates.txt")
Dim orderedFlag As Boolean = True
For i As Integer = 0 To states.Count - 2
If states(i + 1) < states(i) Then
orderedFlag = False
End If
Next
If orderedFlag Then
txtOutput.Text = "YES"
Else
txtOutput.Text = "NO"
End If
End Sub
47. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim names() As String = IO.File.ReadAllLines("Names2.txt")
Dim dups(names.Count - 1) As String
Dim n As Integer = 0
'index for dups
For i As Integer = 0 To names.Count - 2
If (names(i + 1) = names(i)) And
(Array.IndexOf(dups, names(i)) = -1) Then
dups(n) = names(i)
n += 1
End If
Next
If n = 0 Then
lstOutput.Items.Add("No duplicates.")
Else
For i As Integer = 0 To n - 1
lstOutput.Items.Add(dups(i))
Next
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 169 of 443)
48. Private Sub btnEvaluate_Click(...) Handles btnEvaluate.Click
Dim strGrades() As String = IO.File.ReadAllLines("Final.txt")
Dim grades(strGrades.Count - 1) As Double
Dim ave As Double
Dim counter As Integer
For i As Integer = 0 To grades.Count - 1
grades(i) = CDbl(strGrades(i))
Next
ave = grades.Average
txtAverage.Text = ave.ToString("N")
For i As Integer = 0 To grades.Count - 1
If grades(i) > ave Then
counter += 1
End If
Next
txtAboveAve.Text = (counter / grades.Count).ToString("P")
End Sub
49. Function Sum(nums() As Integer) As Integer
Dim total As Integer = 0
For i As Integer = 1 To nums.Count - 1 Step 2
total += nums(i)
Next
Return total
End Function
50. Function AreSame(a() As Integer, b() As Integer) As Boolean
If a.Count <> b.Count Then
Return False
Else
For i As Integer = 0 To a.Count - 1
If a(i) <> b(i) Then
Return False
End If
Next
End If
Return True
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 170 of 443)
51. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim lines() As String = IO.File.ReadAllLines("Sonnet.txt")
Dim n = lines.Count - 1
Dim numWords(n) As Integer
For i As Integer = 0 To n
numWords(i) = lines(i).Split(" "c).Count
Next
lstOutput.Items.Add("Average number of words per line: " &
(numWords.Average).ToString("N2"))
lstOutput.Items.Add("Total number of words: " & numWords.Sum)
End Sub
52. Private Sub btnDisplay_Click( ...) Handles btnDisplay.Click
Dim states() As String = IO.File.ReadAllLines("States.txt")
Dim newStates(50) As String
Dim n As Integer = 0
For Each state As String In states
If state.StartsWith("New") Then
newStates(n) = state
n += 1
End If
Next
If n > 0 Then
ReDim Preserve newStates(n - 1)
End If
For Each state As String In newStates
lstOutput.Items.Add(state)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 171 of 443)
53. Private Sub btnProcessEggs_Click(...) Handles btnProcessEggs.Click
Dim heaviest, lightest, ounces As Double
Dim jumbo, xLarge, large, med, small As Integer
heaviest = 0
'can be any number lower than lightest egg
lightest = 100 'can be any number greater than heaviest egg
Dim strEggs() As String = IO.File.ReadAllLines("Eggs.txt")
Dim eggs(strEggs.Count - 1) As Double
For i As Integer = 0 To (eggs.Count – 1)
eggs(i) = CDbl(strEggs(i))
Next
For i As Integer = 0 To (eggs.Count – 1)
ounces = eggs(i)
If ounces > heaviest Then
heaviest = ounces
End if
If ounces < lightest Then
lightest = ounces
End If
Select Case ounces
Case Is < 1.5
'too small & cannot be sold
Case Is < 1.75
small += 1
Case Is < 2
med += 1
Case Is < 2.25
large += 1
Case Is < 2.5
xLarge += 1
Case Else
jumbo += 1
End Select
Next
lstOutput.Items.Clear()
lstOutput.Items.Add(jumbo & " Jumbo eggs")
lstOutput.Items.Add(xLarge & " Extra Large eggs")
lstOutput.Items.Add(large & " Large eggs")
lstOutput.Items.Add(med & " Medium eggs")
lstOutput.Items.Add(small & " Small eggs")
If lightest <> 100 Then
lstOutput.Items.Add("Lightest egg: " & lightest & " ounces")
lstOutput.Items.Add("Heaviest egg: " & heaviest & " ounces")
Else
lstOutput.Items.Add("File is empty")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 172 of 443)
54. Private Sub btnCalculate_Click( ...) Handles btnCalculate.Click
Dim numbers() As String = IO.File.ReadAllLines("Data.txt")
Dim nums(numbers.Count - 1) As Double
For i As Integer = 0 To nums.Count - 1
nums(i) = CDbl(numbers(i))
Next
Dim max As Double = nums(0)
Dim min As Double = nums(0)
For Each num As Double In nums
If num > max Then
max = num
End If
If num < min Then
min = num
End If
txtRange.Text = CStr(max - min)
Dim m As Double = nums.Average 'mean
txtMean.Text = m.ToString("N3")
Dim devs(nums.Count - 1) As Double
For i As Integer = 0 To nums.Count - 1
devs(i) = (nums(i) - m) ^ 2
Next
txtStDev.Text = (Math.Sqrt(devs.Average)).ToString("N3")
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 173 of 443)
55. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim strDigits() As String = IO.File.ReadAllLines("Digits.txt")
Dim freq(9) As Integer
For i As Integer = 0 To strDigits.Count - 1
freq(CInt(strDigits(i))) += 1
Next
lstOutput.Items.Add(" Digit Frequency")
For i As Integer = 0 To 9
lstOutput.Items.Add("
" & i & "
" & freq(i))
Next
End Sub
56. Dim pres() As String = IO.File.ReadAllLines("USPres.txt") 'Holds pres. names
Private Sub btnDisplayPres_Click( ...) Handles btnDisplayPres.Click
'Display the presidents between two numbers, inclusive
lstPres.Items.Clear()
'Loop from the lower number to the higher number
For i As Integer = CInt(txtLowerNum.Text) To CInt(txtUpperNum.Text)
lstPres.Items.Add(i & ". " & pres(i - 1))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 174 of 443)
57. Dim colors() As String = IO.File.ReadAllLines("Colors.txt")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim letter As String = mtbLetter.Text.ToUpper
'mask is L
lstColors.Items.Clear()
For Each hue As String In colors
If hue.StartsWith(letter) Then
lstColors.Items.Add(hue)
End If
Next
End Sub
58. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim colors() As String = IO.File.ReadAllLines("Colors.txt")
Dim n As Integer = colors.Count - 1
For i As Integer = n To 0 Step -1
lstOutput.Items.Add(colors(i))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 175 of 443)
59. Dim colors() As String = IO.File.ReadAllLines("Colors.txt")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim letter As String = mtbLetter.Text.ToUpper
'mask L
lstColors.Items.Clear()
For Each hue As String In SmallerArray(letter)
lstColors.Items.Add(hue)
Next
End Sub
Function SmallerArray(letter As String) As String()
Dim smArray(colors.Count - 1) As String
Dim counter As Integer = 0
For Each hue As String In colors
If hue.StartsWith(letter) Then
smArray(counter) = hue
counter += 1
End If
Next
ReDim Preserve smArray(counter - 1)
Return smArray
End Function
60. Dim colors() As String = IO.File.ReadAllLines("Colors.txt")
Private Sub frmColors_Load( ...) Handles MyBase.Load
For i As Integer = 0 To colors.Count - 1
colors(i) = colors(i).ToUpper
Next
End Sub
Private Sub btnDetermine_Click( ...) Handles btnDetermine.Click
Dim color As String = txtColor.Text.ToUpper
If IsCrayola(color) Then
txtOutcome.Text = "YES"
Else
txtOutcome.Text = "NO"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 176 of 443)
Function IsCrayola(color As String) As Boolean
If Array.IndexOf(colors, color) = -1 Then
Return False
Else
Return True
End If
End Function
61. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim ages(43), numPres As Integer
Dim temp() As String = IO.File.ReadAllLines("AgesAtInaugural.txt")
For i As Integer = 0 To 43
ages(i) = CInt(temp(i))
If ages(i) < 50 Then
numPres += 1
End If
Next
txtNumber.Text = CStr(numPres)
End Sub
62. Private Sub btnScores_Click( ...) Handles btnScores.Click
'Read data from a file and display their frequencies
Dim scores() As String = IO.File.ReadAllLines("Scores.txt")
Dim frequencies(4) As Integer
'Stores the results
For i As Integer = 0 To scores.Count - 1
'Increment the frequency element that belongs to the number
'Divide by 10, and get the integer part.
frequencies(CInt(Int(CInt(scores(i)) / 10))) += 1
Next
lstOutput.Items.Add("Interval" & "
" & "Frequency")
lstOutput.Items.Add("0 to 9" & "
" & frequencies(0))
For i As Integer = 1 To 4
lstOutput.Items.Add((i * 10) & " to " &
((i + 1) * 10) - 1 & "
" & frequencies(i))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 177 of 443)
63. Dim grades(99) As Integer
Dim numGrades As Integer
'stores grades
'number of grades stored
Private Sub btnRecord_Click(...) Handles btnRecord.Click
'Add a score to the array
'If no more room, then display error message.
If numGrades >= 100 Then
MessageBox.Show("100 scores have been entered.", "No more room.")
Else
grades(numGrades) = CInt(txtScore.Text)
numGrades += 1
lstOutput.Items.Clear()
txtScore.Clear()
txtScore.Focus()
End If
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display average of grades and the number of above average grades
Dim temp() As Integer = grades
ReDim Preserve temp(numGrades - 1)
lstOutput.Items.Clear()
lstOutput.Items.Add("The average grade is " &
(temp.Average).ToString("N2") & ".")
lstOutput.Items.Add(NumAboveAverage(temp) &
" students scored above the average.")
End Sub
Function NumAboveAverage(temp() As Integer) As Integer
'Count the number of scores above the average grade
Dim avg As Double = temp.Average
Dim num As Integer = 0
For Each grade In temp
If grade > avg Then
num += 1
End If
Next
Return num
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 178 of 443)
64. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
'Determine whether the sentence is a word palindrome
Dim sentence = txtSentence.Text.ToUpper
sentence = sentence.Replace(".", "")
'Delete any periods
sentence = sentence.Replace(",", "")
'Delete any commas
sentence = sentence.Replace(";", "")
'Delete any semicolons
sentence = sentence.Replace(":", "")
'Delete any colons
Dim words() As String = sentence.Split(" "c)
If WordPalindrome(words) Then
txtResult.Text = "Word palindrome"
Else
txtResult.Text = "Not a word palindrome."
End If
End Sub
Function WordPalindrome(words() As String) As Boolean
'Analyze an array of words to see if it came from a word palindrome
Dim numWords As Integer = words.Count
Dim ub As Integer = words.Count - 1
For i As Integer = 0 To ((numWords \ 2) - 1)
If words(i).ToUpper <> words(ub - i).ToUpper Then
Return False
End If
Next
Return True
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 179 of 443)
65. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
If IsChainLink(txtSentence.Text) Then
txtOutput.Text = "This sentence is a chain-link sentence."
Else
txtOutput.Text = "This sentence is not a chain-link sentence."
End If
End Sub
Function IsChainLink(sentence As String) As Boolean
sentence = sentence.Replace(",", "")
'Delete any commas.
sentence = sentence.Replace(":", "")
'Delete any colons.
sentence = sentence.Replace(";", "")
'Delete any semicolons.
Dim words() As String = sentence.Split(" "c), ending As String = ""
For i As Integer = 0 To words.Count - 2
If (words(i).Length < 2) Or (words(i + 1).Length < 2) Then
Return False
'If any word has is less than two letters.
End If
ending = words(i).Substring(words(i).Length - 2).ToUpper
If ending <> words(i + 1).Substring(0, 2).ToUpper Then
Return False
'If ending does not match beginning of next word.
End If
Next
Return True 'If all words are ok, then it is a chain-link sentence.
End Function
66. Dim days(6) As String
Dim dt As Date = #1/1/2017# 'Sunday
For i As Integer = 0 To 6
days(i) = dt.ToString("D").Substring(0, 3)
dt = dt.AddDays(1)
Next
67. Dim mnths(11) As String
Dim dt As Date = #1/1/2017#
For i As Integer = 0 To 11
Dim n As Integer
n = dt.ToString("D").IndexOf(",")
mnths(i) = dt.ToString("D").Substring(n + 2, 3)
dt = dt.AddMonths(1)
Next
EXERCISES 7.2
1. 5
7
7. 103
2. Houston
have
8. RACECAR
KAYAK
3. going
offer
can't
9. 8
4. 1492
1776
5. 6
10. Upscale
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6. 9
Instructor Solutions Manual (Page 180 of 443)
11. 3 students have a grade of 100
13. 15
12
12. UNSAVORY
14. events
Course
15. The average after dropping the lowest grade is 80
16. 274
278
279
Ramera
Funk
McNulty
17. 37 is a prime number
18. New York is not in New England.
19. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim nums() As Integer = {3, 5, 8, 10, 21}
Dim query = From num In nums
Where num Mod 2 = 0
Select num
txtOutput.Text = query.count & " even numbers"
End Sub
20. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim words() As String = {"When", "in", "the", "course",
"of", "human", "events"}
Dim query = From word In words
Where word.Length = 5
Select word
If query.Count > 0 Then
txtOutput.Text = "at least one five-letter word"
Else
txtOutput.Text = "no five-letter words"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 181 of 443)
21. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim dates() As String = IO.File.ReadAllLines("Dates.txt")
Dim query = From yr In dates
Where (CInt(yr) >= 1800) And (CInt(yr) <= 1899)
Select yr
If query.Count > 0 Then
txtOutput.Text = "contains a 19th century date"
Else
txtOutput.Text = "does not contains a 19th century date"
End If
End Sub
22. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim dates() As String = IO.File.ReadAllLines("Dates.txt")
Dim query = From yr In dates
Where (CInt(yr) >= 1900)
Select yr
txtOutput.Text = query.Count & " twentieth century dates"
End Sub
23. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim nums() As Integer = {2, 6, 4}
Dim query = From num In nums
Order By Array.IndexOf(nums, num) Descending
For Each num As Integer In query
lstOutput.Items.Add(num)
Next
End Sub
24. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim speech() As String = {"Four", "score", "and",
"seven", "years", "ago"}
Dim query = From word In speech
Select word.ToUpper
speech = query.ToArray
txtOutput.Text = speech(3)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 182 of 443)
25. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim teams() As String = IO.File.ReadAllLines("SBWinners.txt")
Dim query = From team In teams
Order By team Ascending
Distinct
For Each team As String In query
lstOutput.Items.Add(team)
Next
End Sub
26. Dim teams() As String = IO.File.ReadAllLines("SBWinners.txt")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From team In teams
Order By NumberOfWins(team) Descending, team Ascending
Select NumberOfWins(team) & " " & team
Distinct
For Each result As String In query
lstOutput.Items.Add(result)
Next
End Sub
Function NumberOfWins(club As String) As Integer
Dim query = From team In teams
Where team = club
Select team
Return query.Count
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 183 of 443)
27. Dim teamNames() As String = IO.File.ReadAllLines("SBWinners.txt")
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Display the number of Super Bowls won by the team in the text box
Dim query = From team In teamNames
Where team.ToUpper = txtName.Text.ToUpper
Select team
txtNumWon.Text = CStr(query.Count)
End Sub
28. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim teams() As String = IO.File.ReadAllLines("SBWinners.txt")
Dim query = From team In teams
Where team.StartsWith("B")
Order By team Ascending
Distinct
For Each team As String In query
lstOutput.Items.Add(team)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 184 of 443)
29. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim word1 As String = txtFirstWord.Text
Dim word2 As String = txtSecondWord.Text
If AreAnagrams(word1, word2) Then
txtOutput.Text = "ARE ANAGRAMS"
Else
txtOutput.Text = "NOT ANAGRAMS"
End If
End Sub
Function AreAnagrams(word1 As String, word2 As String) As Boolean
If word1.Length <> word2.Length Then
Return False
Else
Dim n = word1.Length - 1
Dim w1(n), w2(n) As String
For i As Integer = 0 To n
w1(i) = word1.Substring(i, 1)
w2(i) = word2.Substring(i, 1)
Next
Dim query1 = From letter In w1
Order By letter
Select letter.ToUpper
Dim query2 = From letter In w2
Order By letter
Select letter.ToUpper
For i As Integer = 0 To n
If query1.ToArray(i) <> query2.ToArray(i) Then
Return False
End If
Next
Return True
End If
End Function
30. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query1 = From grade In IO.File.ReadAllLines("Final.txt")
Select CInt(grade)
Dim avg As Double = query1.Average
Dim query2 = From grade In IO.File.ReadAllLines("Final.txt")
Where CInt(grade) > avg
Select grade
txtAverage.Text = avg.ToString("N")
txtAboveAve.Text = (query2.Count / query1.Count).ToString("P")
End Sub
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Instructor Solutions Manual (Page 185 of 443)
31. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim grades(4) As Integer
For i As Integer = 0 To 4
grades(i) = CInt(InputBox("Enter grade #" & (i + 1), "Grades"))
Next
Dim query = From grade In grades
Order By grade Descending
Select grade
grades = query.ToArray
ReDim Preserve grades(2) 'lop off lowest two grades
txtOutput.Text = CStr(grades.Average)
End Sub
32. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim n As Integer = CInt(InputBox("Enter a positive integer."))
Dim nums(n - 1) As Double
For i As Integer = 0 To (n – 1)
nums(i) = CDbl(InputBox("Enter a measurement."))
Next
txtMedian.Text = CStr(Median(nums))
End Sub
Function Median(grades() As Double) As Double
'Use LINQ to sort the grades
Dim query = From grade In grades
Order By grade Ascending
Select grade
grades = query.ToArray
'grades have been sorted
Dim n As Integer
If (grades.Count Mod 2 <> 0) Then 'case where grades.Count is odd
n = CInt((grades.Count - 1) / 2)
Return grades(n)
Else
'case where grades.count is even
n = CInt((grades.Count / 2) - 1)
Return (grades(n) + grades(n + 1)) / 2
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 186 of 443)
33. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim states() As String = IO.File.ReadAllLines("States.txt")
ReDim Preserve states(12)
Dim query = From state In states
Order By state
Select state
For Each state As String In query
lstOutput.Items.Add(state)
Next
End Sub
34. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From pres In IO.File.ReadAllLines("USPres.txt")
Let lastName = pres.Split(" "c).Last
Order By lastName
Select pres
For Each pres As String In query
lstOutput.Items.Add(pres)
Next
Distinct
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 187 of 443)
35. Dim nations() As String = IO.File.ReadAllLines("Nations.txt")
Private Sub frmNations_Load(...) Handles MyBase.Load
lstNations.DataSource = nations
lstNations.SelectedItem = Nothing
End Sub
Private Sub txtNations_TextChanged(...) Handles txtNation.TextChanged
Dim query = From nation In nations
Where nation.StartsWith(txtNation.Text)
Select nation
lstNations.DataSource = query.ToList
lstNations.SelectedItem = Nothing
End Sub
Private Sub lstNations_Click(...) Handles lstNations.Click
txtNation.Text = lstNations.Text
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 188 of 443)
36. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From word In IO.File.ReadAllLines("Words.txt")
Let vowels = NumberOfVowels(word.ToUpper)
Order By vowels Descending, word.Length Descending,word Ascending
Select vowels & " " & word
For Each item As String In query
lstOutput.Items.Add(item)
Next
End Sub
Function NumberOfVowels(word As String) As Integer
Dim num As Integer = 0
If word.IndexOf("A") <> -1 Then
num += 1
End If
If word.IndexOf("E") <> -1 Then
num += 1
End If
If word.IndexOf("I") <> -1 Then
num += 1
End If
If word.IndexOf("O") <> -1 Then
num += 1
End If
If word.IndexOf("U") <> -1 Then
num += 1
End If
Return num
End Function
Private Sub lstNations_Click(...) Handles lstNations.Click
txtNation.Text = lstNations.Text
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 189 of 443)
37. Private Sub btnSort_Click(...) Handles btnSort.Click
'ListBox1.Sorted = True
Dim n As Integer = lstOriginalList.Items.Count - 1
Dim numbers(n) As Integer
For i As Integer = 0 To n
numbers(i) = CInt(lstOriginalList.Items(i))
Next
Array.Sort(numbers)
For i = 0 To n
lstSortedList.Items.Add(numbers(i))
Next
End Sub
38. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim lines() As String = IO.File.ReadAllLines("Sonnet.txt")
Dim n = lines.Count - 1
Dim words() As String
Dim numWords As Integer
For i As Integer = 0 To n
words = lines(i).Split(" "c)
For j = 0 To words.Count - 1
words(j) = words(j).ToLower
words(j) = StripEndPunctuation(words(j))
lstOutput.Items.Add(words(j))
Next
Next
numWords = lstOutput.Items.Count
Dim wordsArray(numWords - 1) As String
For i As Integer = 0 To numWords - 1
wordsArray(i) = CStr(lstOutput.Items(i))
Next
Dim wordQuery = From word In wordsArray
Distinct
txtAnswer.Text = CStr(wordQuery.Count)
End Sub
Function StripEndPunctuation(word As String) As String
Dim character As String
character = word.Substring(Len(word) - 1)
If Asc(character) >= 97 And Asc(character) <= 122 Then
Return word
Else
Return word.Substring(0, Len(word) - 1)
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 190 of 443)
39. Private Sub btnFind_Click(...) Handles btnDisplay.Click
Dim states() As String = IO.File.ReadAllLines("StatesBFNC.txt")
Dim data(3), line, flowers(49) As String
For i As Integer = 0 To (states.Count - 1)
line = states(i)
data = line.Split(","c)
flowers(i) = data(2)
Next
Dim query = From flr In flowers
Order By flr.Length Ascending
Select flr
Distinct
lstFlowers.DataSource = query.ToArray
lstFlowers.SelectedIndex = -1
txtNumber.Text = CStr(lstFlowers.Items.Count)
End Sub
40. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim states() As String = IO.File.ReadAllLines("StatesBFNC.txt")
Dim query = From st In states
Let data = st.Split(","c)
Where data(4).Substring(0, 1) = data(0).Substring(0, 1)
Order By st Ascending
Select data(4) & ", " & data(0)
lstResults.DataSource = query.ToList
lstResults.SelectedItem = Nothing
End Sub
EXERCISES 7.3
1. The area of a football field is 19200 square yards.
2. USC is 133 years old.
(answers will vary; age in 2013 was 133)
3. Duke was founded in NC in 1838.
4. Stanford was founded in CA in 1885.
5. heights are same
170
6. Wage for John Q. Public: $1,100.00
7. Joe: 88
Moe: 90
Roe: 95
8. Not eligible to participate in the health plan.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 191 of 443)
9. Mr. President lives in Washington, DC
10. Hannah Jones earned $800.00
11. In the event procedure, peace should be prize.peace and yr should be prize.yr.
12. The statement lstOutput.Items.Add(minimum) should be replaced with either
lstOutput.Items.Add(minimum.a) or lstOutput.Items.Add(minimum.b), or both.
13. The condition (game1 > game2) is not valid. Structures can only be compared one field at a
time.
14. person1.name = "Michael"
person1.stats.height = 71
person1.stats.weight = 190
person2.name = "Jacob"
person2.stats.height = 70
person2.stats.weight = 175
If (person1.stats.height > person2.stats.height) And
(person1.stats.weight > person2.stats.weight) Then
txtOutput.Text = person1.name & " is bigger than " & person2.name
End If
15. The cities in Texas, along with their populations. The cities are ordered by the sizes of their
populations beginning with the most populous city.
16. The cities in Texas, along with their population growth from 2000 2010. The cities are
ordered by the magnitude of their growths beginning with the city experiencing the greatest
growth. Then the greatest population growth of these cites is displayed.
17. The population growth of Phoenix from 2000 to 2010.
18. The sum of the populations of the ten largest cities.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 192 of 443)
19. Structure State
Dim name As String
Dim abbreviation As String
Dim area As Double
Dim pop As Double
End Structure
Dim states() As State
Private Sub frmStates_Load(...) Handles MyBase.Load
Dim stateRecords() As String = IO.File.ReadAllLines("USStates.txt")
Dim n As Integer = stateRecords.Count - 1
ReDim states(n)
Dim line As String
Dim data() As String
For i As Integer = 0 To n
line = stateRecords(i)
data = line.Split(","c)
states(i).name = data(0)
states(i).abbreviation = data(1)
states(i).area = CDbl(data(2))
states(i).pop = CDbl(data(3))
Next
End Sub
Private Sub btnFind_Click(...) Handles btnFind.Click
Dim stateAbbr As String = mtbAbbrev.Text.ToUpper
Dim query = From state In states
Where state.abbreviation = stateAbbr
Select state.name, state.area
txtOutput.Text = "The area of " & query.First.name & " is " &
(query.First.area).ToString("N0") & " sq. miles."
End Sub
20. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From line In IO.File.ReadAllLines("USStates.txt")
Let name = line.Split(","c)(0).ToUpper
Let abbrev = line.Split(","c)(1)
Where Not name.StartsWith(abbrev)
Order By name Ascending
Select abbrev, name
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("abbrev").HeaderText = "State Abbreviation"
dgvOutput.Columns("name").HeaderText = "State"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 193 of 443)
21. Structure State
Dim name As String
Dim abbreviation As String
Dim area As Double
Dim pop As Double
End Structure
Dim states() As State
Private Sub frmStates_Load(...) Handles MyBase.Load
Dim stateRecords() As String = IO.File.ReadAllLines("USStates.txt")
Dim n As Integer = stateRecords.Count - 1
ReDim states(n)
Dim line As String
Dim data() As String
For i As Integer = 0 To n
line = stateRecords(i)
data = line.Split(","c)
states(i).name = data(0)
states(i).abbreviation = data(1)
states(i).area = CDbl(data(2))
states(i).pop = CDbl(data(3))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From state In states
Let density = state.pop / state.area
Let formattedDensity = density.ToString("N2")
Order By density Descending
Select state.name, formattedDensity
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "State"
dgvOutput.Columns("formattedDensity").HeaderText =
"People per Square Mile"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 194 of 443)
22. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim states() As String = IO.File.ReadAllLines("USStates.txt")
Dim query1 = From line In states
Let area = CInt(line.Split(","c)(2))
Select area
Dim totalArea = query1.Sum
Dim query2 = From line In states
Let name = line.Split(","c)(0)
Let area = CInt(line.Split(","c)(2))
Let percentArea = (area / totalArea).ToString("P")
Order By area Descending
Select name, percentArea
dgvOutput.DataSource = query2.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "State"
dgvOutput.Columns("percentArea").HeaderText = "Percentage of Total Area"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 195 of 443)
23. Structure Player
Dim name As String
Dim team As String
Dim atBats As Integer
Dim hits As Integer
End Structure
Dim players() As Player
Private Sub frmBaseball_Load(...) Handles MyBase.Load
Dim playerStats() As String = IO.File.ReadAllLines("Baseball.txt")
Dim n As Integer = playerStats.Count - 1
ReDim players(n)
Dim line As String
Dim data() As String
For i As Integer = 0 To n
line = playerStats(i)
data = line.Split(","c)
players(i).name = data(0)
players(i).team = data(1)
players(i).atBats = CInt(data(2))
players(i).hits = CInt(data(3))
Next
Dim query = From person In players
Order By person.team Ascending
Select person.team
Distinct
lstTeams.DataSource = query.ToList
End Sub
Private Sub lstTeams_SelectedIndexChanged(...) Handles _
lstTeams.SelectedIndexChanged
Dim selectedTeam = lstTeams.Text
Dim query = From person In players
Where person.team = selectedTeam
Order By person.hits Descending
Select person.name, person.hits
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Player"
dgvOutput.Columns("hits").HeaderText = "Hits"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 196 of 443)
24. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From line In IO.File.ReadAllLines("Baseball.txt")
Let team = line.Split(","c)(1)
Order By team Ascending
Select team
Distinct
lstOutput.DataSource = query.ToList
lstOutput.SelectedItem = Nothing
End Sub
25. Structure Player
Dim name As String
Dim team As String
Dim atBats As Integer
Dim hits As Integer
End Structure
Dim players() As Player
Private Sub frmBaseball_Load(...) Handles MyBase.Load
Dim playerStats() As String = IO.File.ReadAllLines("Baseball.txt")
Dim n As Integer = playerStats.Count - 1
ReDim players(n)
Dim line As String
Dim data() As String
For i As Integer = 0 To n
line = playerStats(i)
data = line.Split(","c)
players(i).name = data(0)
players(i).team = data(1)
players(i).atBats = CInt(data(2))
players(i).hits = CInt(data(3))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From person In players
Let ave = person.hits / person.atBats
Select ave
Dim best As Double = query.Max
txtBestAverage.Text = best.ToString("N3")
Dim query2 = From person In players
Where person.hits / person.atBats = best
Select person.name, person.team
dgvOutput.DataSource = query2.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Player"
dgvOutput.Columns("team").HeaderText = "Team"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 197 of 443)
26. Dim baseball() As String = IO.File.ReadAllLines("Baseball.txt")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From line In baseball
Let fullName = line.Split(","c)(0)
Let team = line.Split(","c)(1)
Let atBats = CInt(line.Split(","c)(2))
Let hits = CInt(line.Split(","c)(3))
Let firstName = fullName.Split(" "c).First
Let lastName = fullName.Split(" "c).Last
Let ave = (hits / atBats).ToString("N3").Substring(1, 4)
Where team.ToUpper = txtTeam.Text.ToUpper
Order By lastName, firstName
Select fullName, ave
dgvPlayers.DataSource = query.ToList
dgvPlayers.CurrentCell = Nothing
dgvPlayers.Columns("fullName").HeaderText = "PLAYER"
dgvPlayers.Columns("ave").HeaderText = "BATTING AVERAGE"
End Sub
27. Structure Pioneer
Dim name As String
Dim accomplishment As String
End Structure
Dim pioneers() As Pioneer
Private Sub frmPioneers_Load() Handles MyBase.Load
'Place the data for each college into the array schools.
Dim people() = IO.File.ReadAllLines("Pioneers.txt")
Dim n As Integer = people.Count - 1
ReDim pioneers(n)
Dim line As String 'holds data for a single college
Dim data() As String
For i As Integer = 0 To n
line = people(i)
data = line.Split(","c)
pioneers(i).name = data(0)
pioneers(i).accomplishment = data(1)
lstPioneers.Items.Add(pioneers(i).name)
Next
End Sub
Private Sub lstPioneers_SelectedIndexChanged(...) Handles _
lstPioneers.SelectedIndexChanged
txtAccomplishment.Text = pioneers(lstPioneers.SelectedIndex).accomplishment
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 198 of 443)
28. Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Private Sub frmJustices_Load(...) Handles MyBase.Load
Dim query = From pres In IO.File.ReadAllLines("USPres.txt")
Select pres
For Each president In query
lstPres.Items.Add(president)
Next
End Sub
Private Sub lstPres_SelectedIndexChanged(...) Handles _
lstPres.SelectedIndexChanged
Dim query = From line In justices
Let firstName = line.Split(","c)(0)
Let lastName = line.Split(","c)(1)
Let pres = line.Split(","c)(2)
Let yrAppointed = CInt(line.Split(","c)(4))
Let yrLeft = CInt(line.Split(","c)(5))
Let yrs = YearsServed(yrAppointed, yrLeft)
Where pres = lstPres.Text
Order By yrs Descending
Select firstName & " " & lastName
lstOutput.DataSource = query.ToList
lstOutput.SelectedItem = Nothing
End Sub
Function YearsServed(enter As Integer,leave As Integer) As Integer
If leave = 0 Then
Return (Now.Year - enter)
Else
Return (leave - enter)
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 199 of 443)
29. Structure Justice
Dim firstName As String
Dim lastName As String
Dim apptPres As String
Dim state As String
'state abbreviation
Dim yrAppointed As Integer
Dim yrLeft As Integer
End Structure
Dim justices() As Justice
Private Sub frmJustices_Load(...) Handles MyBase.Load
Dim justiceRecords() As String = IO.File.ReadAllLines("Justices.txt")
Dim n As Integer = justiceRecords.Count - 1
ReDim justices(n)
Dim line As String
Dim data() As String
For i As Integer = 0 To n
line = justiceRecords(i)
data = line.Split(","c)
justices(i).firstName = data(0)
justices(i).lastName = data(1)
justices(i).apptPres = data(2)
justices(i).state = data(3)
justices(i).yrAppointed = CInt(data(4))
justices(i).yrLeft = CInt(data(5))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From person In justices
Where person.yrLeft = 0
Order By person.yrAppointed
Select person.firstName & " " & person.lastName
lstOutput.DataSource = query.ToList
lstOutput.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 200 of 443)
30. Private Sub btnDisolay_Click(...) Handles btnDisolay.Click
Dim query = From line In IO.File.ReadAllLines("Justices.txt")
Let data = line.Split(","c)
Let firstName = data(0)
Let lastName = data(1)
Let pres = data(2)
Let yrAppointed = CInt(data(4))
Let yrLeft = CInt(data(5))
Let fullName = firstName & " " & lastName
Where (yrLeft >= 1980) And (yrAppointed < 1980)
Order By yrAppointed
Select fullName, pres
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("fullName").HeaderText = "Justice"
dgvOutput.Columns("pres").HeaderText = "Appointing President"
End Sub
31. Structure Justice
Dim firstName As String
Dim lastName As String
Dim apptPres As String
Dim state As String 'state abbreviation
Dim yrAppointed As Integer
Dim yrLeft As Integer
End Structure
Dim justices() As Justice
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 201 of 443)
Private Sub frmJustices_Load(...) Handles MyBase.Load
Dim justiceRecords() As String = IO.File.ReadAllLines("Justices.txt")
Dim n As Integer = justiceRecords.Count - 1
ReDim justices(n)
Dim line As String
Dim data() As String
For i As Integer = 0 To n
line = justiceRecords(i)
data = line.Split(","c)
justices(i).firstName = data(0)
justices(i).lastName = data(1)
justices(i).apptPres = data(2)
justices(i).state = data(3)
justices(i).yrAppointed = CInt(data(4))
justices(i).yrLeft = CInt(data(5))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From person In justices
Where person.state = mtbState.Text
Let fullName = person.firstName & " " & person.lastName
Let yrs = YearsServed(person.yrAppointed, person.yrLeft)
Let presLastName = person.apptPres.Split(" "c).Last
Order By person.yrAppointed
Select fullName, presLastName, yrs
If query.Count = 0 Then
MessageBox.Show("No justices appointed from that state.", "NONE")
mtbState.Focus()
Else
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("fullName").HeaderText = "Justice"
dgvOutput.Columns("presLastName").HeaderText = "Appointing President"
dgvOutput.Columns("yrs").HeaderText = "Years Served"
End If
End Sub
Function YearsServed(enter As Integer, leave As Integer) As Integer
If leave = 0 Then
Return (Now.Year - enter)
Else
Return (leave - enter)
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 202 of 443)
32. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim people() As String = IO.File.ReadAllLines("SportsStars.txt")
Dim query = From person In people
Let data = person.Split(","c)
Let name = data(0)
Let d = CDate(data(3))
Where d.ToString("D").StartsWith("Sunday")
Select name
lstOutput.DataSource = query.ToList
lstOutput.SelectedItem = Nothing
End Sub
33. Structure FamousPerson
Dim name As String
Dim sport As String
Dim nickname As String
Dim dateOfBirth As Date
End Structure
Dim famousPersons() As FamousPerson
Private Sub frmFamous_Load(...) Handles MyBase.Load
Dim people() As String = IO.File.ReadAllLines("SportsStars.txt")
Dim n As Integer = people.Count - 1
ReDim famousPersons(n)
Dim line As String
Dim data(3) As String
For i As Integer = 0 To n
line = people(i)
data = line.Split(","c)
famousPersons(i).name = data(0)
famousPersons(i).dateOfBirth = CDate(data(3))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From person In famousPersons
Where (person.dateOfBirth >= #1/1/1940#) And
(person.dateOfBirth < #1/1/1950#)
Select person.name
lstOutput.DataSource = query.ToList
lstOutput.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 203 of 443)
34. Structure Person
Dim name As String
Dim sport As String
Dim nickname As String
Dim dateOfBirth As Date
End Structure
Dim people() As Person
Private Sub frmFamous_Load(...) Handles MyBase.Load
'Place the data for each person into the array people.
Dim group() As String = IO.File.ReadAllLines("SportsStars.txt")
Dim n As Integer = group.Count - 1
ReDim people(n)
Dim data() As String
For i As Integer = 0 To n
data = group(i).Split(","c)
people(i).name = data(0)
people(i).sport = data(1)
people(i).nickname = data(2)
people(i).dateOfBirth = CDate(data(3))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From individual In people
Order By individual.dateOfBirth Ascending
Select individual.name, individual.sport, individual.nickname,
individual.dateOfBirth
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Name"
dgvOutput.Columns("sport").HeaderText = "Sport"
dgvOutput.Columns("nickname").HeaderText = "Nickname"
dgvOutput.Columns("dateOfBirth").HeaderText = "Birth Date"
dgvOutput.CurrentCell = Nothing
End Sub
35. Structure Person
Dim name As String
Dim sport As String
Dim nickname As String
Dim dateOfBirth As Date
End Structure
Dim people() As Person
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 204 of 443)
Private Sub frmFamous_Load(...) Handles MyBase.Load
'Place the data for each person into the array people.
Dim group() As String = IO.File.ReadAllLines("SportsStars.txt")
Dim n As Integer = group.Count - 1
ReDim people(n)
Dim data() As String
For i As Integer = 0 To n
data = group(i).Split(","c)
people(i).name = data(0)
people(i).nickname = data(2)
people(i).dateOfBirth = CDate(data(3))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From individual In people
Let dayOfBirth = DayOfWeek(individual.dateOfBirth)
Where individual.dateOfBirth.AddYears(50) <= Today And
individual.dateOfBirth.AddYears(60) > Today
Select individual.name, individual.nickname, dayOfBirth
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Name"
dgvOutput.Columns("nickname").HeaderText = "Nickname"
dgvOutput.Columns("dayOfBirth").HeaderText = "Day of Birth"
End Sub
Function DayOfWeek(dt As Date) As String
Dim d1 As String = dt.ToString("D")
Dim d2() As String = d1.Split(","c)
Return d2.First
End Function
36. Structure Person
Dim name As String
Dim sport As String
Dim nickname As String
Dim dateOfBirth As Date
End Structure
Dim people() As Person
Private Sub frmFamous_Load(...) Handles MyBase.Load
'Place the data for each person into the array people.
Dim group() As String = IO.File.ReadAllLines("SportsStars.txt")
Dim n As Integer = group.Count - 1
ReDim people(n)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 205 of 443)
Dim data() As String
For i As Integer = 0 To n
data = group(i).Split(","c)
people(i).name = data(0)
people(i).sport = data(1)
people(i).nickname = data(2)
people(i).dateOfBirth = CDate(data(3))
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
lstStars.Items.Clear()
If radBasketball.Checked Then
For Each athlete In people
If athlete.sport = "basketball" Then
lstStars.Items.Add(athlete.name & " (" & athlete.nickname & ")")
End If
Next
End If
If radBaseball.Checked Then
For Each athlete In people
If athlete.sport = "baseball" Then
lstStars.Items.Add(athlete.name & " (" & athlete.nickname & ")")
End If
Next
End If
If radFootball.Checked Then
For Each athlete In people
If athlete.sport = "football" Then
lstStars.Items.Add(athlete.name & " (" & athlete.nickname & ")")
End If
Next
End If
If radGolf.Checked Then
For Each athlete In people
If athlete.sport = "golf" Then
lstStars.Items.Add(athlete.name & " (" & athlete.nickname & ")")
End If
Next
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 206 of 443)
37. Structure Person
Dim name As String
Dim sport As String
Dim nickname As String
Dim dateOfBirth As Date
End Structure
Dim people() As Person
Private Sub frmStars_Load(...) Handles MyBase.Load
'Place the data for each person into the array people.
Dim group() As String = IO.File.ReadAllLines("SportsStars.txt")
Dim n As Integer = group.Count - 1
ReDim people(n)
Dim data() As String
For i As Integer = 0 To n
data = group(i).Split(","c)
people(i).name = data(0)
people(i).sport = data(1)
people(i).nickname = data(2)
people(i).dateOfBirth = CDate(data(3))
lstStars.Items.Add(people(i).name)
Next
End Sub
Private Sub lstStars_SelectedIndexChanged(...) Handles _
lstStars.SelectedIndexChanged
Dim n As Integer
n = lstStars.SelectedIndex
txtSport.Text = CStr(people(n).sport)
txtNickname.Text = CStr(people(n).nickname)
txtBirthDate.Text = (people(n).dateOfBirth).ToString("D")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 207 of 443)
38. Structure PresCollege
Dim name As String
Dim collegeAttended As String
End Structure
Dim presidents() As PresCollege
Private Sub frmPrescolleges_Load(...) Handles MyBase.Load
'Place the data for each president into the array preColl.
Dim presColl() As String = IO.File.ReadAllLines("PresColleges.txt")
Dim n As Integer = presColl.Count - 1
ReDim presidents(n)
Dim line As String 'holds data for a single president
Dim data(1) As String
For i As Integer = 0 To n
line = presColl(i)
data = line.Split(","c)
presidents(i).name = data(0)
presidents(i).collegeAttended = data(1)
Next
Dim query = From pres In presidents
Select pres.collegeAttended
Order By collegeAttended
Distinct
For Each college As String In query
lstColleges.Items.Add(college)
Next
End Sub
Private Sub lstColleges_SelectedIndexChanged(...) Handles _
lstColleges.SelectedIndexChanged
lstPresidents.Items.Clear()
Dim query = From PnC In presidents
Where PnC.collegeAttended = CStr(lstColleges.SelectedItem)
Select PnC.name
For Each pres As String In query
lstPresidents.Items.Add(pres)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 208 of 443)
39. Structure Pictures
Dim name As String
Dim genre As String
End Structure
Dim films() As Pictures
Private Sub frmOscars_Load(...) Handles MyBase.Load
'Place the data for each picture into the array films.
Dim flicks() As String = IO.File.ReadAllLines("Oscars.txt")
Dim n As Integer = flicks.Count - 1
ReDim films(n)
Dim line As String 'holds data for a single film
Dim data(1) As String
For i As Integer = 0 To n
line = flicks(i)
data = line.Split(","c)
films(i).name = data(0)
films(i).genre = data(1)
Next
Dim query = From pic In films
Select pic.genre
Distinct
For Each film As String In query
lstGenre.Items.Add(film)
Next
End Sub
Private Sub lstGenre_SelectedIndexChanged(...) Handles _
lstGenre.SelectedIndexChanged
lstFilms.Items.Clear()
Dim query = From pic In films
Where pic.genre = CStr(lstGenre.SelectedItem)
Select pic.name
For Each film As String In query
lstFilms.Items.Add(film)
Next
End Sub
40. Structure Pictures
Dim name As String
Dim genre As String
End Structure
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 209 of 443)
Dim films() As Pictures
Private Sub frmOscars_Load(...) Handles MyBase.Load
'Place the data for each ppicture into the array films.
Dim flicks() As String = IO.File.ReadAllLines("Oscars.txt")
Dim n As Integer = flicks.Count - 1
ReDim films(n)
Dim line As String 'holds data for a single film
Dim data(1) As String
For i As Integer = 0 To n
line = flicks(i)
data = line.Split(","c)
films(i).name = data(0)
films(i).genre = data(1)
Next
End Sub
Private Sub btnFind_Click(...) Handles btnFind.Click
Dim n As Integer = CInt(txtNumber.Text)
If n >= 1928 And n <= 2014 Then
txtName.Text = films(n - 1928).name
txtGenre.Text = films(n - 1928).genre
Else
MessageBox.Show("Year must be between 1928 and 2014.", "Incorrect Number")
End If
End Sub
41. Structure Stock
Dim company As String
Dim symbol As String
Dim exchange As String
Dim industry As String
Dim price2013 As Decimal
'price at end of 2013
Dim price2014 As Decimal
'price at end of 2014
Dim earningsPerShare As Decimal
Dim dividend As Decimal
End Structure
Dim stocks(29) As Stock
Private Sub frmDOW_Load(...) Handles MyBase.Load
Dim line As String
Dim data(7) As String
Dim securities() As String = IO.File.ReadAllLines("DOW2014.txt")
For i As Integer = 0 To 29
line = securities(i)
data = line.Split(","c)
stocks(i).company = data(0)
stocks(i).symbol = data(1)
stocks(i).exchange = data(2)
stocks(i).industry = data(3)
stocks(i).price2013 = CDec(data(4))
stocks(i).price2014 = CDec(data(5))
stocks(i).earningsPerShare = CDec(data(6))
stocks(i).dividend = CDec(data(7))
lstStocks.Items.Add(stocks(i).symbol)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 210 of 443)
Private Sub lstStocks_SelectedIndexChanged(...) Handles _
lstStocks.SelectedIndexChanged
Dim n As Integer
n = lstStocks.SelectedIndex
txtCompany.Text = stocks(n).company
txtIndustry.Text = stocks(n).industry
txtExchange.Text = stocks(n).exchange
txtGrowth.Text = ((stocks(n).price2014 - stocks(n).price2013) /
stocks(n).price2013).ToString("P")
txtPEratio.Text = (stocks(n).price2014 /
stocks(n).earningsPerShare).ToString("N")
End Sub
42. Structure Stock
Dim company As String
Dim symbol As String
Dim exchange As String
Dim industry As String
Dim price2013 As Decimal
'price at end of 2013
Dim price2014 As Decimal
'price at end of 2014
Dim earningsPerShare As Decimal
Dim dividend As Decimal
End Structure
Dim stocks(29) As Stock
Private Sub frmDOW_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim line As String
Dim data(7) As String
Dim securities() As String = IO.File.ReadAllLines("DOW2014.txt")
For i As Integer = 0 To 29
line = securities(i)
data = line.Split(","c)
stocks(i).company = data(0)
stocks(i).symbol = data(1)
stocks(i).exchange = data(2)
stocks(i).industry = data(3)
stocks(i).price2013 = CDec(data(4))
stocks(i).price2014 = CDec(data(5))
stocks(i).earningsPerShare = CDec(data(6))
stocks(i).dividend = CDec(data(7))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 211 of 443)
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim bestPerformance, worstPerformance, growth As Decimal
growth = (stocks(0).price2014 - stocks(0).price2013) / stocks(0).price2013
bestPerformance = growth
worstPerformance = growth
For i As Integer = 1 To 29
growth = (stocks(i).price2014 - stocks(i).price2013) / stocks(i).price2013
If growth > bestPerformance Then
bestPerformance = growth
End If
If growth < worstPerformance Then
worstPerformance = growth
End If
Next
txtBestGain.Text = bestPerformance.ToString("P")
txtWorstGain.Text = worstPerformance.ToString("P")
For i As Integer = 0 To 29
growth = (stocks(i).price2014 - stocks(i).price2013) / stocks(i).price2013
If growth = bestPerformance Then
lstBest.Items.Add(stocks(i).company)
ElseIf growth = worstPerformance Then
lstWorst.Items.Add(stocks(i).company)
End If
Next
End Sub
43. Structure Stock
Dim company As String
Dim symbol As String
Dim exchange As String
Dim industry As String
Dim price2013 As Decimal
'price at end of 2013
Dim price2014 As Decimal
'price at end of 2014
Dim earningsPerShare As Decimal
Dim dividend As Decimal
End Structure
Dim stocks(29) As Stock
Private Sub frmDOW_Load(...) Handles MyBase.Load
Dim line As String
Dim data(7) As String
Dim securities() As String = IO.File.ReadAllLines("DOW2014.txt")
For i As Integer = 0 To 29
line = securities(i)
data = line.Split(","c)
stocks(i).company = data(0)
stocks(i).symbol = data(1)
stocks(i).exchange = data(2)
stocks(i).industry = data(3)
stocks(i).price2013 = CDec(data(4))
stocks(i).price2014 = CDec(data(5))
stocks(i).earningsPerShare = CDec(data(6))
stocks(i).dividend = CDec(data(7))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 212 of 443)
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim query = From equity In stocks
Let ratio = equity.dividend / equity.price2014
Order By ratio Descending
Let ratioPercent = ratio.ToString("P")
Select equity.company, equity.symbol, ratioPercent
Dim queryAsArray() = query.ToArray
ReDim Preserve queryAsArray(9)
dgvStocks.DataSource = queryAsArray
dgvStocks.Columns("company").HeaderText = "Company"
dgvStocks.Columns("symbol").HeaderText = "Symbol"
dgvStocks.Columns("ratioPercent").HeaderText = "Yield as of 12/31/2014"
dgvStocks.CurrentCell = Nothing
End Sub
44. Structure Stock
Dim company As String
Dim symbol As String
Dim exchange As String
Dim industry As String
Dim price2013 As Decimal
'price at end of 2013
Dim price2014 As Decimal
'price at end of 2014
Dim earningsPerShare As Decimal
Dim dividend As Decimal
End Structure
Dim stocks(29) As Stock
Private Sub frmDOW_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim line As String
Dim data(7) As String
Dim securities() As String = IO.File.ReadAllLines("DOW2014.txt")
For i As Integer = 0 To 29
line = securities(i)
data = line.Split(","c)
stocks(i).company = data(0)
stocks(i).symbol = data(1)
stocks(i).exchange = data(2)
stocks(i).industry = data(3)
stocks(i).price2013 = CDec(data(4))
stocks(i).price2014 = CDec(data(5))
stocks(i).earningsPerShare = CDec(data(6))
stocks(i).dividend = CDec(data(7))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 213 of 443)
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim query = From equity In stocks
Order By equity.price2014 Ascending
Select equity.company, equity.symbol, equity.price2014
Dim queryAsArray() = query.ToArray
ReDim Preserve queryAsArray(4)
dgvStocks.DataSource = queryAsArray
dgvStocks.Columns("company").HeaderText = "Company"
dgvStocks.Columns("symbol").HeaderText = "Symbol"
dgvStocks.Columns("price2014").HeaderText = "Price as of 12/31/2014"
dgvStocks.CurrentCell = Nothing
End Sub
45. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
lstOutput.Items.Clear()
For i As Integer = 0 To club.Count - 1
lstOutput.Items.Add(club(i).name)
Next
End Sub
46. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
lstOutput.Items.Clear()
For i As Integer = 0 To (club.Count – 1)
If club(i).courses.Count = 3 Then
lstOutput.Items.Add(club(i).name)
End If
Next
End Sub
47. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Displays the students who are enrolled in CMSC 100
Dim subject = "CMSC 100"
'Loop over all students in the club
For i As Integer = 0 To (club.Count – 1)
'Loop over all courses for that student
For j As Integer = 0 To (club(i).courses.Count – 1)
'If a course matches, display the student's name.
If club(i).courses(j) = subject Then
lstOutput.Items.Add(club(i).name)
End If
Next
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 214 of 443)
48. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Displays the students who are not enrolled in CMSC 100
Dim subject = "CMSC 100"
Dim ub = club.Count - 1
Dim checkList(ub) As Boolean
For i As Integer = 0 To ub
For j As Integer = 0 To (club(i).courses.Count – 1)
If club(i).courses(j) = subject Then
checkList(i) = True
End If
Next
Next
For i As Integer = 0 To ub
If Not checkList(i) Then
lstOutput.Items.Add(club(i).name)
End If
Next
End Sub
EXERCISES 7.4
1. 1
2. 6
3. 3
4. 2
5. 55
6. 20
7. 14
8. 55
9. 2
10. 10
11. 55
12. 0
1
2
3
4
5
13. Dim twice(2, 3) As Double
For r As Integer = 0 To 2
For c As Integer = 0 To 3
twice(r, c) = 2 * nums(r, c)
Next
Next
14. Dim total As Double = 0
Dim counter As Integer = 0
For Each num In nums
total += num
counter += 1
Next
lstOutput.Items.Add(total / counter)
15. 'use a For Each loop
Dim total As Double = 0
For Each num As Double In nums
If num Mod 2 = 0 Then
total += num
End If
Next
lstOutput.Items.Add(total)
'use LINQ
Dim query = From num In nums.Cast(Of Double)()
Where (num Mod 2 = 0)
Select num
lstOutput.Items.Add(query.Sum)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 215 of 443)
16. 'use a For Each loop
Dim total As Double = 0
Dim counter As Integer = 0
For Each num As Double In nums
If num Mod 2 <> 0 Then
total += num
counter += 1
End If
Next
lstOutput.Items.Add(total / counter)
'use LINQ
Dim query = From num In nums.Cast(Of Double)()
Where (num Mod 2 <> 0)
Select num
lstOutput.Items.Add(query.Average)
17. 12
18. James Madison
19. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim inventory(,) As Integer = {{25, 64, 23}, {30, 82, 19}}
Dim sales(,) As Integer = {{7, 45, 11}, {4, 24, 8}}
Dim total(2) As Integer
'Adjust the inventory values to reflect today's sales
For store As Integer = 1 To 2
For item As Integer = 1 To 3
inventory(store - 1, item - 1) =
inventory(store - 1, item - 1) - sales(store - 1, item - 1)
'Accumulate the total inventory per store
total(store) += inventory(store - 1, item - 1)
Next
Next
lstOutput.Items.Add("
1
2
3
TOTAL")
For store As Integer = 1 To 2
lstOutput.Items.Add(store & "
" & inventory(store - 1, 0) &
"
" & inventory(store - 1, 1) & "
" &
inventory(store - 1, 2) & "
" & total(store))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 216 of 443)
20. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
'Determine average of percentages in Twitter column
Dim percentUse(3, 4) As Double
ReadData(percentUse)
ShowAveragePercentage(percentUse)
End Sub
Sub ReadData(ByRef percentUse(,) As Double)
'Read percentages for each age group
Dim table() As String = IO.File.ReadAllLines("Internet.txt")
Dim data() As String
For age As Integer = 0 To 3
data = table(age).Split(","c)
For use As Integer = 0 To 4
percentUse(age, use) = CDbl(data(use))
Next
Next
End Sub
Sub ShowAveragePercentage(percentUse(,) As Double)
'Determine average of percentages in Twitter column
'(i.e., column corresponding to 1)
Dim sum As Double = 0
For age As Integer = 0 To 3
sum += percentUse(age, 1)
Next
txtAverage.Text = (sum / 400).ToString("P1")
End Sub
21. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim ranking(2, 4) As String
Dim disciplines(2) As String
Dim table() As String = IO.File.ReadAllLines("Ranking.txt")
Dim data() As String
For field As Integer = 0 To 2
data = table(field).Split(","c)
disciplines(field) = data(0)
For rank As Integer = 0 To 4
ranking(field, rank) = data(rank + 1)
Next
Next
Dim result As String = ""
For category As Integer = 0 To 2
For rank As Integer = 0 To 4
If txtName.Text.ToUpper = ranking(category, rank).ToUpper Then
'Append category name to result
result &= disciplines(category) & "
"
End If
Next
Next
If result = "" Then
txtOutput.Text = "None."
Else
txtOutput.Text = result
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 217 of 443)
22. Private Sub btnDisplay_Click() Handles btnDisplay.Click
'Calculate total increase in the the number of
'units for the five leading restaurant chains.
Dim units(4, 1) As Integer
ReadData(units)
ShowChange(units)
End Sub
Sub ReadData(units(,) As Integer)
'Read units for each restaurant.
Dim table() As String = IO.File.ReadAllLines("Restaurants.txt")
Dim data() As String
For company As Integer = 0 To 4
data = table(company).Split(","c)
For yr As Integer = 0 To 1
units(company, yr) = CInt(data(yr + 1))
Next
Next
End Sub
Sub ShowChange(units(,) As Integer)
'Compute and show change in units
Dim total As Integer = 0
For company As Integer = 0 To 4
total += units(company, 1) - units(company, 0)
Next
txtChange.Text = total.ToString("N0")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 218 of 443)
23. Private Sub btnDisplay_Click() Handles btnDisplay.Click
Dim scores(3, 3) As Integer
Dim golfers(3) As String
Dim table() As String = IO.File.ReadAllLines("Golf.txt")
Dim data() As String
Dim golferTotal(3) As Integer, roundTotal(3) As Integer
For i As Integer = 0 To 3
data = table(i).Split(","c)
golfers(i) = data(0)
For j As Integer = 0 To 3
scores(i, j) = CInt(data(j + 1))
Next
Next
For golfer As Integer = 0 To 3
For round As Integer = 0 To 3
golferTotal(golfer) += scores(golfer, round)
roundTotal(round) += scores(golfer, round)
Next
Next
'Display golfer's totals
lstOutput.Items.Add("GOLFER TOTALS")
For golfer As Integer = 0 To 3
lstOutput.Items.Add(golfers(golfer) & ": " & golferTotal(golfer))
Next
lstOutput.Items.Add("")
'Display average per round
lstOutput.Items.Add("ROUND AVERAGE")
For round As Integer = 0 To 3
lstOutput.Items.Add(round + 1 & ": " & (roundTotal(round) / 4).ToString("N"))
Next
End Sub
24. Dim scores(14, 2) As Integer
Dim count As Integer
Dim names(14) As String
Dim grades() As Integer
'Stores students' exam scores
'Current number of students stored
'Stores students' names
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 219 of 443)
Private Sub btnAdd_Click(...) Handles btnAdd.Click
If (count = 15) Then
MessageBox.Show("Fifteen students already stored.", "Warning")
Else
count += 1
names(count - 1) = txtName.Text
scores(count - 1, 0) = CInt(txtExam1.Text)
scores(count - 1, 1) = CInt(txtExam2.Text)
scores(count - 1, 2) = CInt(txtExam3.Text)
txtName.Clear()
txtExam1.Clear()
txtExam2.Clear()
txtExam3.Clear()
txtName.Focus()
End If
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim sum As Integer
'Display student's semester grades
lstOutput.Items.Clear()
lstOutput.Items.Add("Students' Semester Average")
For i As Integer = 0 To count - 1
'Accumulate sum of scores for each student
sum = 0
For exam As Integer = 0 To 2
sum += scores(i, exam)
Next
'Display the student's name and semester average
lstOutput.Items.Add(names(i) & ": " & (sum / 3).ToString("N"))
Next
'Display median on the exams
lstOutput.Items.Add("Exam Medians")
For exam As Integer = 0 To 2
ReDim grades(count - 1)
For i As Integer = 0 To count - 1
grades(i) = scores(i, exam)
Next
lstOutput.Items.Add(exam + 1 & ": " & Median(grades))
Next
End Sub
Function Median(grades() As Integer) As Double
Dim query = From grade In grades
Order By grade Ascending
Select grade
grades = query.ToArray
'grades have been sorted
Dim n As Integer
If (grades.Count Mod 2 <> 0) Then 'case where grades.Count is odd
n = CInt((grades.Count - 1) / 2)
Return grades(n)
Else
'case where grades.count is even
n = CInt((grades.Count / 2) - 1)
Return (grades(n) + grades(n + 1)) / 2
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 220 of 443)
25. Structure Month
Dim name As String
Dim avePrecip As Double
End Structure
Structure Year
Dim name As Integer
Dim totalPrecip As Double
End Structure
Dim months(11) As Month
Dim monthNames() As String = IO.File.ReadAllLines("MONTHS.TXT")
Dim precipData(4, 12) As Double
Dim years(4) As Year
Private Sub frmRain_Load(...) Handles MyBase.Load
Dim rowOfNums() As String = IO.File.ReadAllLines("RAIN.TXT")
For i As Integer = 0 To precipData.GetUpperBound(0)
Dim line() As String = rowOfNums(i).Split(","c)
For j As Integer = 0 To precipData.GetUpperBound(1)
precipData(i, j) = CDbl(line(j))
Next
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
For j As Integer = 0 To 11
months(j).name = monthNames(j)
Dim sum As Double = 0
For i As Integer = 0 To 4
sum += precipData(i, j)
Next
months(j).avePrecip = sum / 5
Next
Dim query = From mnth In months
Let ave = (mnth.avePrecip).ToString("N")
Select mnth.name, ave
dgvOutputMonths.DataSource = query.ToList
dgvOutputMonths.CurrentCell = Nothing
dgvOutputMonths.Columns("name").HeaderText = "Month"
dgvOutputMonths.Columns("ave").HeaderText = "Average Precipitation"
For i As Integer = 0 To 4
years(i).name = CInt(precipData(i, 12))
Dim sum As Double = 0
For j As Integer = 0 To 11
sum += precipData(i, j)
Next
years(i).totalPrecip = sum
Next
Dim query2 = From yr In years
Let totPrec = (yr.totalPrecip).ToString("N")
Select yr.name, totPrec
dgvOutputYrs.DataSource = query2.ToList
dgvOutputYrs.CurrentCell = Nothing
dgvOutputYrs.Columns("name").HeaderText = "Year"
dgvOutputYrs.Columns("totPrec").HeaderText = "Total Precipitation for the Year"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 221 of 443)
26. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Load data into an array, cumulate totals, and display a report
Dim totalSales As Double
Dim sales(,) As Integer = {{25, 64, 23, 45, 14},{12, 82, 19, 34, 63},
{54, 22, 17, 43, 35}}
Dim price() As Decimal = {12, 17.95D, 95, 86.5D, 78}
Dim totals(2) As Decimal
For store As Integer = 0 To 2
For item As Integer = 0 To 4
totals(store) += sales(store, item) * price(item)
Next
Next
lstOutput.Items.Add("Sales per store")
For store As Integer = 0 To 2
lstOutput.Items.Add(store + 1 & ": " & (totals(store)).ToString("C"))
totalSales += totals(store)
Next
lstOutput.Items.Add("Total sales: " & totalSales.ToString("C"))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 222 of 443)
27. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display the course and campus enrollments
'enrollment array named er
Dim er(,) As Integer = {{5, 15, 22, 21, 12, 25, 16, 11, 17, 23},
{11, 23, 51, 25, 32, 35, 32, 52, 25, 21},
{2, 12, 32, 32, 25, 26, 29, 12, 15, 11}}
'Define the arrays to accumulate the information
Dim campusTotal(2), courseTotal(9) As Integer
For campus As Integer = 0 To 2
For course As Integer = 0 To 9
campusTotal(campus) += er(campus, course)
courseTotal(course) += er(campus, course)
Next
Next
'Display the campus enrollment
lstOutput.Items.Add("CAMPUS ENROLLMENT")
For campus As Integer = 0 To 2
lstOutput.Items.Add((campus + 1) & ": " & campusTotal(campus))
Next
'Display the course enrollment
lstOutput.Items.Add("COURSE ENROLLMENT")
For course As Integer = 0 To 9
lstOutput.Items.Add((course + 1) & ": " & courseTotal(course))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 223 of 443)
28. Private Sub btnCompute_Click(...) Handles btnCompute.Click
'Compute total amount spent on salaries
Dim salary(6, 3) As Decimal
'first 7 categories of federal pay scale
Dim employees(6, 3) As Integer 'number of employees of each classification
ReadData(salary, employees)
ShowTotalPay(salary, employees)
End Sub
Sub ReadData(ByRef salary(,) As Decimal, ByRef employees(,) As Integer)
'Get salaries and number of employees.
Dim filePaySched As String = "GS-PAY.TXT"
Dim fileEmployees As String = "GS-EMPLOYEES.TXT"
Dim table() As String = IO.File.ReadAllLines(filePaySched)
Dim data() As String
For category As Integer = 0 To 6
data = table(category).Split(","c)
For stp As Integer = 0 To 3
salary(category, stp) = CDec(data(stp))
Next
Next
table = IO.File.ReadAllLines(fileEmployees)
For category As Integer = 0 To 6
data = table(category).Split(","c)
For stp As Integer = 0 To 3
employees(category, stp) = CInt(data(stp))
Next
Next
End Sub
Sub ShowTotalPay(salary(,) As Decimal, employees(,) As Integer)
'Compute total pay to all employees.
Dim total As Decimal = 0
For category As Integer = 0 To 6
For stp As Integer = 0 To 3
total += salary(category, stp) * employees(category, stp)
Next
Next
txtTotalOfSalaries.Text = total.ToString("C0")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 224 of 443)
29. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim n As Integer = CInt(InputBox("How many elements are in each row" &
" and column of the array?"))
Dim a(n - 1, n - 1) As Integer
For i As Integer = 0 To n - 1
For j As Integer = 0 To n - 1
a(i, j) = CInt(InputBox("What is the entry in Row " &
i + 1 & ", Column " & j + 1))
Next
Next
If TestMagic(n, a) Then
txtAnswer.Text = "Yes"
Else
txtAnswer.Text = "No"
End If
End Sub
Function TestMagic(n As Integer, a(,) As Integer) As Boolean
Dim sum, total As Integer
'sum of numbers in first row
'Find sum of elements in first row\sum = 0
For j As Integer = 0 To n - 1
sum += a(0, j)
Next
'Test row totals
For i As Integer = 1 To n - 1
total = 0
For j As Integer = 0 To n - 1
total += a(i, j)
Next
If total <> sum Then
Return False
End If
Next
'Test column totals
For j As Integer = 0 To n - 1
total = 0
For i As Integer = 0 To n - 1
total += a(i, j)
Next
If total <> sum Then
Return False
End If
Next
'Test first diagonal
total = 0
For i As Integer = 0 To n - 1
total += a(i, i)
Next
If total <> sum Then
Return False
End If
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 225 of 443)
'Test second diagonal
total = 0
For i As Integer = 0 To n - 1
total += a(i, n - i - 1)
Next
If total <> sum Then
Return False
End If
Return True
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 226 of 443)
CHAPTER 7 PROGRAMMING PROJECTS
1. 'Unit Conversion
Dim unitName(8) As String
Dim inFeet(8) As Double
Dim numUnits As Double = 8
Dim units() As String = IO.File.ReadAllLines("Units.txt")
Private Sub frmConvert_Load(...) Handles MyBase.Load
'Load conversion into array
For i As Integer = 0 To 8
unitName(i) = units(i).Split(","c)(0)
inFeet(i) = CDbl(units(i).Split(","c)(1))
lstUnits.Items.Add((i + 1) & ". " & unitName(i))
Next
End Sub
Private Sub btnConvert_Click(...) Handles btnConvert.Click
'Program to convert units of measure
Dim length As Double, fromUnit As Integer, toUnit As Integer
InputData(fromUnit, toUnit, length)
If (fromUnit >= 1) And (fromUnit <= numUnits) And
(toUnit >= 1) And (toUnit <= numUnits) Then
ConvertUnits(inFeet, fromUnit, toUnit, length)
Else
MessageBox.Show("Only pick a unit from 1 to 9.")
End If
End Sub
Sub InputData(ByRef fromUnit As Integer, ByRef toUnit As Integer,
ByRef length As Double)
'Input source, destination, and length
length = CDbl(mtxtLength.Text)
fromUnit = CInt(mtxtFrom.Text)
toUnit = CInt(mtxtTo.Text)
End Sub
Sub ConvertUnits(inFeet() As Double, fromUnit As Integer,
toUnit As Integer, length As Double)
'Perform conversion and display result
Dim result As Double = inFeet(fromUnit - 1) / inFeet(toUnit - 1) * length
txtOutput.Text = result.ToString("N")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 227 of 443)
2. Private Sub btnCheckValidity_Click() Handles btnCheckValidity.Click
If checkFormat(txtISBN.Text) Then
If isValidISBN(txtISBN.Text) Then
txtResult.Text = "YES"
Else
txtResult.Text = "NO"
End If
Else
'Improperly formatted ISBN string
MessageBox.Show("ISBN is not properly formatted.")
End If
End Sub
Function checkFormat(isbn As String) As Boolean
'Checks the format of the input string
'to make sure that the last character is an X or a digit,
'and the remaining characters are digits or hyphens
Dim digitCount As Integer
Dim hasInvalidCharacter As Boolean
Dim i As Integer = 1
digitCount = 0
Do While i < isbn.Length And hasInvalidCharacter = False
If isDigit(isbn.Substring(i - 1, 1)) Then
digitCount = digitCount + 1
ElseIf isbn.Substring(i - 1, 1) <> "-" Then
hasInvalidCharacter = True
End If
i = i + 1
Loop
'Check last digit individually to allow for an X
If Not (isDigit(isbn.Substring(i - 1, 1)) Or
(isbn.Substring(i - 1, 1) = "X")) Then
hasInvalidCharacter = True
Else
digitCount = digitCount + 1
End If
If hasInvalidCharacter Or (digitCount <> 10) Then
Return False
Else
Return True
End If
End Function
Function isDigit(digit As String) As Boolean
If (digit.Length = 1) And (digit >= "0") And (digit <= "9") Then
Return True
Else
Return False
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 228 of 443)
Function isValidISBN(isbn As String) As Boolean
Dim isbnDigits(9) As Integer
Dim i, j As Integer 'array index/loop variable
Dim strPos As Integer 'position in string
Dim checksum As Integer
'Checks a properly formatted ISBN string to see if the number is valid
'according to checksum formula
i = 1
strPos = 1
Do While i <= 9
If (isbn.Substring(strPos - 1, 1) <> "-") Then
isbnDigits(i - 1) = CInt(isbn.Substring(strPos - 1, 1))
i = i + 1
End If
strPos = strPos + 1
Loop
If isbn.Substring(isbn.Length - 1, 1) = "X" Then
isbnDigits(9) = 10
Else
isbnDigits(9) = CInt(isbn.Substring(isbn.Length - 1, 1))
End If
checksum = 0
For j = 0 To 9
checksum = checksum + (10 - j) * isbnDigits(j)
Next
If checksum Mod 11 = 0 Then
Return True
Else
Return False
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 229 of 443)
3. Dim scores() As Double
Private Sub frmGrades_Load(...) Handles MyBase.Load
'Read exam scores into the scores array
Dim temp() As String = IO.File.ReadAllLines("Scores.txt")
Dim query1 = From str In temp
Select CDbl(str)
scores = query1.ToArray
End Sub
Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
Dim m = scores.Average
Dim query2 = From num In scores
Select (num - m) ^ 2
Dim sd = Math.Sqrt(query2.Sum / scores.Count)
txtNum.Text = CStr(scores.Count)
txtMean.Text = m.ToString("N")
txtStDev.Text = sd.ToString("N")
Dim query3 = From num In scores
Let grade = GetGrade(num, m, sd)
Select num, grade
dgvOutput.DataSource = query3.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("num").HeaderText = "Score"
dgvOutput.Columns("grade").HeaderText = "Grade"
End Sub
Function GetGrade(score As Double, m As Double, sd As Double) As String
Select Case score
Case Is >= m + 1.5 * sd
Return "A"
Case Is >= m + 0.5 * sd
Return "B"
Case Is >= m - 0.5 * sd
Return "C"
Case Is >= m - 1.5 * sd
Return "D"
Case Else
Return "F"
End Select
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 230 of 443)
4. Dim degrees() As String = IO.File.ReadAllLines("Degrees.txt")
Private Sub btnDegrees_Click(...) Handles btnDegrees.Click
'Show table of degrees conferred in 1981 and 2013
Dim query = From line In degrees _
Let field = line.Split(","c)(0)
Let deg1981 = (CInt(line.Split(","c)(1))).ToString("N0")
Let deg2013 = (CInt(line.Split(","c)(2))).ToString("N0")
Order By field Ascending
Select field, deg1981, deg2013
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("field").HeaderText = "Field of Study"
dgvOutput.Columns("deg1981").HeaderText = "1981"
dgvOutput.Columns("deg2013").HeaderText = "2013"
End Sub
Private Sub btnChanges_Click(...) Handles btnChanges.Click
'Show table of percentage changes in degrees from 1981 to 2013
Dim query = From line In degrees
Let field = line.Split(","c)(0)
Let deg1981 = CInt(line.Split(","c)(1))
Let deg2013 = CInt(line.Split(","c)(2))
Let perGrowth = (deg2013 - deg1981) / deg1981
Order By perGrowth Descending
Let formattedPerGrowth = perGrowth.ToString("P1")
Select field, formattedPerGrowth
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("field").HeaderText = "Field of Study"
dgvOutput.Columns("formattedPerGrowth").HeaderText = "Change (1981-2013)"
End Sub
Private Sub btnHistogram_Click(...) Handles btnHistogram.Click
'Histogram of degrees in 2013
Dim query = From line In degrees
Let field = line.Split(","c)(0)
Let deg1981 = CInt(line.Split(","c)(1))
Let deg2013 = CInt(line.Split(","c)(2))
Order By deg2013 Ascending _
Let bar = Stars(deg2013 / 10000)
Let formattedDeg2013 = deg2013.ToString("N0")
Select field, bar, formattedDeg2013
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("field").HeaderText = "Field of Study"
dgvOutput.Columns("bar").HeaderText = ""
dgvOutput.Columns("formattedDeg2013").HeaderText = "Degrees in 2013"
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
Me.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 231 of 443)
Function Stars(numStars As Double) As String
'Display a row of stars
Dim row As String = ""
For i As Integer = 1 To CInt(numStars)
row &= Chr(149)
Next
Return row
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 232 of 443)
5. 'Textese translator
Dim dictionary() As String = IO.File.ReadAllLines("Textese.txt")
Private Sub btnTranslate_Click(...) Handles btnTranslate.Click
'Translate English sentence to French and German.
Dim sentenceArray() As String = txtSentence.Text.Split(" "c)
txtTextese.Text = ""
For Each word In sentenceArray
txtTextese.Text &= findTranslation(word) + " "
Next
End Sub
Function findTranslation(word As String) As String
Dim position As Integer, foundflag As Boolean
For Each pair As String In dictionary
If pair.StartsWith(word.ToLower & ",") Then
position = pair.IndexOf(",")
foundflag = True
Return pair.Substring(position + 1)
End If
Next
If Not foundflag Then
Return word
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 233 of 443)
6. Structure Team
Dim name As String
Dim wins As Integer
End Structure
Dim teams(5) As Team
'Holds the league data
Dim winners(5, 5) As Boolean 'True if the first team won
Private Sub frmSoccer_Load(...) Handles MyBase.Load
teams(0).name = "Jazz"
teams(1).name = "Jets"
teams(2).name = "Owls"
teams(3).name = "Rams"
teams(4).name = "Cubs"
teams(5).name = "Zips"
winners(0, 1) = True
'True means team (#0) won
winners(0, 2) = True
winners(0, 3) = False
'False means second team (#3) won
winners(0, 4) = False
winners(0, 5) = True
winners(1, 2) = True
winners(1, 3) = True
winners(1, 4) = False
winners(1, 5) = False
winners(2, 3) = False
winners(2, 4) = True
winners(2, 5) = True
winners(3, 4) = True
winners(3, 5) = True
winners(4, 5) = True
For i As Integer = 0 To 4
For j As Integer = (i + 1) To 5
If winners(i, j) Then
teams(i).wins += 1
'First team won
Else
teams(j).wins += 1
'Second team won
End If
Next
Next
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From team In teams
Let name = team.name
Let wins = team.wins
Order By team.wins Descending
Select name, wins
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Team"
dgvOutput.Columns("wins").HeaderText = "Wins"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 234 of 443)
7. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim hand(3, 12), suits(3), denoms(12) As Integer
InputCard(hand, suits, denoms, txtDenomination1.Text, mtxtSuit1.Text)
InputCard(hand, suits, denoms, txtDenomination2.Text, mtxtSuit2.Text)
InputCard(hand, suits, denoms, txtDenomination3.Text, mtxtSuit3.Text)
InputCard(hand, suits, denoms, txtDenomination4.Text, mtxtSuit4.Text)
InputCard(hand, suits, denoms, txtDenomination5.Text, mtxtSuit5.Text)
'Determine and display score
txtOutput.Text = "The hand is " & GetScore(hand, suits, denoms) & "."
End Sub
Sub InputCard(ByRef hand(,) As Integer, ByRef suits() As Integer,
ByRef denoms() As Integer, denomStr As String,suitStr As String)
'Store the card into the array
Dim denom As Integer = CInt(denomStr) - 1
Dim suit As Integer
Select Case suitStr.ToUpper
'Determine suit
Case "C"
'Clubs
suit = 0
Case "D"
'Diamonds
suit = 1
Case "H"
suit = 2
'Hearts
Case Else
suit = 3
'All other input means Spades
End Select
hand(suit, denom) = 1
'Set indicies for card to 1
suits(suit) += 1
'Increment counter for suit
denoms(denom) += 1
'Increment counter for denomination
End Sub
Function GetScore(hand(,) As Integer, suits() As Integer,
denoms() As Integer) As String
'Determine score of the hand, starting with highest type
If IsFlush(suits) And IsStraight(hand) Then
If IsAnySuit(hand, 0) And IsAnySuit(hand, 12) Then
Return "a royal straight flush"
Else
Return "a straight flush"
End If
End If
If IsFlush(suits) Then
Return "a flush"
End If
If IsFullHouse(denoms) Then
Return "a full house"
End If
If IsFourOfAKind(denoms) Then
Return "four of a kind"
End If
If IsStraight(hand) Then
Return "a straight"
End If
If IsThreeOfAKind(denoms) Then
Return "three of a kind"
End If
If IsTwoPair(denoms) Then
Return "two pairs"
End If
If IsOnePair(denoms) Then
Return "one pair"
End If
Return "nothing"
'No result
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 235 of 443)
Function IsFlush(suits() As Integer) As Boolean
'Test for a flush in each suit
For suit As Integer = 0 To 3
If suits(suit) = 5 Then
Return True
End If
Next
Return False
End Function
Function IsStraight(hand(,) As Integer) As Boolean
'Test for a straight
Dim denom As Integer = 13
Do
'Find highest denomination
denom = denom - 1
Loop Until IsAnySuit(hand, denom)
'If highest denomination is less than a 4 then there is no straight
If denom < 4 Then
Return False
End If
For length As Integer = 1 To 3 'Test three earlier denominations
If Not IsAnySuit(hand, denom - length) Then
Return False
End If
Next
If denom = 12 Then 'If highest is a king, check for nine or ace
If IsAnySuit(hand, 8) Or IsAnySuit(hand, 0) Then
Return True
Else
Return False
End If
Else
'If highest is not a king, test for the fifth card
Return IsAnySuit(hand, denom - 4)
End If
End Function
Function IsAnySuit(hand(,) As Integer, denom As Integer) As Boolean
'Test for a 1 for any suit of the given denomination
For suit As Integer = 0 To 3
If hand(suit, denom) = 1 Then
Return True
End If
Next
Return False
End Function
Function IsFullHouse(denoms() As Integer) As Boolean
'Test for a full house in any suit
For denom As Integer = 0 To 12 'If any denomination is 1, 4 or 5, then no
If (denoms(denom) = 1) Or (denoms(denom) > 3) Then
Return False
End If
Next
Return True 'That is, all denominations are either 0, 2 or 3.
End Function
Function IsFourOfAKind(denoms() As Integer) As Boolean
'True if any suit has a four-of-a-kind
For denom As Integer = 0 To 12
If denoms(denom) = 4 Then
'If four cards with this denomination
Return True
End If
Next
Return False
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 236 of 443)
Function IsThreeOfAKind(denoms() As Integer) As Boolean
'Test for three of a kind in any suit
For denom As Integer = 0 To 12
If denoms(denom) = 3 Then
'If three cards with this denomination
Return True
End If
Next
Return False
End Function
Function IsTwoPair(denoms() As Integer) As Boolean
'Test for two pairs
Dim count As Integer = 0
For denom As Integer = 0 To 12
If denoms(denom) = 2 Then
'If two cards with this denomination
count += 1
End If
Next
If count = 2 Then
Return True
Else
Return False
End If
End Function
Function IsOnePair(denoms() As Integer) As Boolean
'Test for one pair in any suit
For denom As Integer = 0 To 12 'If any denomination is 2, then yes
If denoms(denom) = 2 Then
Return True
End If
Next
Return False
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 237 of 443)
8. Dim seats(9, 3) As String
Dim waiting(99) As String
Dim wait As Integer = 0
'Holds passenger's name in each seat
'Max 100 persons on waiting list
'Number of persons on waiting list
Private Sub frmAirplane_Load(...) Handles MyBase.Load
'Displays the seating chart
DisplaySeats()
End Sub
Sub DisplaySeats()
'Display the seating chart
Dim rowStr As String
lstOutput.Items.Clear()
For row As Integer = 0 To 9
rowStr = ""
For seat As Integer = 0 To 3
If seats(row, seat) <> "" Then
rowStr &= " X"
Else
rowStr &= " ."
End If
If seat = 1 Then
'Display spaces for aisle
rowStr &= "
"
End If
Next
lstOutput.Items.Add(rowStr)
Next
End Sub
Sub DisplayWaiting()
'Display the waiting list
lstWaiting.Items.Clear()
For i As Integer = 0 To wait - 1
lstWaiting.Items.Add(waiting(i))
Next
End Sub
Private Sub btnAdd_Click(...) Handles btnAdd.Click
'Add a passenger to the flight, either chart or waiting list
Dim seat As Integer
'Count number of empty seats
Dim count As Integer = 0
For rw As Integer = 0 To 9
For st As Integer = 0 To 3
If seats(rw, st) = "" Then
count += 1
End If
Next
Next
If count = 0 Then 'If no empty seats then add name to waiting list.
wait += 1
waiting(wait - 1) = txtName.Text
DisplayWaiting()
Else
'Otherwise get the seat and add name to array
Select Case txtSeat.Text.Substring(txtSeat.Text.Length - 1).ToUpper
Case "A"
seat = 0
Case "B"
seat = 1
Case "C"
seat = 2
Case Else
seat = 3
End Select
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 238 of 443)
Dim row As Integer = CInt(txtSeat.Text.Substring(0,txtSeat.Text.Length - 1)) - 1
If seats(row, seat) <> "" Then
'If seat is taken
MessageBox.Show("The seat is taken.", "Taken")
Else
seats(row, seat) = txtName.Text
'Add the name to the array
txtName.Clear()
'Reset input
txtSeat.Clear()
txtName.Focus()
DisplaySeats()
'Display seating chart
End If
End If
End Sub
Private Sub btnDelete_Click(...) Handles btnDelete.Click
For rw As Integer = 0 To 9
For st As Integer = 0 To 3
If seats(rw, st) = txtName.Text Then
If wait > 0 Then
seats(rw, st) = waiting(0) 'Add first person from list
wait = wait - 1 'Decrement counter and shift waiting list
For i As Integer = 0 To wait - 1
waiting(i) = waiting(i + 1)
Next
DisplayWaiting()
'Display the new waiting list
Else
seats(rw, st) = "" 'Clear the seat
DisplaySeats()
'Display the seating chart
End If
txtName.Clear()
End If
Next
Next
If txtName.Text <> "" Then 'If name not found then display message
MessageBox.Show("Name not found in reservation.")
End If
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
End
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 239 of 443)
9. Dim current(1, 1) As Boolean
Dim generation As Integer = 1
Private Sub frmLife_Load(...) Handles MyBase.Load
NewGame()
End Sub
Private Sub btnNew_Click(...) Handles btnNew.Click
'When the New button is pressed, start a new game
NewGame()
End Sub
Sub NewGame()
Dim input As String
'Get the size of the new game
Dim size As Integer = CInt(InputBox("Enter the size of the grid", "Size of grid"))
'Redimension the current generation to the size
ReDim current(size, size)
'Set the default row to all dashes
'Get the initial generation
For row As Integer = 1 To size
input = InputBox("Enter the row #" & row & " of " & size &
" with 1s and dashes:", "Enter row #" & row)
'Parse the input into the array
For column As Integer = 1 To size
current(row, column) = (input.Substring(column - 1, 1) = "1")
Next
Next
generation = 1
Display()
End Sub
Sub Display()
'Display the current generation in the list box
Dim output As String
Dim size As Integer = current.GetUpperBound(0)
'Build each row of output
lstGeneration.Items.Clear()
Dim count As Integer = 0
For row As Integer = 1 To size
'Bulid the output string from each column
output = ""
For column As Integer = 1 To size
If current(row, column) Then
output = output & "1"
count += 1
Else
output = output & "-"
End If
Next
'Display the output string
lstGeneration.Items.Add(output)
Next
'Display the number of individuals
txtIndividuals.Text = CStr(count)
'Update the generation button for the next one
btnGeneration.Text = "Generation #" & generation
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 240 of 443)
Private Sub btnGeneration_Click(...) Handles btnGeneration.Click
Dim size As Integer = current.GetUpperBound(0)
'Create a new array for the future generation
Dim future(size, size) As Boolean
'Populate the future using the current
For row As Integer = 1 To size
For column As Integer = 1 To size
future(row, column) = Survives(row, column)
Next
Next
'Update the current generation with the future
current = future
generation += 1
'Display the current generation
Display()
End Sub
Function Survives(row As Integer, column As Integer) As Boolean
'Determine whether the individual at row, column survives
Dim size As Integer = current.GetUpperBound(0)
Dim count As Integer = 0
'Loop over all neighbors of the individual from the row above to the row below
For r As Integer = row - 1 To row + 1
'Loop from the column before to the column after
For c As Integer = (column – 1) To (column + 1)
'If the neighbor exists and is not the individual
If ((r <> row) Or (c <> column)) And
(r >= 1) And (r <= size) And
(c >= 1) And (c <= size) Then
'If the neighbor is alive then count it
If current(r, c) Then
count += 1
End If
End If
Next
Next
If current(row, column) Then
'Return the result
'If individual exists then neighbors must be 2 or 3 to survive
Return (count = 2) Or (count = 3)
Else
Return (count = 3)
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 241 of 443)
10. 'User-operated directory assistance
Dim workers() As String = IO.File.ReadAllLines("Employees.txt")
Private Sub btnInstructions_Click(...) Handles btnInstructions.Click
MessageBox.Show("Enter the first three letters of the person's last " &
"name followed by the first letter of " &
"the person's first name. ", "Instructions")
End Sub
Private Sub btnAnother_Click(...) Handles btnAnother.Click
lstDisplay.Items.Clear()
txtCode.Text = ""
End Sub
Private Function GetCode(last As String, first As String) As String
Dim word, code As String
word = (last.Substring(0, 3) & first.Substring(0, 1)).ToUpper
code = ""
For i As Integer = 0 To 3
code &= Translate(word.Substring(i, 1))
Next i
Return code
End Function
Private Function Translate(letter As String) As Integer
Select Case letter
Case "A", "B", "C"
Return 2
Case "D", "E", "F"
Return 3
Case "G", "H", "I"
Return 4
Case "J", "K", "L"
Return 5
Case "M", "N", "O"
Return 6
Case "P", "Q", "R", "S"
Return 7
Case "T", "U", "V"
Return 8
Case "W", "X", "Y", "Z"
Return 9
End Select
End Function
Private Sub Button2_Click(...) Handles Button2.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "2"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 242 of 443)
Private Sub Button3_Click(...) Handles Button3.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "3"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
Private Sub Button4_Click(...) Handles Button4.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "4"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
Private Sub Button5_Click(...) Handles Button5.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "5"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
Private Sub Button6_Click(...) Handles Button6.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "6"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
Private Sub Button7_Click(...) Handles Button7.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "7"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
Private Sub Button8_Click(...) Handles Button8.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "8"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 243 of 443)
Private Sub Button9_Click(...) Handles Button9.Click
If txtCode.Text.Length < 4 Then
txtCode.Text &= "9"
If txtCode.Text.Length = 4 Then
DisplayNames()
End If
End If
End Sub
Private Sub DisplayNames()
Dim query = From line In workers
Let lastName = line.Split(","c)(0)
Let firstName = line.Split(","c)(1)
Let ext = line.Split(","c)(2)
Let code = GetCode(lastName, firstName)
Where code = txtCode.Text
Select firstName, lastName, ext
If query.Count = 0 Then
lstDisplay.Items.Add("Could not find a matching name.")
lstDisplay.Items.Add("Please try again.")
Else
For Each worker In query
lstDisplay.Items.Add(worker.firstName & " " & worker.lastName &
" x" & worker.ext)
Next
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 244 of 443)
11. Structure Auto
Dim model As String
Dim count As Integer
Dim gallons As Double
End Structure
'Name of the model
'Number of cars tested
'Total number of gallons used
Dim cars(4) As Auto
'Holds data
Dim vehicles() As String = IO.File.ReadAllLines("Mileage.txt")
Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim query1 = From line In vehicles
Let make = line.Split(","c)(0)
Select make
Dim temp() = query1.ToArray
For i As Integer = 0 To 4
cars(i).model = temp(i)
cars(i).count = NumCars(temp(i))
cars(i).gallons = NumGals(temp(i))
Next
Dim query2 = From car In cars
Let mpg = 100 * car.count / car.gallons
Order By mpg Descending
Let formattedMPG = mpg.ToString("N")
Select car.model, formattedMPG
dgvOutput.DataSource = query2.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("model").HeaderText = "Model"
dgvOutput.Columns("formattedMPG").HeaderText = "MPG"
End Sub
Function NumCars(make As String) As Integer
Dim query = From line In vehicles
Let brand = line.Split(","c)(0)
Where brand = make
Select brand
Return query.Count
End Function
Function NumGals(make As String) As Double
Dim query = From line In vehicles
Let brand = line.Split(","c)(0)
Let gallons = CDbl(line.Split(","c)(1))
Where brand = make
Select gallons
Return query.Sum
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 245 of 443)
12. Private Sub btnVerbalize_Click(...) Handles btnVerbalize.Click
'Verbalize a number.
Dim descriptors() As String = {"", " thousand", " million", " billion",
" trillion", " quadrillion", " quintillion", " sextillion", " septillion"}
Dim number As String = txtNumber.Text
Dim numOfCommas As Integer
Dim loc As Integer
'location of comma in current number
Dim front As String
'number preceding first comma in current number
lstNumber.Items.Clear()
numOfCommas = NumberOfCommas(number)
If numOfCommas = 0 Then
lstNumber.Items.Add(number)
Else
ReDim Preserve descriptors(numOfCommas)
For i As Integer = numOfCommas To 1 Step -1
loc = number.IndexOf(",")
If loc <> -1 Then
front = number.Substring(0, loc)
If Len(front) = 3 Then
front = StripOutLeadingZeros(front)
End If
lstNumber.Items.Add(front & descriptors(i))
number = number.Substring(loc + 1)
End If
Next
If NumberOfCommas(number) = 0 Then
lstNumber.Items.Add(number)
Else
front = number.Substring(0, loc)
front = StripOutLeadingZeros(front)
End If
End If
End Sub
Function NumberOfCommas(number As String) As Integer
Dim locationOfComma As Integer
Dim count As Integer = -1
Do
count += 1
locationOfComma = number.IndexOf(",", locationOfComma + 1)
Loop Until locationOfComma = -1
Return count
End Function
Function StripOutLeadingZeros(front As String) As String
If front = "000" Then
front = " 0"
ElseIf front.Substring(0, 2)="00" Then
front = " " & front.Substring(2)
ElseIf front.Substring(0, 1) = "0" Then
front = " " & front.Substring(1)
End If
Return front
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 246 of 443)
CHAPTER 8
EXERCISES 8.1
1. Samuel Alito,NJ
Henry Baldwin,PA
2. SAMUEL ALITO was appointed in 2006.
HENRY BALDWIN was appointed in 1830.
3. Alito was appointed by Bush
Baldwin was appointed by Jackson
4. (In 2016 output will be as follows.)
Alito appointed 10 years ago
Baldwin appointed 186 years ago
5. Alito,Samuel,2006
Baldwin,Henry,1830
6. Bush,Alito,NJ
Jackson,Baldwin,PA
7. The new file contains the full names of the justices whose last name begins with the letter B
and the years they were appointed to the court. The justices are ordered by the year they were
appointed.
8. The new file contains the states and the full names of the justices appointed during the 1990s.
The justices are ordered by their states.
9. The new file is the same as the original file except that the last three fields have been deleted
from each record.
10. The new file contains the full names of the current justices and the years they were
appointed. The records are ordered by the year appointed. (Note: The file represents the
makeup of the court in January 2016.)
11. The new file contains the names of the people who subscribe to either the New York Times
or the Wall Street Journal, or both.
12. The new file contains the names of the people who subscribe to both the New York Times
and the Wall Street Journal.
13. The new file contains the names of the people who subscribe to the New York Times but not
the Wall Street Journal.
14. The new file contains the names of the people who subscribe to either the New York Times
or the Wall Street Journal, but not both.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 247 of 443)
15. Private Sub btnBoth_Click(...) Handles btnBoth.Click
'Create a file of presidents who were also vice presidents
Dim vicePres() As String = IO.File.ReadAllLines("VPres.txt")
Dim presidents() As String = IO.File.ReadAllLines("USPres.txt")
Dim both() As String = presidents.Intersect(vicePres).ToArray
IO.File.WriteAllLines("Both.txt", both)
MessageBox.Show(both.Count & " presidents", "File Created")
End Sub
16. Private Sub btnOr_Click(...) Handles btnOr.Click
'Create a combined list of presidents and vice presidents
Dim vicePres() As String = IO.File.ReadAllLines("VPres.txt")
Dim presidents() As String = IO.File.ReadAllLines("USPres.txt")
Dim eitherOr() As String = presidents.Union(vicePres).ToArray
IO.File.WriteAllLines("Or.txt", eitherOr)
MessageBox.Show(eitherOr.Count & " people", "File Created")
End Sub
17. Private Sub btnXor_Click(...) Handles btnXor.Click
'Create a file of people who were pres or VP but not both
Dim vicePres() As String = IO.File.ReadAllLines("VPres.txt")
Dim presidents() As String = IO.File.ReadAllLines("USPres.txt")
Dim eitherOr() As String = presidents.Union(vicePres).ToArray
Dim both() As String = presidents.Intersect(vicePres).ToArray
Dim exclusiveOr() As String = eitherOr.Except(both).ToArray
IO.File.WriteAllLines("Xor.txt", exclusiveOr)
MessageBox.Show(exclusiveOr.Count &
" presidents or vice presidents, but not both", "File Created")
End Sub
18. Private Sub btnNotVP_Click(...) Handles btnNotVP.Click
'Create a file of presidents who were not vice-presidents
Dim vicePres() As String = IO.File.ReadAllLines("VPres.txt")
Dim presidents() As String = IO.File.ReadAllLines("USPres.txt")
Dim presOnly() As String = presidents.Except(vicePres).ToArray
IO.File.WriteAllLines("NotVP.txt", presOnly)
MessageBox.Show(presOnly.Count &
" presidents were not vice presidents", "File Created")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 248 of 443)
19. Dim countries() As String = IO.File.ReadAllLines("UN.txt")
'lstContinents was filled at design time
Private Sub lstContinents_SelectedIndexChanged(...) Handles _
lstContinents.SelectedIndexChanged
Dim selectedContinent As String = lstContinents.Text
If (selectedContinent = "Antarctica") Then
lstCountries.DataSource = Nothing
MessageBox.Show("There are no countries in Antarctica.")
Else
Dim query = From nation In countries
Let data = nation.Split(","c)
Let name = data(0)
Let continent = data(1)
Where continent = selectedContinent
Select name
lstCountries.DataSource = query.ToList
lstCountries.SelectedItem = Nothing
End If
End Sub
20. Dim colleges() As String = IO.File.ReadAllLines("Colleges.txt")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display the colleges in Colleges.txt located in the given state
Dim chosenState As String = mtbState.Text.ToUpper
Dim query = From col In colleges
Let data = col.Split(","c)
Let name = data(0)
Let state = data(1)
Let yearFounded = data(2)
Where state = chosenState
Order By name Ascending
Select name, yearFounded
lstColleges.Items.Clear()
For Each institution In query
lstColleges.Items.Add(institution.name & " " &
institution.yearFounded)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 249 of 443)
21. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim cities() As String = IO.File.ReadAllLines("Cities.txt")
Dim query = From city In cities
Let data = city.Split(","c)
Let pop2010 = CDbl(data(3))
Order By pop2010 Descending
Select pop2010
Dim pops() As Double = query.ToArray
ReDim Preserve pops(9)
txtOutput.Text = (100000 * pops.Sum).ToString("N0")
End Sub
22. Dim states() As String = IO.File.ReadAllLines("USStates.txt")
Private Sub btnFind_Click(...) Handles btnFind.Click
Dim query = From line In states
Let data = line.Split(","c)
Let name = data(0)
Let abbrev = data(1)
Let area = data(2)
Where abbrev = mtbAbbrev.Text.ToUpper
Select name, area
txtOutput.Text = "The area of " & query.First.name & " is " &
(CDbl(query.First.area)).ToString("N0") & " square miles."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 250 of 443)
23. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim states() As String = IO.File.ReadAllLines("USStates.txt")
Dim query = From line In states
Let name = line.Split(","c)(0).ToUpper
Let abbrev = line.Split(","c)(1)
Where Not name.StartsWith(abbrev)
Order By name Ascending
Select abbrev, name
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("abbrev").HeaderText = "State Abbreviation"
dgvOutput.Columns("name").HeaderText = "State"
End Sub
24. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim usStates() As String = IO.File.ReadAllLines("USStates.txt")
Dim query = From line In usStates
Let name = line.Split(","c)(0)
Let abbrev = line.Split(","c)(1)
Let area = CInt(line.Split(","c)(2))
Let pop = CInt(line.Split(","c)(3))
Let density = pop / area
Let formattedDensity = density.ToString("N")
Order By density Descending
Select name, formattedDensity
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "State"
dgvOutput.Columns("formattedDensity").HeaderText =
"People per Square Mile"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 251 of 443)
25. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim states() As String = IO.File.ReadAllLines("USStates.txt")
Dim query1 = From line In states
Let area = CInt(line.Split(","c)(2))
Select area
Dim totalArea = query1.Sum
Dim query2 = From line In states
Let name = line.Split(","c)(0)
Let area = CInt(line.Split(","c)(2))
Let percentArea = (area / totalArea).ToString("P")
Order By area Descending
Select name, percentArea
dgvOutput.DataSource = query2.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "State"
dgvOutput.Columns("percentArea").HeaderText =
"Percentage of Total Area"
End Sub
26. Dim baseball() As String = IO.File.ReadAllLines("Baseball.txt")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From line In baseball
Let fullName = line.Split(","c)(0)
Let team = line.Split(","c)(1)
Let atBats = CInt(line.Split(","c)(2))
Let hits = CInt(line.Split(","c)(3))
Let firstName = fullName.Split(" "c).First
Let lastName = fullName.Split(" "c).Last
Let ave = (hits / atBats).ToString("N3")
Where team.ToUpper = txtTeam.Text.ToUpper
Order By lastName, firstName
Select fullName, ave
dgvPlayers.DataSource = query.ToList
dgvPlayers.CurrentCell = Nothing
dgvPlayers.Columns("fullName").HeaderText = "Player"
dgvPlayers.Columns("ave").HeaderText = "Batting Average"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 252 of 443)
27. Private Sub btnUpdate_Click(...) Handles btnUpdate.Click
Dim colors() As String = IO.File.ReadAllLines("Pre1990Colors.txt")
Dim retired() As String = IO.File.ReadAllLines("RetiredColors.txt")
Dim added() As String = IO.File.ReadAllLines("AddedColors.txt")
Dim tempArray() As String = colors.Except(retired).ToArray
Dim query = From color In tempArray.Concat(added)
Order By color
Select color
IO.File.WriteAllLines("NewColors.txt", query)
End Sub
28. Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Dim query = From justice In justices
Let data = justice.Split(","c)
Let fullName = data(0) & " " & data(1)
Let state = data(3)
Select fullName & "," & state
IO.File.WriteAllLines("Justices_States.txt", query)
End Sub
29. Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Dim query = From justice In justices
Let data = justice.Split(","c)
Let firstName = data(0)
Let secondName = data(1)
Let pres = data(2)
Let yrAppt = data(4)
Let yrLeft = data(5)
Select firstName & "," & secondName & "," & pres & "," &
yrAppt & "," & yrLeft
IO.File.WriteAllLines("JusticesNoState.txt", query)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 253 of 443)
30. Private Sub btnCreate_Click(...) Handles btnDisplay.Click
Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Dim query = From justice In justices
Let data = justice.Split(","c)
Let firstName = data(0)
Let secondName = data(1)
Let pres = data(2)
Let state = data(3)
Let yrAppt = data(4)
Let yrLeft = data(5)
Select firstName, secondName, pres, state, yrAppt, yrLeft
dgvJustices.DataSource = query.ToList
dgvJustices.CurrentCell = Nothing
End Sub
31. Private Sub btnCreate_Click(...) Handles btnDisplay.Click
'query1: all states; query2: states with justices
Dim states() As String = IO.File.ReadAllLines("USStates.txt")
Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Dim query1 = From state In states
Let abbrev = state.Split(","c)(1)
Select abbrev
Dim query2 = From justice In justices
Let state = justice.Split(","c)(3)
Select state
IO.File.WriteAllLines("NoJustices.txt", query1.Except(query2))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 254 of 443)
32. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'query1: all years; query2: years in which justices were appointed
Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Dim years(226) As Integer
For i As Integer = 0 To 226
years(i) = i + 1789
Next
Dim query1 = From yr In years
Select CStr(yr)
Dim query2 = From justice In justices
Let yearAppointed = justice.Split(","c)(4)
Select yearAppointed
IO.File.WriteAllLines("NoAppointments.txt", query1.Except(query2))
End Sub
33. Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Private Sub Create_Click(...) Handles Create.Click
Dim query = From line In justices
Let state = line.Split(","c)(3)
Order By state Ascending
Select state & "," & NumberOfJustices(state)
Distinct
IO.File.WriteAllLines("NewFile.txt", query)
End Sub
Function NumberOfJustices(state As String) As Integer
Dim query = From line In justices
Let place = line.Split(","c)(3)
Where place = state
Select place
Return query.Count
End Function
34. Dim justices() As String = IO.File.ReadAllLines("Justices.txt")
Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim query = From line In justices
Let pres = line.Split(","c)(2)
Order By pres Ascending
Select pres & "," & NumberOfJustices(pres)
Distinct
IO.File.WriteAllLines("NewFile.txt", query)
End Sub
Function NumberOfJustices(pres As String) As Integer
Dim query = From line In justices
Let chief = line.Split(","c)(2)
Where chief = pres
Select chief
Return query.Count
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 255 of 443)
35. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From state In IO.File.ReadAllLines("USStates.txt")
Let data = state.Split(","c)
Let name = data(0)
Let abbrev = data(1)
Let area = (CDbl(data(2))).ToString("N0")
Let pop = (CDbl(data(2))).ToString("N0")
Order By name
Select name, abbrev, area, pop
dgvStates.DataSource = query.ToList
dgvStates.CurrentCell = Nothing
End Sub
36. Dim dates() As String = IO.File.ReadAllLines("Calendar2017.txt")
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim query = From line In dates
Let shortDate = line.split(","c)(0)
Let weekDay = line.split(","c)(1)
Where shortDate = txtDate.Text
Select weekDay
If query.Count = 1 Then
txtDay.Text = query.First
Else
Dim str As String = " is not a valid date in 2017"
MessageBox.Show(txtDate.Text & str)
txtDate.Clear()
txtDate.Focus()
End If
End Sub
EXERCISES 8.2
1. Hello
2. Aloha
3. Bon Jour
4. Buenos Dias
5. You must enter a ©number.
6. Error occurred.
7. Error occurred.
2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 256 of 443)
8. Error occurred
9. File Ages.txt contains an invalid age.
10. File Ages.txt not found
11. The file Welcome.txt is created and has the following lines:
Hello
Bon Jour
12. The Mystery function returns the value True if Laura is in the file, and returns False
otherwise.
13. The filespec Greetings.txt should be delimited with quotation marks.
14. A StreamWriter cannot read from a file.
15. There should be no quotations around the variable name as the argument to the CreateText
method.
16. The string literal "Greetings.txt" should be replaced with the variable sw to close the reader
in the third line. Also, replace StreamReader with StreamWriter.
17. The variable age is declared within the Try-Catch-Finally block. Therefore it has block-level
scope and is not available below the line End Try.
18. In line 4, CreateFile should be replaced with CreateText. In line 5, the words "exp As"
should be inserted after the word "Catch". Also, the sw.Close() statement will generate an
exception if the file was not found.
19. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Create a text file and populate it
Dim sw As IO.StreamWriter = IO.File.CreateText("Cowboy.txt")
sw.WriteLine("Colt Peacemaker,12.20")
sw.WriteLine("Holster,2.00")
sw.WriteLine("Levi Strauss jeans,1.35")
sw.WriteLine("Saddle,40.00")
sw.WriteLine("Stetson,10.00")
sw.Close() 'Always close the writer when finished.
MessageBox.Show("The file has been created.", "Done")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 257 of 443)
20. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Markdown the price of a saddle by 20% and
'store new list into Cowboy2.txt
'Open Cowboy for reading and Cowboy2 for creating
Dim sr As IO.StreamReader = IO.File.OpenText("Cowboy.txt")
Dim sw As IO.StreamWriter = IO.File.CreateText("Cowboy2.txt")
Dim line As String = ""
Dim data() As String
Dim item As String
Dim price As Decimal
Do While Not sr.EndOfStream
'Loop until the end of file.
line = sr.ReadLine
'Read the current item and price.
data = line.Split(","c)
item = data(0)
price = CDec(data(1))
If (item.ToUpper = "SADDLE") Then
'Adjust the price of the Saddle item.
price *= 0.8D
price = Math.Round(price, 2)
End If
'Write the item and price
sw.WriteLine(item & "," & price.ToString("N"))
Loop
sr.Close() 'Always close the reader and writer when finished.
sw.Close()
MessageBox.Show("New file created.", "Done")
End Sub
21. Private Sub btnAdd_Click(...) Handles btnAdd.Click
'Append item to a text file
Dim sw As IO.StreamWriter = IO.File.AppendText("Cowboy.txt")
sw.WriteLine("Winchester Rifle,20.50")
sw.Close()
MessageBox.Show("The item has been added to the file.", "Done")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 258 of 443)
22. Private Sub frmSalesReceipt_Load(...) Handles MyBase.Load
'Create a file containing the order
Dim sw As IO.StreamWriter = IO.File.CreateText("Order.txt")
sw.WriteLine(3)
sw.WriteLine(2)
sw.WriteLine(10)
sw.WriteLine(1)
sw.WriteLine(4)
sw.Close()
'Always close writer when finished
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Read the order and items and display a receipt
'Open order and item files
Dim srOrder As IO.StreamReader = IO.File.OpenText("Order.txt")
Dim srItem As IO.StreamReader = IO.File.OpenText("Cowboy.txt")
Dim price, total As Decimal
total = 0
Dim quantity As Integer
Dim line As String
Dim data() As String
lstOutput.Items.Clear()
Do While Not srItem.EndOfStream
'Loop over all records in Order
quantity = CInt(srOrder.ReadLine)
line = srItem.ReadLine
data = line.Split(","c)
price = CDec(data(1))
lstOutput.Items.Add(quantity & " " & data(0) & ": " &
(quantity * price).ToString("C"))
total += quantity * price
Loop
srOrder.Close()
'Always close readers when finished
srItem.Close()
lstOutput.Items.Add("TOTAL: " & total.ToString("C"))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 259 of 443)
23. Private Sub btnAdd_Click(...) Handles btnAdd.Click
Dim item As String
Dim price As Decimal
Dim sr As IO.StreamReader = IO.File.OpenText("Cowboy.txt")
Dim sw As IO.StreamWriter = IO.File.CreateText("Cowboy2.txt")
Dim flag As Boolean = False
Dim line As String = ""
Dim data() As String
Do While (line < txtItem.Text) And (Not sr.EndOfStream)
line = sr.ReadLine
data = line.Split(","c)
item = data(0)
price = CDec(data(1))
If item > txtItem.Text Then
sw.WriteLine(txtItem.Text & "," & txtPrice.Text)
'Set flag to True so we don't add it again at the end.
flag = True
End If
sw.WriteLine(line)
Loop
Do Until sr.EndOfStream
line = sr.ReadLine
sw.WriteLine(line)
Loop
If Not flag Then
sw.WriteLine(txtItem.Text & "," & txtPrice.Text)
End If
sr.Close()
sw.Close()
MessageBox.Show("Item added to Cowboy2.txt")
txtItem.Clear()
txtPrice.Clear()
End Sub
24. Dim sw As IO.StreamWriter = IO.File.AppendText("Cowboy.txt")
Private Sub btnAdd_Click(...) Handles btnAdd.Click
'Add item to list
If (txtItem.Text <> "") And (txtPrice.Text <> "") Then
sw.WriteLine(txtItem.Text & "," & txtPrice.Text)
'Reset input text boxes.
txtItem.Clear()
txtPrice.Clear()
Else
MessageBox.Show("Must enter item name and price.")
End If
txtItem.Focus()
'Reset focus
End Sub
Private Sub btnDone_Click(...) Handles btnDone.Click
sw.Close()
Me.Close()
'Terminate the program.
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 260 of 443)
25. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Cowboy.txt")
Dim lines(4) As String
For i As Integer = 0 To 4
lines(i) = sr.ReadLine
Next
Dim query = From line In lines
Let data = line.Split(","c)
Let item = data(0)
Let cost = (CDbl(data(1))).ToString("C")
Select item, cost
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
End Sub
26. Private Sub frmCreateFiles_Load(...) Handles MyBase.Load
Dim sw As IO.StreamWriter = IO.File.CreateText("Greetings.txt")
sw.WriteLine("Hello")
sw.Close()
End Sub
Private Sub btnDelete_Click(...) Handles btnDelete.Click
Dim sw As IO.StreamWriter = IO.File.AppendText("Greetings.txt")
sw.WriteLine("Hi")
Try
IO.File.Delete("Greetings.txt")
Catch ex As Exception
sw.Close()
IO.File.Delete("Greetings.txt")
End Try
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 261 of 443)
27. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Numbers.txt")
Dim counter As Integer = 0
Dim num As Integer
Do Until sr.EndOfStream
num = CInt(sr.ReadLine)
counter += 1
Loop
txtOutput.Text = CStr(counter)
sr.Close()
End Sub
28. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Numbers.txt")
Dim num As Integer
Dim max As Integer = CInt(sr.ReadLine)
Do Until sr.EndOfStream
num = CInt(sr.ReadLine)
If (num > max) Then
max = num
End If
Loop
txtOutput.Text = CStr(max)
sr.Close()
End Sub
29. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Numbers.txt")
Dim num As Integer
Dim min As Integer = CInt(sr.ReadLine)
Do Until sr.EndOfStream
num = CInt(sr.ReadLine)
If (num < min) Then
min = num
End If
Loop
txtOutput.Text = CStr(min)
sr.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 262 of 443)
30. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Numbers.txt")
Dim total As Integer = 0
Dim num As Double
Do Until sr.EndOfStream
num = CInt(sr.ReadLine)
total += num
Loop
txtOutput.Text = CStr(total)
sr.Close()
End Sub
31. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Numbers.txt")
Dim counter As Integer = 0
Dim total As Integer = 0
Dim num As Integer
Do Until sr.EndOfStream
num = CInt(sr.ReadLine)
counter += 1
total += num
Loop
txtOutput.Text = (total / counter).ToString("N")
sr.Close()
End Sub
32. Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Numbers.txt")
Dim num As Integer
Do Until sr.EndOfStream
num = CInt(sr.ReadLine)
Loop
txtOutput.Text = CStr(num)
sr.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 263 of 443)
33. Private Sub frmStates_Load(...) Handles MyBase.Load
Dim sr As IO.StreamReader = IO.File.OpenText("StatesBFNC.txt")
Dim line As String, n As Integer
Do
line = sr.ReadLine
n = line.IndexOf(",")
lstStates.Items.Add(line.Substring(0, n))
Loop Until sr.EndOfStream
sr.Close()
End Sub
Private Sub lstStates_SelectedIndexChanged(...) Handles _
lstStates.SelectedIndexChanged
Dim sr As IO.StreamReader = IO.File.OpenText("StatesBFNC.txt")
Dim state, line As String
state = CStr(lstStates.SelectedItem)
line = sr.ReadLine
Do Until line.StartsWith(state) Or sr.EndOfStream
line = sr.ReadLine
Loop
Dim data(4) As String
data = line.Split(","c)
txtBird.Text = data(1)
txtFlower.Text = data(2)
txtNickname.Text = data(3)
txtCapital.Text = data(4)
sr.Close()
End Sub
34. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim sr As IO.StreamReader = IO.File.OpenText("StatesBFNC.txt")
Dim flower, flowerUC, line As String
Dim data(4) As String
line = sr.ReadLine
Do
data = line.Split(","c)
flower = data(2)
flowerUC = flower.ToUpper
If flowerUC.IndexOf("ROSE") <> -1 Then
lstRoses.Items.Add(flower)
End If
line = sr.ReadLine
Loop Until sr.EndOfStream
sr.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 264 of 443)
35. Private Sub btnFind_Click(...) Handles btnDisplay.Click
Dim sr As IO.StreamReader = IO.File.OpenText("StatesBFN.txt")
Dim bird, line As String
Dim data(3) As String
Do
line = sr.ReadLine
data = line.Split(","c)
bird = data(1)
If lstBirds.Items.IndexOf(bird) = -1 Then
lstBirds.Items.Add(bird)
End If
Loop Until sr.EndOfStream
sr.Close()
txtNumber.Text = CStr(lstBirds.Items.Count)
End Sub
36. Private Sub btnFind_Click(...) Handles btnFind.Click
Dim sr As IO.StreamReader = IO.File.OpenText("StatesBFNC.txt")
Dim bird, line As String
Dim data(4) As String
line = sr.ReadLine
Do
data = line.Split(","c)
bird = data(1)
If bird.IndexOf("Cardinal") <> -1 Then
lstCardinal.Items.Add(data(0))
End If
line = sr.ReadLine
Loop Until sr.EndOfStream
sr.Close()
End Sub
37. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim srVar As IO.StreamReader = IO.File.OpenText("Gettysburg.txt")
Dim contents As String = srVar.ReadLine
srVar.Close()
MessageBox.Show(contents, "Gettysburg Address")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 265 of 443)
38. Private Sub btnAnalyze_Click(...) Handles btnAnalyze.Click
Dim letter As String
Dim max As Integer
Dim srVar As IO.StreamReader = IO.File.OpenText("Gettysburg.txt")
Dim contents As String = srVar.ReadLine
srVar.Close()
Dim words() As String = contents.Split(" "c)
txtNumWords.Text = CStr(words.Count)
contents = contents.ToUpper
'Create an array where each element corresponds to a letter
Dim alphabet(25) As Integer
For i As Integer = 0 To contents.Length - 1
letter = contents.Substring(i, 1)
If Asc(letter) >= 65 Then
alphabet(Asc(letter) - 65) += 1
End If
Next
'Find letter(s) that appear most frequently
max = alphabet(0)
For i As Integer = 1 To 25
If alphabet(i) > max Then
max = alphabet(i)
letter = Chr(i + 65)
End If
Next
For i As Integer = 0 To 25
If alphabet(i) = max Then
txtMost.Text &= " " & Chr(i + 65)
End If
Next
txtMost.Text &= " " & CStr(max)
'Find letters that appear just once
For i As Integer = 0 To 25
If alphabet(i) = 1 Then
txtOnce.Text &= " " & Chr(i + 65)
End If
Next
'Find letters that do not appear
For i As Integer = 0 To 25
If alphabet(i) = 0 Then
txtNever.Text &= " " & Chr(i + 65)
End If
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 266 of 443)
39. Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Temperatures.txt")
Dim num, sum, high, low As Double
num = CDbl(sr.ReadLine)
sum += num
high = num
low = num
Do Until sr.EndOfStream
num = CDbl(sr.ReadLine)
sum += num
If num > high Then
high = num
End If
If num < low Then
low = num
End If
Loop
txt24hrs.Text = (sum / 24).ToString("N2")
txtHigh_Low.Text = ((high + low) / 2).ToString("N2")
sr.Close()
End Sub
EXERCISES 8.3
1. No
2. No
3. No
4. Yes
5. No
6. No
7. No
8. No
9. No
10. No
11. <?xml version='1.0'?>
<!-- This file contains the ages of the presidents when inaugurated.-->
<Presidents>
<president>
<name>George Washington</name>
<ageAtInauguation>57</ageAtInauguation>
</president>
<president>
<name>John Adams</name>
<ageAtInauguation>61</ageAtInauguation>
</president>
</Presidents>
12. <?xml version="1.0" ?>
<!-- This file contains data on each Supreme Court justice. -->
<Supreme_Court>
<justice>
<firstName>Samuel</firstName>
<secondName>Alito</secondName>
<appointingPres>George W. Bush</appointingPres>
<state>NJ</state>
<yrAppointed>2006</yrAppointed>
<yrLeft>0</yrLeft>
</justice>
<justice>
<firstName>Henry</firstName>
<secondName>Baldwin</secondName>
<appointingPres>Andrew Jackson</appointingPres>
<state>PA</state>
<yrAppointed>1830</yrAppointed>
<yrLeft>1844</yrLeft>
</justice>
</Supreme_Court>© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 267 of 443)
13. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates.xml")
Dim query = From st In stateData.Descendants("state")
Let pop = CInt(st.<population>.Value)
Select pop
txtOutput.Text = (query.Sum).ToString("N0")
End Sub
14. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates. xml ")
Dim query = From st In stateData.Descendants("state")
Let area = CInt(st.<area>.Value)
Select area
txtOutput.Text = (query.Sum).ToString("N0") & " square miles"
End Sub
15. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates.xml")
Dim queryPop = From st In stateData.Descendants("state")
Let pop = CInt(st.<population>.Value)
Select pop
Dim queryArea = From st In stateData.Descendants("state")
Let area = CInt(st.<area>.Value)
Select area
txtOutput.Text = (queryPop.Sum / queryArea.Sum).ToString("N") &
" people per square mile"
End Sub
16. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates. xml ")
Dim query1 = From st In stateData.Descendants("state")
Let name = st.<name>.Value
Let len = name.Length
Order By len Descending
Select len
Dim maxLength As Integer = query1.First
Dim query2 = From st In stateData.Descendants("state")
Let name = st.<name>.Value
Let len = name.Length
Where len = maxLength
Select name
lstOutput.DataSource = query2.ToList
lstOutput.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 268 of 443)
17. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates.xml")
Dim query = From st In stateData.Descendants("state")
Let name = st.<name>.Value
Let area = CDbl(st.<area>.Value)
Let formattedArea = area.ToString("N0")
Where area > 100000
Order By area Descending
Select name, formattedArea
dgvStates.DataSource = query.ToList
dgvStates.CurrentCell = Nothing
dgvStates.Columns("name").HeaderText = "State"
dgvStates.Columns("formattedArea").HeaderText = "Area"
End Sub
18. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates.xml")
Dim query = From st In stateData.Descendants("state")
Let name = st.<name>.Value
Let pop = CDbl(st.<population>.Value)
Let formattedPop = pop.ToString("N0")
Where pop < 1000000
Order By pop Ascending
Select name, formattedPop
dgvStates.DataSource = query.ToList
dgvStates.CurrentCell = Nothing
dgvStates.Columns("name").HeaderText = "State"
dgvStates.Columns("formattedPop").HeaderText = "Population"
End Sub
19. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates.xml")
Dim query1 = From st In stateData.Descendants("state")
Let name = st.<name>.Value
Let numVowels = NumberOfVowels(name)
Order By numVowels Descending
Select numVowels
Dim maxVowels As Integer = query1.First
Dim query2 = From st In stateData.Descendants("state")
Let name = st.<name>.Value
Where NumberOfVowels(name) = maxVowels
Select name
lstOutput.DataSource = query2.ToList
lstOutput.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 269 of 443)
Function NumberOfVowels(word As String) As Integer
word = word.ToUpper
Dim num As Integer = 0
If (word.IndexOf("A") <> -1) Then
num += 1
End If
If (word.IndexOf("E") <> -1) Then
num += 1
End If
If (word.IndexOf("I") <> -1) Then
num += 1
End If
If (word.IndexOf("O") <> -1) Then
num += 1
End If
If (word.IndexOf("U") <> -1) Then
num += 1
End If
Return num
End Function
20. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim stateData As XElement = XElement.Load("USStates.xml")
Dim query = From st In stateData.Descendants("state")
Let name = st.<name>.Value.ToUpper
Let abbrev = st.<abbreviation>.Value
Where Not name.StartsWith(abbrev)
Order By abbrev Ascending
Select name, abbrev
dgvStates.DataSource = query.ToList
dgvStates.CurrentCell = Nothing
dgvStates.Columns("name").HeaderText = "State"
dgvStates.Columns("abbrev").HeaderText = "Abbreviation"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 270 of 443)
21. Dim colleges As XElement = XElement.Load("Colleges.xml")
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display the colleges in Colleges.xml located in the given state
Dim chosenState As String = mtbState.Text.ToUpper
'mask LL
Dim query = From col In colleges.Descendants("college")
Let name = col.<name>.Value
Let state = col.<state>.Value
Let yearFounded = col.<yearFounded>.Value
Where state = chosenState
Order By name Ascending
Select name & " " & yearFounded
lstColleges.DataSource = query.ToList
lstColleges.SelectedItem = Nothing
End Sub
22. Dim colleges As XElement = XElement.Load("Colleges.xml")
Private Sub frmColleges_Load(...) Handles MyBase.Load
Dim query = From col In colleges.Descendants("college")
Let name = col.<name>.Value
Order By name Ascending
Select name
lstColleges.DataSource = query.ToList
End Sub
Private Sub lstColleges_SelectedIndexChanged(...) Handles _
lstColleges.SelectedIndexChanged
Dim chosenCollege As String = lstColleges.Text
Dim query = From col In colleges.Descendants("college")
Let name = col.<name>.Value
Let state = col.<state>.Value
Let yearFounded = col.<yearFounded>.Value
Where name = chosenCollege
Select state, yearFounded
txtState.Text = query.First.state
txtYear.Text = query.First.yearFounded
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 271 of 443)
23.Dim colleges As XElement = XElement.Load("Colleges.xml")
Private Sub frmColleges_Load(...) Handles MyBase.Load
'Place the years for each college into the array schools
Dim query = From col In colleges.Descendants("college")
Let yearFounded = col.<yearFounded>.Value
Order By yearFounded Ascending
Select yearFounded
Distinct
lstYears.DataSource = query.ToList
lstYears.SelectedItem = Nothing
End Sub
Private Sub lstYears_SelectedIndexChanged(...) Handles _
lstYears.SelectedIndexChanged
Dim chosenYear As String = lstYears.Text
Dim query = From col In colleges.Descendants("college")
Let name = col.<name>.Value
Let yearFounded = col.<yearFounded>.Value
Where yearFounded = chosenYear
Select name
lstColleges.DataSource = query.ToList
lstColleges.SelectedItem = Nothing
End Sub
24. Dim colleges As XElement = XElement.Load("Colleges.xml")
Private Sub frmColleges_Load(...) Handles MyBase.Load
Dim query = From col In colleges.Descendants("college")
Let name = col.<name>.Value
Let state = col.<state>.Value
Let yearFounded = col.<yearFounded>.Value
Order By state, yearFounded
Select name, state
dgvColleges.DataSource = query.ToList
dgvColleges.CurrentCell = Nothing
dgvColleges.Columns("name").HeaderText = "College"
dgvColleges.Columns("state").HeaderText = "State"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 272 of 443)
25(a).
Private Sub btnSenate_Click(...) Handles btnSenate.Click
Dim sr As IO.StreamReader = IO.File.OpenText("Senate113.txt")
Dim sw As IO.StreamWriter = IO.File.CreateText("Senate113.xml")
sw.WriteLine("<?xml version='1.0'?>")
sw.WriteLine("<!-- This file contains data on the 113th Senate -->")
sw.WriteLine("<Senate113>")
Dim temp As String = ""
Do Until sr.EndOfStream
temp = sr.ReadLine
sw.WriteLine(" <senator>")
sw.WriteLine("
<name>" & temp.Split(","c)(0) & "</name>")
sw.WriteLine("
<state>" & temp.Split(","c)(1) & "</state>")
sw.WriteLine("
<party>" & temp.Split(","c)(2) & "</party>")
sw.WriteLine(" </senator>")
Loop
sw.WriteLine("</Senate113>")
sr.Close()
sw.Close()
MessageBox.Show("File Created")
End Sub
25(b).
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim senateData As XElement = XElement.Load("Senate113.xml")
Dim query = From st In senateData.Descendants("senator")
Let name = st.<name>.Value
Let state = st.<state>.Value
Let party = st.<party>.Value
Order By state, name Ascending
Select name, state, party
dgvSenators.DataSource = query.ToList
dgvSenators.CurrentCell = Nothing
dgvSenators.Columns("name").HeaderText = "Senator"
dgvSenators.Columns("state").HeaderText = "State"
dgvSenators.Columns("party").HeaderText = "Party Affiliation"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 273 of 443)
26(a).
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim sluggerData As XElement = XElement.Load("Top25HR.xml")
Dim query = From st In sluggerData.Descendants("player")
Let name = st.<name>.Value
Let atBats = st.<atBats>.Value
Let homeRuns = st.<homeRuns>.Value
Order By homeRuns Descending
Select name, atBats, homeRuns
dgvSenators.DataSource = query.ToList
dgvSenators.CurrentCell = Nothing
dgvSenators.Columns("name").HeaderText = "Player"
dgvSenators.Columns("atBats").HeaderText = "At Bats"
dgvSenators.Columns("homeRuns").HeaderText = "Home Runs"
End Sub
26(b).
Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim sluggerData As XElement = XElement.Load("Top25HR.xml")
Dim query = From st In sluggerData.Descendants("player")
Let name = st.<name>.Value
Let atBats = st.<atBats>.Value
Let homeRuns = st.<homeRuns>.Value
Let line = name & "," & atBats & "," & homeRuns
Select line
IO.File.WriteAllLines("Top25HR.txt", query.ToArray)
MessageBox.Show("File Created")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 274 of 443)
CHAPTER 8 PROGRAMMING PROJECTS
1. Private Sub btnDisplay_Click(...) Handles btnCreate.Click
Dim query = From line In IO.File.ReadAllLines("ALE.txt")
Let data = line.Split(","c)
Let team = data(0)
Let wins = CInt(data(1))
Let losses = CInt(data(2))
Let pct = wins / (wins + losses)
Let formattedPct = pct.ToString("N3")
Order By pct Descending
Select team & "," & wins & "," & losses & "," & formattedPct
IO.File.WriteAllLines("OrderedALE.txt", query.ToArray)
End Sub
2(a).
Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim query1 = From senator In IO.File.ReadAllLines("Senate112.txt")
Select senator
Dim query2 = From senator In IO.File.ReadAllLines("RetiredSen.txt")
Select senator
Dim query3 = From senator In IO.File.ReadAllLines("NewSen.txt")
Select senator
Dim query4 = From senator In query1.Except(query2)
Select senator
Dim query5 = From senator In query4.Concat(query3)
Order By senator.Split(","c)(1)
Select senator
IO.File.WriteAllLines("Senate113.txt", query5)
MessageBox.Show("File Created")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 275 of 443)
2(b).
Private Sub btnCount_Click(...) Handles btnCount.Click
Dim senators() As String = IO.File.ReadAllLines("Senate113.txt")
Dim queryDem = From senator In senators
Let data = senator.Split(","c)
Let party = data(2)
Where party = "D"
Select party
txtDemocrats.Text = CStr(queryDem.Count)
Dim queryRep = From senator In senators
Let data = senator.Split(","c)
Let party = data(2)
Where party = "R"
Select party
txtRepublicans.Text = CStr(queryRep.Count)
Dim queryInd = From senator In senators
Let data = senator.Split(","c)
Let party = data(2)
Where party = "I"
Select party
txtIndependents.Text = CStr(queryInd.Count)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 276 of 443)
2(c). Dim senators() As String = IO.File.ReadAllLines("Senate113.txt")
Private Sub btnCount_Click(...) Handles btnCount.Click
Dim query = From senator In senators
Let data = senator.Split(","c)
Let state = data(1)
Select state
Distinct
Dim total As Integer = 0
For Each state In query
If SameParty(state) Then
total += 1
End If
Next
txtSameParty.Text = CStr(total)
End Sub
Function SameParty(state As String) As Boolean
Dim query = From senator In senators
Let data = senator.Split(","c)
Where data(1) = state
Let party = data(2)
Select party
If (query.First = query.Last) Then
Return True
Else
Return False
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 277 of 443)
2(d)Dim senators() As String = IO.File.ReadAllLines("Senate113.txt")
Private Sub frmSenate_Load(...) Handles MyBase.Load
Dim query = From senator In senators
Let data = senator.Split(","c)
Let state = data(1)
Select state
Distinct
lstStates.DataSource = query.ToList
lstStates.SelectedItem = Nothing
End Sub
Private Sub lstStates_SelectedIndexChangedc Handles _
lstStates.SelectedIndexChanged
Dim query = From senator In senators
Let data = senator.Split(","c)
Let name = data(0)
Let state = data(1)
Where state = lstStates.Text
Select name
lstSenators.DataSource = query.ToList
lstSenators.SelectedItem = Nothing
End Sub
3(a)Dim sr As IO.StreamReader = IO.File.OpenText("Names.txt")
Dim sw As IO.StreamWriter = IO.File.CreateText("NewFile.txt")
Private Sub btnInsert_Click(...) Handles btnInsert.Click
Dim newName As String = txtName.Text, name As String
Dim insertFlag As Boolean = False
Do Until sr.EndOfStream
name = sr.ReadLine
Select Case newName
Case Is < name
sw.WriteLine(newName)
insertFlag = True
sw.WriteLine(name)
Finish()
Exit Do
Case name
Finish()
Exit Do
Case Is > name
sw.WriteLine(name)
End Select
Loop
If Not insertFlag Then
sw.WriteLine(newName)
End If
sr.Close()
sw.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 278 of 443)
Sub Finish()
Dim nom As String
Do Until sr.EndOfStream
nom = sr.ReadLine
sw.WriteLine(nom)
Loop
sr.Close()
sw.Close()
End Sub
3(b).
Private Sub btnInsert_Click(...) Handles btnInsert.Click
Dim newName = txtName.Text
Dim query1 = From name In IO.File.ReadAllLines("Names.txt")
Select name
Dim names() = query1.ToArray
Dim n = names.Count - 1
ReDim Preserve names(n + 1)
names(n + 1) = newName
Dim query2 = From name In names
Order By name
Select name
Distinct
IO.File.WriteAllLines("NewFile.txt", query2.ToArray)
End Sub
4.
Dim fileName As String = ""
'Current phone directory
Private Sub frmPhone_Load(...) Handles MyBase.Load
DisplayDirectories()
End Sub
Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim dirNames() As String = IO.File.ReadAllLines("Directories.txt")
Dim sw As IO.StreamWriter = IO.File.AppendText("Directories.txt")
Dim newDir As String = InputBox("Enter a file name.").ToUpper
If (Array.IndexOf(dirNames, newDir) = -1) Then
sw.WriteLine(newDir)
Dim sw2 As IO.StreamWriter = IO.File.CreateText(newDir)
sw2.Close()
End If
sw.Close()
DisplayDirectories()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 279 of 443)
Private Sub btnOpen_Click(...)
MessageBox.Show("Click on an existing phone directory.")
End Sub
Sub DisplayDirectories()
lstDirs.Items.Clear()
If IO.File.Exists("Directories.txt") Then
Dim query = From phoneDir In IO.File.ReadAllLines("Directories.txt")
Order By phoneDir
Select phoneDir
For Each phoneDir In query
lstDirs.Items.Add(phoneDir)
Next
End If
End Sub
Private Sub lstDirs_SelectedIndexChanged(...) Handles _
lstDirs.SelectedIndexChanged
fileName = lstDirs.Text
txtCurrent.Text = lstDirs.Text
End Sub
Private Sub btnAdd_Click(...) Handles btnAdd.Click
'Add name to directory (do not keep the file open).
If (txtName.Text.Trim.Length = 0) Or
(txtPhoneNumber.Text.Trim.Length = 0) Then
MessageBox.Show("You must enter a name and number.")
Else
Dim sw As IO.StreamWriter = IO.File.AppendText(fileName)
sw.WriteLine(txtName.Text & "," & txtPhoneNumber.Text)
sw.Close()
txtName.Clear()
txtPhoneNumber.Clear()
txtName.Focus()
End If
End Sub
Private Sub btnRemove_Click(...) Handles btnRemove.Click
Dim query = From line In IO.File.ReadAllLines(fileName)
Let name = line.Split(","c)(0)
Let phoneNum = line.Split(","c)(1)
Where name <> txtName.Text
Select name & "," & phoneNum
IO.File.WriteAllLines(fileName, query.ToArray)
txtName.Clear()
txtPhoneNumber.Clear()
txtName.Focus()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 280 of 443)
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
If ((fileName <> "") And IO.File.Exists(fileName)) Then
Dim query = From line In IO.File.ReadAllLines(fileName)
Let name = line.Split(","c)(0)
Let phoneNum = line.Split(","c)(1)
Order By name
Select name, phoneNum
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Name"
dgvOutput.Columns("phoneNum").HeaderText = "Phone Number"
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 281 of 443)
5. (Assume Imports System.IO placed at top of Code Editor)
Private Sub frmUPC_Load(...) Handles MyBase.Load
File.Delete("Items.txt")
mtbUPC.Focus()
End Sub
Private Sub btnNewCustomer_Click(...) Handles btnNewCustomer.Click
File.Delete("Items.txt")
lstReceipt.Items.Clear()
mtbUPC.Focus()
End Sub
Private Sub btnDisplayReceipt_Click(...) Handles btnDisplayReceipt.Click
Dim UPC() As String = File.ReadAllLines("UPC.txt")
Dim total As Decimal 'sum of all item prices
Dim sr As StreamReader = File.OpenText("Items.txt")
Dim code As String
lstReceipt.Items.Clear()
Do Until sr.EndOfStream
code = sr.ReadLine
Dim query = From line In UPC
Let cd = line.Split(","c)(0)
Let desc = line.Split(","c)(1)
Let price = CDec(line.Split(","c)(2))
Where cd = code
Select desc, price
If (query.Count = 0) Then 'UPC is not in the database
lstReceipt.Items.Add("UPC " & code & " not found" &
" " & "-----")
Else
lstReceipt.Items.Add(query.First.desc & ": " &
(query.First.price).ToString("C"))
total += query.First.price
End If
Loop
sr.Close()
lstReceipt.Items.Add("TOTAL: " & total.ToString("C")
End Sub
Private Sub btnAddItem_Click(...) Handles btnAddItem.Click
Dim sw As StreamWriter = File.AppendText("Items.txt")
If isValidUPC(mtbUPC.Text) Then
sw.WriteLine(mtbUPC.Text)
lstReceipt.Items.Add(mtbUPC.Text & " -- OK")
Else
lstReceipt.Items.Add("UPC Error -- Please re-enter UPC")
End If
sw.Close()
mtbUPC.Clear()
mtbUPC.Focus()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 282 of 443)
Function isValidUPC(upc As String) As Boolean
Dim upcLength As Integer = 12
Dim d(upcLength) As Integer 'Array of digits of UPC code as numbers
Dim checksum As Integer 'Weighted sum of digits as given by formula
'Determines whether the given upc code is a valid UPC
If (upc.Length <> 12) Then
isValidUPC = False
Else
For i As Integer = 1 To upcLength
d(i) = CInt(upc.Substring(i - 1, 1))
Next i
checksum = 0
For i As Integer = 1 To (upcLength – 1) Step 2
checksum = checksum + (3 * d(i)) + d(i + 1)
Next i
If (checksum Mod 10) = 0 Then
isValidUPC = True
Else
isValidUPC = False
End If
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 283 of 443)
6.
Dim playerData As XElement = XElement.Load("Baseball.xml")
Private Sub frmBaseball_Load(...) Handles MyBase.Load
Dim query = From pl In playerData.Descendants("player")
Let team = pl.<team>.Value
Order By team
Select team
Distinct
For Each club In query
lstTeams.Items.Add(club)
Next
End Sub
Private Sub lstTeams_SelectedIndexChanged(...) Handles _
lstTeams.SelectedIndexChanged
Dim query = From pl In playerData.Descendants("player")
Let team = pl.<team>.Value
Let atBats = CInt(pl.<atBats>.Value)
Let hits = CInt(pl.<hits>.Value)
Let battingAverage = hits / atBats
Where team = lstTeams.Text
Select battingAverage
Dim teamAverage As Double = query.Average
Dim query2 = From pl In playerData.Descendants("player")
Let name = pl.<name>.Value
Let team = pl.<team>.Value
Let atBats = CInt(pl.<atBats>.Value)
Let hits = CInt(pl.<hits>.Value)
Let battingAverage = hits / atBats
Let formattedBattingAve = battingAverage.ToString("N3")
Where (team = lstTeams.Text) And (battingAverage > teamAverage)
Order By battingAverage Descending
Select name, formattedBattingAve
dgvPlayers.DataSource = query2.ToList
dgvPlayers.CurrentCell = Nothing
dgvPlayers.Columns("name").HeaderText = "Player"
dgvPlayers.Columns("formattedBattingAve").HeaderText = "Batting Average"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 284 of 443)
CHAPTER 9
EXERCISES 9.1
1.
Chopin is deleted from the list.
2.
The first item, Bach, is removed from lstBox.
3.
The currently selected item in lstBox, Mozart, is deleted.
4.
The last item, Tchaikovsky, is removed from lstBox.
5.
The item Haydn is inserted into lstBox between Chopin and Mozart.
6.
The number 2 is displayed in the text box.
7.
The names in the list box will appear in descending alphabetical order.
8.
The names in the list box will appear in descending alphabetical order.
9.
cboBox.Text = "Dante"
10. cboBox.Text = CStr(cboBox.Items(2))
11. cboBox.Items.Remove("Shakespeare")
12. cboBox.Items.Remove("Goethe")
13. cboBox.Items.RemoveAt(cboBox.Items.Count - 1)
14. For i As Integer = 0 To (cboBox.Items.Count – 1) Step 2
lstOutput.Items.Add(cboBox.Items(i))
Next
15. Dim i As Integer = 0
Do While i < cboBox.Items.Count
If (CStr(cboBox.Items(i)).Substring(0, 1) = "M") Then
cboBox.Items.RemoveAt(i)
Else
i += 1
End If
Loop
16. Dim found As Boolean = False
For i As Integer = 0 To (cboBox.Items.Count – 1)
If CStr(cboBox.Items(i)) = "Cervantes" Then
found = True
End If
Next
If found Then
txtOutput.Text = "Cervantes is in the list."
Else
txtOutput.Text = "Cervantes not found."
End If
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 285 of 443)
17. Private Sub btnSort_Click(...) Handles btnSort.Click
'Assume the String Collection Editor was filled with the numbers
'4, 9, 2, 11, 5, 17, 3, 6 at design time
Dim n As Integer = lstBox.Items.Count - 1
Dim nums(n) As Double
For i As Integer = 0 To n
nums(i) = CDbl(lstBox.Items(i))
Next
Dim query = From num In nums
Order By num Ascending
Select num
lstBox.DataSource = query.ToList
lstBox.SelectedItem = Nothing
End Sub
18. Private Sub btnRemove_Click(sender As System.Object,
e As System.EventArgs) Handles btnRemove.Click
Dim n As Integer = lstDOW.Items.Count - 1
Dim stocks(n) As String
For i As Integer = 0 To n
stocks(i) = CStr(lstDOW.Items(i))
Next
Dim query = From stock In stocks
Select stock
Distinct
lstDOW.DataSource = query.ToList
lstDOW.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 286 of 443)
19. Private Sub frmList_Load(...) Handles MyBase.Load
lblCount.Text = CStr(lstOutput.Items.Count)
End Sub
Private Sub btnAdd_Click(...) Handles btnAdd.Click
Dim first(), last() As String
Dim location As Integer = lstOutput.SelectedIndex
Dim newItem As String = InputBox("Enter item to add to list:", "Add Item")
If (location = -1) Then
ReDim first(lstOutput.Items.Count - 1)
For i As Integer = 0 To (lstOutput.Items.Count – 1)
first(i) = CStr(lstOutput.Items(i))
Next
lstOutput.Items.Clear()
lstOutput.Items.Add(newItem)
For i As Integer = 0 To (first.Count – 1)
lstOutput.Items.Add(first(i))
Next
Else
ReDim first(location - 1)
For i As Integer = 0 To (location - 1)
first(i) = CStr(lstOutput.Items(i))
Next
ReDim last(lstOutput.Items.Count - location - 1)
For i As Integer = 0 To (lstOutput.Items.Count - location - 1)
last(i) = CStr(lstOutput.Items(location + i))
Next
lstOutput.Items.Clear()
For i As Integer = 0 To (first.Count – 1)
lstOutput.Items.Add(first(i))
Next
lstOutput.Items.Add(newItem)
For i As Integer = 0 To (last.Count – 1)
lstOutput.Items.Add(last(i))
Next
End If
lblCount.Text = CStr(lstOutput.Items.Count) 'Update the counter.
End Sub
Private Sub btnDelete_Click(...) Handles btnDelete.Click
Dim location As Integer = lstOutput.SelectedIndex
'Only delete if something is selected.
If (location >= 0) Then
lstOutput.Items.RemoveAt(location)
lblCount.Text = CStr(lstOutput.Items.Count)
'Update the counter.
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 287 of 443)
20. Private Sub btnSort_Click(...) Handles btnSort.Click
Dim n As Integer = lstBox.Items.Count - 1
Dim words(n) As String
For i As Integer = 0 To n
words(i) = CStr(lstBox.Items(i))
Next
Dim query = From word In words
Order By word Descending
Select word
lstBox.DataSource = query.ToList
lstBox.SelectedItem = Nothing
End Sub
21. Private Sub btnSort_Click(...) Handles btnSort.Click
Dim names() As String = IO.File.ReadAllLines("PopularNames.txt")
lstOutput.Sorted = True
lstOutput.DataSource = names
lstOutput.SelectedItem = Nothing
For i As Integer = 0 To (lstOutput.Items.Count – 1)
names(i) = CStr(lstOutput.Items(i))
Next
IO.File.WriteAllLines("SortedNames.txt", names)
MessageBox.Show("The ordered file has been created.", "Done")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 288 of 443)
22. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Convert a length from one unit to the other.
'The inches array stores the number of inches in each unit.
Dim inches() As Double = {1, 12, 3 * 12, 100 / 2.54, 12 * 5280}
'If input is not specified, display message.
If ((lstFrom.SelectedIndex < 0) Or
(lstTo.SelectedIndex < 0) Or
(txtAmount.Text = "")) Then
MessageBox.Show("Please select both units and " &
"enter a length.", "INCOMPLETE")
Else
'Convert the first units to inches, then convert to second units.
Dim result As Double = CDbl(txtAmount.Text) *
inches(lstFrom.SelectedIndex) /
inches(lstTo.SelectedIndex)
'Display the decimal places in the result depending upon the size.
If (result < 1) Then
txtOutput.Text = result.ToString("N6")
Else
txtOutput.Text = result.ToString("N")
End If
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 289 of 443)
23. Dim ages() As String = IO.File.ReadAllLines("AgesAtInaugural.txt")
Private Sub frmPres_Load(...) Handles MyBase.Load
Dim pres() As String = IO.File.ReadAllLines("USPres.txt")
lstPres.DataSource = pres
End Sub
Private Sub lstPres_SelectedIndexChanged(...) Handles _
lstPres.SelectedIndexChanged
txtAge.Text = ages(lstPres.SelectedIndex)
End Sub
24. Private Sub btnReport_Click(...) Handles btnReport.Click
'Display the space chosen
txtAnswer.Text = "You have landed on " & cboMonopoly.Text & "."
End Sub
25. 'Note: This event procedure handles events from all three combo boxes
Private Sub SelectedIndexChanged(...) Handles _
cboBrand.SelectedIndexChanged,
cboMemory.SelectedIndexChanged,
cboMonitor.SelectedIndexChanged
'Update output if all choices have been made.
If ((cboBrand.SelectedIndex >= 0) And
(cboMemory.SelectedIndex >= 0) And
(cboMonitor.SelectedIndex >= 0)) Then
txtOutput.Text = "You have a " & cboBrand.Text &
" computer with " & cboMemory.Text &
" of memory and a " & cboMonitor.Text & " monitor."
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 290 of 443)
EXERCISES 9.2
1. The Tick event will be triggered every 5 seconds (5000 milliseconds).
2. The control Timer1 is disabled.
3. The tooltip will appear one second after the cursor is hovered over a control.
4. The tooltip will remain visible for 4 seconds after it appears.
5. A check mark appears in front of the mnuOrderAsc menu item.
6. The menu item mnuOrderAsc appears without a check mark to its left.
7. The Tick event will be triggered every intVar seconds.
8. A number from 1 through 100 is randomly selected and displayed in txtBox.
9. The name of one of the U.S. states is selected at random and displayed in txtBox.
10. A character that can be displayed with the computer keyboard is selected at random and
displayed in txtBox.
11. Two states are selected at random and displayed in the list box.
12. A card is drawn at random from a standard deck of playing cards.
13. The contents of the Clipboard are deleted.
14. The contents of the Clipboard become the string "Hello".
15. The text currently selected in txtBox, if any, is copied into the Clipboard.
16. The string “Hello” replaces the selected text in the text box. If no text is selected, the string
“Hello” is inserted into the text box at the cursor position. If the cursor is not in the
t21.xtBox, the string “Hello” is concatenated to the end of the contents of txtBox.
17. The text “el” is copied into the Clipboard.
18. The contents of the text box becomes “Hlo” and “el” is placed into the Clipboard.
19. “Hxxlo” is displayed in txtBox.
20. The contents of the Clipboard become the string "Happy".
21. The contents of the Clipboard are assigned to the variable strVar.
22. Any picture placed into the picture box will be automatically enlarged or contracted to fit the
picture box.
23. A picture of an airplane will be placed in the picture box.
24. The scroll box moves so that its left side is in the middle of the horizontal scroll bar.
25. Clicking on the arrow on either end of the scroll bar will move the button the same ("large")
distance as clicking on the bar between the scroll box and an arrow.
26. Timer1.Interval = 500
Timer1.Enabled = True
27. Timer1.Enabled = False
28. Dim randomNum As New Random()
txtBox.Text = names(randomNum.Next(0, 20))
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 291 of 443)
29. Dim randomNum As New Random()
txtBox.Text = CStr(randomNum.Next(1, 13))
30. Dim randomNum As New Random()
'A and Z have ANSI values 65 and 90.
txtBox.Text = Chr(randomNum.Next(65, 91))
31. Dim sr As IO.StreamReader = IO.Files.ReadText("Towns.txt")
Dim randomNum As New Random()
Dim num As Integer = randomNum.Next(1, 26)
Dim city As String
For i As Integer = 1 To num
city = sr.ReadLine
Next
txtBox.Text = city
32. Dim randomNum As New Random()
txtBox.Text = CStr(randomNum(1, 7) + randomNum(1, 7))
33. Dim n As Integer = rivers.Count
If (n >= 2) Then
Dim randomNum As New Random()
Dim firstNumber, secondNumber As Integer
firstNumber = randomNum.Next(0, n)
Do
secondNumber = randomNum.Next(0, n)
Until secondNumber <> firstNumber
lstBox.Items.Add(rivers(firstNumber))
lstBox.Items.Add(rivers(secondNumber))
Else
MessageBox.Show("The array has fewer than two elements.")
End If
34. txtBox.SelectedText = Clipboard.GetText
35. Clipboard.Clear
36. Clipboard.SetText("Rosebud")
37. txtBox.Copy()
38. txtBox.Cut()
39. Dim amount As Integer
amount = CInt(Clipboard.GetText)
40. txtBox.Clear()
txtBox.Paste()
41. mnuOrderDesc.Checked = False
42. mnuOrderDesc.Text = "Decreasing Order"
43. VScrollBar2.Value = VScrollBar2.Minimum
44. HScrollBar2.Value = CInt(HScrollBar2.Minimum +
(HScrollBar2.Maximum - HScrollBar2.Minimum) / 3)
45. The menu item mnuOrderAsc is grayed out and cannot be selected.
46. The menu item mnuOrderAsc is not visible in the pull-down menu.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 292 of 443)
47. Private Sub frmClock_Load(...) Handles MyBase.Load
picBox.Image = Image.FromFile("Trees.bmp")
UpdateClock()
End Sub
Private Sub tmrClock_Tick(...) Handles tmrClock.Tick
UpdateClock()
End Sub
Private Sub UpdateClock()
Dim timeStr As String = ""
timeStr = timeStr & (Hour(Now)).ToString("N0")
timeStr &= ":" & PadZero(Minute(Now))
timeStr &= ":" & PadZero(Second(Now))
lblTime.Text = timeStr
End Sub
Function PadZero(num As Integer) As String
'Pads a one-digit number with a zero
Dim result As String
result = num.ToString("N0")
If num < 10 Then
Return "0" & result
Else
Return result
End If
End Function
48. Dim randomNum As New Random()
'Random number generator
Private Sub btnToss_Click(...) Handles btnToss.Click
'Toss a coin, and keep track of results.
If randomNum.Next(0, 2) = 0 Then
txtOutcome.Text = "Heads"
txtHeads.Text = CStr(CInt(txtHeads.Text) + 1)
Else
txtOutcome.Text = "Tails"
txtTails.Text = CStr(CInt(txtTails.Text) + 1)
End If
'Display total tosses and percentage.
txtTosses.Text = CStr(CInt(txtTosses.Text) + 1)
txtPercentHeads.Text =
(CDbl(txtHeads.Text) / CDbl(txtTosses.Text)).ToString("P")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 293 of 443)
49. Private Sub btnSelect_Click(...) Handles btnSelect.Click
'Assume there are at least three members in the club.
Dim names() As String = IO.File.ReadAllLines("Members.txt")
Dim n As Integer = names.Count
Dim p As Integer
Dim randomNum As New Random()
p = randomNum.Next(0, n)
txtPresident.Text = names(p)
'Swap President with the person in the last array element.
names(p) = names(n - 1)
names(n - 1) = txtPresident.Text
'Choose a random person from first n-1 for Treasurer.
p = randomNum.Next(0, n - 1)
txtTreasurer.Text = names(p)
'Swap Treasurer with the person in the next to last array element.
names(p) = names(n - 2)
names(n - 2) = txtTreasurer.Text
'Choose a random person from first n-2 for Secretary.
p = randomNum.Next(0, n - 2)
txtSecretary.Text = names(p)
End Sub
50. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Place the alphabet into an array
Dim alphabet(25) As String
For i As Integer = 0 To 25
alphabet(i) = Chr(Asc("A") + i)
Next
'inside-out algorithm
Dim a(25) As String, k As Integer
Dim randomNum As New Random()
a(0) = alphabet(0)
For i As Integer = 1 To 25
k = randomNum.Next(0, i + 1)
a(i) = a(k)
a(k) = alphabet(i)
Next
'Display first six letters in the shuffled array
txtOutput.Clear()
For i As Integer = 0 To 5
txtOutput.Text &= a(i)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 294 of 443)
51. Private Sub tmrMoon_Tick(...) Handles tmrMoon.Tick
'Update the phase and display the image.
'Timer Interval setting is 2000; Timer Enabled setting is True
phase += 1
If phase = 9 Then
phase = 1
End If
picBox.Image = Image.FromFile("Moon" & phase & ".bmp")
End Sub
52. Private Sub btnProduce_Click(...) Handles btnProduce.Click
txtWhiteBalls.Clear()
Dim randomNum As New Random
Dim num, temp As Integer
Dim whiteNumbers(59) As Integer
For i As Integer = 1 To 59
whiteNumbers(i) = i
Next
For i As Integer = 1 To 5
num = randomNum.Next(i, 60)
Swap(whiteNumbers(i), whiteNumbers(num))
txtWhiteBalls.Text &= whiteNumbers(i) & " "
Next
num = randomNum.Next(1, 36)
txtRedBall.Text = CStr(num)
End Sub
Sub Swap(ByRef x As Integer, ByRef y As Integer)
Dim temp As Integer
temp = x
x = y
y = temp
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 295 of 443)
53. Private Sub btnCompute_Click(...) Handles btnCompute.Click
Dim match As Boolean
Dim num, i As Integer
Dim people(22) As Integer
Dim randomNum As New Random
For k As Integer = 1 To 1000
match = False
For j As Integer = 0 To 22
people(j) = randomNum.Next(1, 366)
Next
i = 0
Do Until i = 22 Or match
For j As Integer = i + 1 To 22
If people(i) = people(j) Then
match = True
End If
Next
i += 1
Loop
If match Then
num += 1
End If
Next
txtNum.Text = CStr(num / 10)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 296 of 443)
54. Private Sub btnPlay_Click(...) Handles btnPlay.Click
Dim deckOfCards(51) As String
Dim suits() As String = {"Hearts", "Diamonds", "Clubs", "Spades"}
Dim n, earnings As Integer
Dim randomNum As New Random()
Dim temp, card As String
Dim numberOfDiamonds As Integer = 0
Dim numberOfWins As Integer = 0
Dim numberOfLosses As Integer = 0
For i As Integer = 0 To 3
'Populate numbers 2 through 10.
For j As Integer = 2 To 10
deckOfCards(i * 13 + j) = j & " of " & suits(i)
Next
deckOfCards(i * 13 + 0) = "King of " & suits(i)
deckOfCards(i * 13 + 1) = "Ace of " & suits(i)
deckOfCards(i * 13 + 11) = "Jack of " & suits(i)
deckOfCards(i * 13 + 12) = "Queen of " & suits(i)
Next
For d As Integer = 1 To 1000
numberOfDiamonds = 0
'Choose and display two cards at random.
For i As Integer = 1 To 2
n = randomNum.Next(0, 53 - i)
card = deckOfCards(n)
If card.Substring(card.Length - 8) = "Diamonds" Then
numberOfDiamonds += 1
End If
'Swap the chosen card with the one at the end.
temp = deckOfCards(n)
deckOfCards(n) = deckOfCards(52 - i)
deckOfCards(52 - i) = temp
Next
If numberOfDiamonds = 0 Then
earnings -= 1
Else
earnings += 1
End If
Next
Select Case earnings
Case 0
txtResult.Text = "You broke even."
Case Is > 0
txtResult.Text = "You won " & earnings & " dollars."
Case Is < 0
txtResult.Text = "You lost " & (-1 * earnings) & " dollars."
End Select
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 297 of 443)
55. (no code)
56. Private Sub lstBox_DoubleClick(...) Handles lstBox.DoubleClick
lstBox.Items.Remove(lstBox.Text)
End Sub
57. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display the open file dialog box to get the file
Dim fileSpec As String
OpenFileDialog1.ShowDialog()
fileSpec = OpenFileDialog1.FileName
'Display picture contained in the file.
picBox.Image = Image.FromFile(fileSpec)
End Sub
58. Private Sub mnuCopy_Click(...) Handles mnuCopy.Click
'Copy selected text into Clipboard.
If txtBox.SelectedText <> "" Then
Clipboard.SetText(txtBox.SelectedText)
Else
MessageBox.Show("You must first select some text to be copied.")
End If
End Sub
Private Sub mnuPaste_Click(...) Handles mnuPaste.Click
'Paste Clipboard into text box.
txtBox.SelectedText = Clipboard.GetText
End Sub
Private Sub mnuCut_Click(...) Handles mnuCut.Click
'Copy selected text into Clipboard, and delete selected text.
If txtBox.SelectedText <> "" Then
Clipboard.SetText(txtBox.SelectedText)
txtBox.SelectedText = ""
Else
MessageBox.Show("You must first select some text to be cut.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 298 of 443)
59. Dim randomNum As New Random()
Private Sub btnPlay_Click(...) Handles btnPlay.Click
'Roll a pair of dice until 7 appears 1000 times.
Dim die1, die2 As Integer
Dim numberOfSevens As Integer = 0
Dim numberOfRolls As Integer = 0
Do
'Roll the dice
die1 = randomNum.Next(1, 7)
die2 = randomNum.Next(1, 7)
'If lucky 7, increment the sevens counter.
If (die1 + die2) = 7 Then
numberOfSevens += 1
End If
numberOfRolls += 1
'Increment the rolls counter.
Loop Until (numberOfSevens = 1000)
'Display the result to two decimal places.
txtOutput.Text = (numberOfRolls / numberOfSevens).ToString("N")
End Sub
60. Public Sub vsbFahren_Scroll(...) Handles vsbFahren.Scroll
'When Fahrenheit value changes, update the Celsius value.
'vsbFahren.Minimum = 32, vsbFahren.Maximum = 225
'vsbFahren.SmallChange = 1, vsbFahren.LargeChange = 14
txtFahren.Text = CStr(vsbFahren.Value)
Dim celsius As Integer = CInt((5 / 9) * (vsbFahren.Value - 32))
vsbCelsius.Value = celsius
txtCelsius.Text = CStr(vsbCelsius.Value)
End Sub
Public Sub vsbCelsius_Scroll(...) Handles vsbCelsius.Scroll
'When Celsius value changes, update the Fahrenheit value
'vsbCelsius.Minimum = 0, vsbCelsius.Maximum = 125
'vsbCelsius.SmallChange = 1, vsbCelsius.LargeChange = 10
txtCelsius.Text = CStr(vsbCelsius.Value)
Dim fahrenheit As Integer = CInt((9 / 5) * vsbCelsius.Value + 32)
vsbFahren.Value = fahrenheit
txtFahren.Text = CStr(vsbFahren.Value)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 299 of 443)
61. Private Sub tmrBall_Tick(...) Handles tmrBall.Tick
'Update the value of the scroll bar and label.
'Timer Interval setting is 1000
'vsbBall.Minimum = 0, vsbBall.Maximum = 10
count = count - 1
vsbBall.Value = 10 - count
lblBall.Text = CStr(count)
'If at zero, display the message and end program.
If count = 0 Then
tmrBall.Enabled = False
MessageBox.Show("HAPPY NEW YEAR", "NYE")
Me.Close()
End If
End Sub
62. Private Sub btnRollDice_Click(...) Handles btnRollDice.Click
Dim randomNum As New Random
Dim num1, num2 As Integer
Dim dicePicture1, dicePicture2 As String
num1 = randomNum.Next(1, 7)
num2 = randomNum.Next(1, 7)
dicePicture1 = "die" & CStr(num1) & ".jpg"
dicePicture2 = "die" & CStr(num2) & ".jpg"
picDie1.Image = Image.FromFile(dicePicture1)
picDie2.Image = Image.FromFile(dicePicture2)
txtSum.Text = CStr(num1 + num2)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 300 of 443)
63. Private Sub Button1_Click(...) Handles Button1.Click
Dim ranNum As New Random
Dim outcome(31), face As String
Dim numOfRuns As Integer = 0
Dim temp As Integer, result As String = ""
Dim runOfFive As Boolean = False
For i = 0 To 31
temp = ranNum.Next(0, 2)
If temp = 0 Then
outcome(i) = "H"
Else
outcome(i) = "T"
End If
result &= outcome(i)
Next
txtResult.Text = result
For i = 0 To 27
face = outcome(i)
If outcome(i + 1) = face And outcome(i + 2) = face And
outcome(i + 3) = face And outcome(i + 4) = face Then
runOfFive = True
numOfRuns += 1
End If
Next
If runOfFive Then
txtOutcome.Text = "Yes"
Else
txtOutcome.Text = "No"
End If
End Sub
EXERCISES 9.3
1. $106.00
2. John, you are not yet 21 years old.
3. Your last name begins with K.
4. The average is 90.
5. 'Form1's code
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Form2.ShowDialog()
txtQuotation.Text = Form2.quotation
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 301 of 443)
'Form2's code (Movies)
Public quotation As String
Private Sub btnProcessSelection_Click(...) Handles _
btnProcessSelection.Click
If rad1.Checked Then
quotation = "Plastics."
End If
If rad2.Checked Then
quotation = "Rosebud."
End If
If rad3.Checked Then
quotation = "That's all folks."
End If
Me.Close()
End Sub
6. 'Form Name's code
Public fullName As String
Private Sub btnExtract_Click(...) Handles btnExtract.Click
fullName = txtFull.Text
Form2.ShowDialog()
End Sub
'Form2's code (Parsed Name)
Private Sub Form2_Load(...) Handles MyBase.Load
Dim parsedName() As String = frmName.fullName.Split(" "c)
txtFirst.Text = parsedName.First
txtLast.Text = parsedName.Last
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 302 of 443)
7. 'Code for frmMillionaire
Public numberOfYrs As Integer
Public Const INTEREST_RATE As Decimal = 0.06D
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim balance As Decimal, numYears As Integer
balance = CDec(txtAmount.Text)
Do While balance < 1000000
balance += INTEREST_RATE * balance
numYears += 1
Loop
txtWhen.Text = "In " & numYears &
" years you will have a million dollars."
numberOfYrs = numYears
frmBalance.ShowDialog()
End Sub
'Code for frmBalance
Structure Year
Dim num As Integer
Dim amount As Decimal
End Structure
Private Sub frmBalance_Activated(...) Handles Me.Load
Dim a(frmMillionaire.numberOfYrs) As Year
a(0).num = 0
a(0).amount = CDec(frmMillionaire.txtAmount.Text)
For i As Integer = 1 To (a.Count – 1)
a(i).num = i
a(i).amount = (1 + frmMillionaire.INTEREST_RATE) * a(i - 1).amount
Next
Dim query = From yr In a
Let Year = yr.num
Let Amount = (yr.amount).ToString("C")
Select Year, Amount
dgvBalance.DataSource = query.ToList
dgvBalance.CurrentCell = Nothing
End Sub
Private Sub frmBalance_FormClosing(...) Handles Me.FormClosing
frmMillionaire.txtAmount.Clear()
frmMillionaire.txtWhen.Clear()
frmMillionaire.txtAmount.Focus()
End Sub
8. Structure Month
Dim number As Integer
Dim principalPaid As Decimal
Dim interestPaid As Decimal
Dim endBalance As Decimal
End Structure
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 303 of 443)
Structure EffectOfRate
Dim interestRate As Decimal
Dim monthlyPayment As Decimal
End Structure
Private Sub btnPayment_Click(...) Handles btnPayment.Click
Dim principal As Decimal 'Amount of loan
Dim yearlyRate As Decimal 'Annual rate of interest
Dim numMonths As Integer 'Number of months to repay loan
InputData(principal, yearlyRate, numMonths)
Dim monthlyRate As Decimal = yearlyRate / 12
Dim monthlyPayment As Decimal
'Calculate monthly payment
monthlyPayment = Payment(principal, monthlyRate, numMonths)
'Display results
MessageBox.Show("Monthly payment: " & monthlyPayment.ToString("C"),
"Payment")
End Sub
Private Sub btnAmort_Click(...) Handles btnAmort.Click
Dim principal As Decimal 'Amount of loan
Dim yearlyRate As Decimal 'Annual rate of interest
Dim numMonths As Integer 'Number of months to repay loan
InputData(principal, yearlyRate, numMonths)
Dim months(numMonths - 1) As Month
Dim monthlyRate As Decimal = yearlyRate / 12
Dim monthlyPayment As Decimal = Payment(principal, monthlyRate, numMonths)
months = FillMonthsArray(principal, monthlyRate, numMonths)
Dim query = From mnth In months
Let num = mnth.number
Let interest = (mnth.interestPaid).ToString("C")
Let prin = (mnth.principalPaid) .ToString("C")
Let bal = (mnth.endBalance) .ToString("C")
Select num, interest, prin, bal
frmAmort.dgvResults.DataSource = query.ToList
frmAmort.dgvResults.CurrentCell = Nothing
frmAmort.dgvResults.Columns("num").HeaderText = "Month"
frmAmort.dgvResults.Columns("interest").HeaderText =
"Amount Paid for Interest"
frmAmort.dgvResults.Columns("prin").HeaderText = "Amount Paid for Principal"
frmAmort.dgvResults.Columns("bal").HeaderText = "Balance at End of Month"
frmAmort.ShowDialog()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 304 of 443)
Private Sub btnShow_Click(...) Handles btnShow.Click
Dim principal As Decimal 'Amount of loan
Dim yearlyRate As Decimal 'Annual rate of interest
Dim numMonths As Integer 'Number of months to repay loan
InputData(principal, yearlyRate, numMonths)
Dim months(numMonths - 1) As Month
Dim monthlyRate As Decimal = yearlyRate / 12
Dim monthlyPayment As Decimal = Payment(principal, monthlyRate, numMonths)
months = FillMonthsArray(principal, monthlyRate, numMonths)
Dim beginningMonth As Integer = CInt(InputBox("Enter beginning month: "))
Dim query = From mnth In months
Where (mnth.number >= beginningMonth) And
(mnth.number < beginningMonth + 12)
Select mnth.interestPaid
MessageBox.Show("Interest Paid for year beginning with month " &
beginningMonth & ": " & (query.Sum).ToString("C"),
"Interest For Year")
End Sub
Private Sub btnRateTable_Click(...) Handles btnRateTable.Click
Dim principal As Decimal 'Amount of loan
Dim yearlyRate As Decimal 'Annual rate of interest
Dim numMonths As Integer 'Number of months to repay loan
InputData(principal, yearlyRate, numMonths)
Dim rates(16) As EffectOfRate
Dim monthlyRate As Decimal = yearlyRate / 12
'Dim monthlyPayment As Decimal = Payment(principal, monthlyRate, numMonths)
'Fill rates array
For i As Integer = 0 To 16
CDec(rates(i).interestRate = (yearlyRate - 0.01) + i * 0.00125)
rates(i).monthlyPayment = Payment(principal,
rates(i).interestRate / 12, numMonths)
Next
Dim query = From rate In rates
Let annualRate = (rate.interestRate).ToString("P3")
Let monthlyPayment = (rate.monthlyPayment).ToString("C")
Select annualRate, monthlyPayment
frmIntRate.dgvResults.DataSource = query.ToList
frmIntRate.dgvResults.CurrentCell = Nothing
frmIntRate.dgvResults.Columns("annualRate").HeaderText = "Interest Rate"
frmIntRate.dgvResults.Columns("monthlyPayment").HeaderText =
"Monthly Payment"
frmIntRate.ShowDialog()
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
End
End Sub
Sub InputData(ByRef principal As Decimal,
ByRef yearlyRate As Decimal, ByRef numMonths As Integer)
Dim percentageRate As Decimal, numYears As Integer
principal = CDec(txtPrincipal.Text)
percentageRate = CDec(txtYearlyRate.Text)
yearlyRate = percentageRate / 100
'Convert interest rate to decimal form
numYears = CInt(txtNumYears.Text)
numMonths = numYears * 12
'Duration of loan in momths
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 305 of 443)
Function Payment(principal As Decimal,
monthlyRate As Decimal, numMonths As Decimal) As Decimal
Dim estimate As Decimal
'Estimate of monthly payment
estimate = CDec(principal * monthlyRate /
(1 - (1 + monthlyRate) ^ (-numMonths)))
' Round the payment up if it there are fractions of a cent
If estimate = Math.Round(estimate, 2) Then
Return estimate
Else
Return Math.Round(estimate + 0.005D, 2)
End If
End Function
Function FillMonthsArray(principal As Decimal,
monthlyRate As Decimal, numMonths As Integer) As Month()
Dim months(numMonths - 1) As Month
Dim monthlyPayment As Decimal = Payment(principal, monthlyRate, numMonths)
months(0).number = 1
months(0).interestPaid = monthlyRate * principal
months(0).endBalance = (1 + monthlyRate) * principal - monthlyPayment
months(0).principalPaid = monthlyPayment - months(0).interestPaid
'Assign values for interior months
For i As Integer = 1 To (numMonths – 2)
months(i).number = i + 1
months(i).interestPaid = monthlyRate * months(i - 1).endBalance
months(i).endBalance = (1 + monthlyRate) * months(i - 1).endBalance monthlyPayment
months(i).principalPaid = monthlyPayment - months(i).interestPaid
Next
months(numMonths - 1).number = numMonths
months(numMonths - 1).interestPaid = monthlyRate *
months(numMonths - 2).endBalance
months(numMonths - 1).endBalance = 0
months(numMonths - 1).principalPaid = monthlyPayment months(numMonths - 1).interestPaid
Return months
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 306 of 443)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 307 of 443)
9. Form1's Code
'Class-level named constants and variables
'Data files that store information
Const INIT_FILE As String = "Initial_Info.txt"
Public Const TRANS_FILE As String = "Transactions.txt"
'Variables used for each entry
Dim isCheck As Boolean
Dim nameOnChk As String
'Name to appear on checks
Dim lastCkNum As Integer 'Number of last check written
Dim lastDpNum As Integer 'Number of last deposit slip processed
Dim curBal As Decimal
'Current balance in account
Private Sub frmAccount_Load(...) Handles MyBase.Load
'Sets the class variables from a new or existing text file
InitializeData()
'Set name and balance labels
lblName.Text = nameOnChk
txtBalance.Text = curBal.ToString("C")
'Set the date field to the current date.
txtDate.Text = CStr(Today)
SetupCheck()
ResetInput()
End Sub
Private Sub InitializeData()
If IO.File.Exists(INIT_FILE) Then
Dim data() As String
'holds the data read from the file
Dim initFileContents() As String = IO.File.ReadAllLines(INIT_FILE)
'Split the single line of the INIT_FILE using the separator
data = initFileContents.First.Split(","c)
'Load the name to appear on checks, current balance, number of
'last check written and number of last deposit slip processed
nameOnChk = data(0)
curBal = CDec(data(1))
lastCkNum = CInt(data(2))
lastDpNum = CInt(data(3))
'Possibly update the values above by looking at last record of TRANS_FILE
If IO.File.Exists(TRANS_FILE) Then
Dim transFileContents() As String = IO.File.ReadAllLines(TRANS_FILE)
data = transFileContents.Last.Split(","c)
curBal = CDec(data(2))
lastCkNum = CInt(data(3))
lastDpNum = CInt(data(4))
End If
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 308 of 443)
Else
'INIT_FILE does not exist, so get initial data from user
Dim sw As IO.StreamWriter
nameOnChk = InputBox("Name to appear on checks:")
Try
curBal = CDec(InputBox("Starting Balance:"))
'Get numbers of last check and deposit slip
lastCkNum = CInt(InputBox("Number of first check:")) - 1
lastDpNum = CInt(InputBox("Number of first deposit slip:")) - 1
'The single record in the text file records the name to
'appear on checks plus the initial data for account
Dim outputLine As String = nameOnChk & "," & curBal & "," &
lastCkNum & "," & lastDpNum
sw = IO.File.CreateText(INIT_FILE)
sw.WriteLine(outputLine)
Catch
'If a number cannot be converted then display message and quit
MessageBox.Show("Invalid number. Program terminating.", "Error")
Me.Close()
Finally
'Close the writer no matter what happens above
sw.Close()
End Try
End If
End Sub
Private Sub btnRecord_Click(...) Handles btnRecord.Click
'Store the input into the transactions file
Dim amt As Decimal
Dim transType As String
'Only store if all required fields are filled and valid
If DataValid() Then
amt = CDec(txtAmount.Text)
'Adjust balance by amount depending on check or deposit slip mode
If isCheck Then
curBal = curBal - amt
lastCkNum = CInt(txtNum.Text)
transType = "Check"
Else
curBal += amt
lastDpNum = CInt(txtNum.Text)
transType = "Deposit"
End If
txtBalance.Text = curBal.ToString("C")
'String array contains info to be stored
Dim transOutput() As String = {transType, txtToFrom.Text,
CStr(curBal), CStr(lastCkNum), CStr(lastDpNum), CStr(amt),
txtMemo.Text, txtDate.Text}
Dim sw As IO.StreamWriter = IO.File.AppendText(TRANS_FILE)
'Append the info to the text file, separated by the separator
sw.WriteLine(Join(transOutput, ","))
sw.Close()
'Reset input text boxes to blank for next entry
ResetInput()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 309 of 443)
Function DataValid() As Boolean
'Returns True if all data are valid, or displays a message if not
Dim errorMessage As String = ""
'If one of the two essential pieces of information
'is missing, assign its name to errorMessage
If txtToFrom.Text.Trim = "" Then
If isCheck Then
errorMessage = "Pay To"
Else
errorMessage = "Source"
End If
txtToFrom.Focus()
ElseIf txtAmount.Text.Trim = "" Then
errorMessage = "Amount"
txtAmount.Focus()
End If
'If no errors yet then check syntax of the two numerical fields
If errorMessage = "" Then
'Check syntax of the amount field (Decimal)
Try
If CDec(txtAmount.Text) <= 0 Then
errorMessage = "The amount must be greater than zero."
txtAmount.Focus()
End If
Catch exc As InvalidCastException
errorMessage = "The amount " & txtAmount.Text & " is invalid."
txtAmount.Focus()
End Try
Else
errorMessage = "The '" & errorMessage & "' field must be filled."
End If
'Display error message if available
If errorMessage = "" Then
'All required data fields have been filled; recording can proceed
Return True
Else
'Advise user of invalid data
MessageBox.Show(errorMessage & " Please try again.")
Return False
End If
End Function
Private Sub btnMode_Click(...) Handles btnMode.Click
'Toggle mode between Check and Deposit Slip
If isCheck Then
SetupDeposit()
Else
SetupCheck()
End If
'Set fields for next entry
ResetInput()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 310 of 443)
Sub SetupCheck()
'Prepare form for the entry of a check
isCheck = True
Me.Text = "Check" 'Sets the title bar of the form
lblToFrom.Text = "Pay To"
btnRecord.Text = "&Record This Check"
btnMode.Text = "&Switch to Deposits"
Me.BackColor = Color.LightGray
End Sub
Sub SetupDeposit()
'Prepare form for the entry of a deposit
isCheck = False
Me.Text = "Deposit Slip"
'Sets the title bar of the form
lblToFrom.Text = "Source"
btnRecord.Text = "&Record This Deposit"
btnMode.Text = "&Switch to Checks"
Me.BackColor = Color.Yellow
End Sub
Sub ResetInput()
'Reset all text entry fields except date
txtToFrom.Clear()
txtAmount.Clear()
txtMemo.Clear()
If isCheck Then
'Make txtNum text box reflect next check number
txtNum.Text = CStr(lastCkNum + 1)
Else
'Make txtNum text box reflect next deposit slip number
txtNum.Text = CStr(lastDpNum + 1)
End If
'Set focus on to/from control for the next entry
txtToFrom.Focus()
End Sub
Private Sub btnReport_Click(...) Handles btnReport.Click
If IO.File.Exists(TRANS_FILE) Then
Form2.ShowDialog()
Else
MessageBox.Show("There are no transactions to report.")
End If
End Sub
Function FormNumber(type As String, checkNumber As String,
depositNumber As String) As String
If type = "Check" Then
Return "Check #" & checkNumber
Else
Return "Deposit #" & depositNumber
End If
End Function
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 311 of 443)
Private Sub btnQuit_Click(...) Handles btnQuit.Click
Me.Close()
'Exit the program
End Sub
Form2's Code
Private Sub Form2_Load(...) Handles MyBase.Load
Dim transFileContents() = IO.File.ReadAllLines(frmAccount.TRANS_FILE)
Dim query = From trans In transFileContents
Let data = trans.Split(","c)
Let transDate = CDate(data(7))
Let number = frmAccount.FormNumber(data(0), data(3), data(4))
Let toFrom = data(1)
Let Memo = data(6)
Let Amount = (CDec(data(5))).ToString("C")
Let Balance = (CDec(data(2))).ToString("C")
Select transDate, number, toFrom, Memo, Amount, Balance
dgvTransactions.DataSource = query.ToList
dgvTransactions.Columns("transDate").HeaderText = "Transaction Date"
dgvTransactions.Columns("number").HeaderText = "Description"
dgvTransactions.Columns("toFrom").HeaderText = "Recipient or Source"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 312 of 443)
10. 'Form1's code
Structure Student
Dim name As String
Dim exam1 As Double
Dim exam2 As Double
Dim exam3 As Double
End Structure
Public numStudents As Integer = 0
Public students(50) As Student
Public totalGrades As Double = 0
Private Sub Form1_Load(...) Handles MyBase.Load
Form2.ShowDialog()
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
txtAverage.Text = (totalGrades / (3 * numStudents)).ToString("N1")
ReDim Preserve students(numStudents - 1)
Dim query = From student In students
Let Name = student.name
Let Average = ((student.exam1 + student.exam2 +
student.exam3) / 3).ToString("N0")
Select Name, Average
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
End Sub
'Form2's code
Private Sub Form2_Load(...) Handles MyBase.Load
Me.Text = "Student #1"
End Sub
Private Sub btnRecord_Click(...) Handles btnRecord.Click
Dim sum As Double
Form1.students(Form1.numStudents).name = txtName.Text
Form1.students(Form1.numStudents).exam1 = CDbl(txtExam1.Text)
Form1.students(Form1.numStudents).exam2 = CDbl(txtExam2.Text)
Form1.students(Form1.numStudents).exam3 = CDbl(txtExam3.Text)
sum = CDbl(txtExam1.Text) + CDbl(txtExam2.Text) + CDbl(txtExam3.Text)
Form1.totalGrades += sum
txtName.Clear()
txtExam1.Clear()
txtExam2.Clear()
txtExam3.Clear()
txtName.Focus()
Form1.numStudents += 1
Me.Text = "Student #" & (Form1.numStudents + 1)
End Sub
Private Sub btnTerminate_Click(...) Handles btnTerminate.Click
Me.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 313 of 443)
11. 'Form1's code (Customer)
Private Sub btnGet_Click(...) Handles btnGet.Click
If radBillCust.Checked Then
Form2.ShowDialog()
Else
Form3.ShowDialog()
End If
End Sub
'Form2's code (Customer Info)
Private Sub Form2_Load(...) Handles MyBase.Load
txtName.Text = Form1.txtName.Text
End Sub
Private Sub btnRecord_Click(...) Handles btnRecord.Click
Dim city, state, zip As String
Form1.lstOutput.Items.Add("Mail bill to:")
Form1.lstOutput.Items.Add(txtName.Text)
Form1.lstOutput.Items.Add(txtAddress.Text)
city = txtCity.Text
state = cboState.Text
zip = txtZip.Text
Form1.lstOutput.Items.Add(city & ", " & state & " " & zip)
Me.Close()
End Sub
'Form3's code (Credit Card Info)
Private Sub Form3_Load(...) Handles MyBase.Load
Dim num As Integer = Today.Year
For i As Integer = num To (num + 5)
cboYear.Items.Add(i)
Next
End Sub
Private Sub btnRecord_Click(...) Handles btnRecord.Click
Form1.lstOutput.Items.Add("Bill " & cboCard.Text)
Form1.lstOutput.Items.Add("Name on card: " & txtName.Text)
Form1.lstOutput.Items.Add("Card number: " & txtCardNumber.Text)
Form1.lstOutput.Items.Add("Expiration date: " &
cboMonth.Text & "/" & cboYear.Text)
Me.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 314 of 443)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 315 of 443)
12. 'frmNumber's code
Private Sub btnShow_Click(...) Handles btnShow.Click
'Display the second form, and get the number.
frmButtons.ShowDialog()
'After the second form is closed, display the value of
'its variable number in the first form's text box.
txtOutput.Text = frmButtons.number
End Sub
'frmButton's code
Public number As String = ""
Private Sub btn1_Click(...) Handles btn1.Click
dial(1)
End Sub
Private Sub btn2_Click(...) Handles btn2.Click
dial(2)
End Sub
Private Sub btn3_Click(...) Handles btn3.Click
dial(3)
End Sub
Private Sub btn4_Click(...) Handles btn4.Click
dial(4)
End Sub
Private Sub btn5_Click(...) Handles btn5.Click
dial(5)
End Sub
Private Sub btn6_Click(...) Handles btn6.Click
dial(6)
End Sub
Private Sub btn7_Click(...) Handles btn7.Click
dial(7)
End Sub
Private Sub btn8_Click(...) Handles btn8.Click
dial(8)
End Sub
Private Sub btn9_Click(...) Handles btn9.Click
dial(9)
End Sub
Private Sub btn0_Click(...) Handles btn0.Click
dial(0)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 316 of 443)
Sub dial(num As Integer)
'Add the number to the result, with a hyphen in its fourth position.
If number.Length = 3 Then
number &= "-"
End If
number &= CStr(num)
txtOutput.Text = number
End Sub
Private Sub btnClear_Click(...) Handles btnClear.Click
'Clear the output.
txtOutput.Clear()
number = ""
End Sub
Private Sub btnEnter_Click(...) Handles btnEnter.Click
'Make frmButtons disappear. The number dialed will
'then appear in frmNumbers's text box.
Me.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 317 of 443)
EXERCISES 9.4
1. Private Sub btnDraw_Click(...) Handles btnDraw.Click
Dim gr As Graphics = picBox.CreateGraphics
Dim x As Double = picBox.Width / 2
Dim y As Double = picBox.Height / 2
Dim r As Double = x / 2
If r > y / 2 Then
r = y / 2
End If
gr.FillEllipse(Brushes.Black, CSng(x - r), CSng(y - r),
CSng(2 * r), CSng(2 * r))
End Sub
2. Private Sub btnDraw_Click(...) Handles btnDraw.Click
Dim gr As Graphics = picBox.CreateGraphics
Dim x As Double = picBox.Width / 2
Dim y As Double = picBox.Height / 2
Dim r As Double = x / 2
If r > y / 2 Then
r = y / 2
End If
gr.FillEllipse(Brushes.Black, CSng(x), CSng(y - r), CSng(2 * r), CSng(2 * r))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 318 of 443)
3. Private Sub btnDraw_Click(...) Handles btnDraw.Click
Dim gr As Graphics = picBox.CreateGraphics
Dim x As Double = picBox.Width / 2
Dim y As Double = picBox.Height / 2
Dim r As Double = 20
gr.FillEllipse(Brushes.Red, CSng(x - r), CSng(y - r),
CSng(2 * r), CSng(2 * r))
r = 19
gr.FillEllipse(Brushes.White, CSng(x - r), CSng(y - r),
CSng(2 * r), CSng(2 * r))
End Sub
4. Private Sub btnDraw_Click(...) Handles btnDraw.Click
Dim gr As Graphics = picBox.CreateGraphics
gr.DrawLine(Pens.Red, 5, 100, 100, 5)
gr.DrawLine(Pens.Red, 100, 5, 195, 100)
gr.DrawLine(Pens.Red, 5, 100, 195, 100)
End Sub
5. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Create flag of Italy
Dim gr As Graphics = picFlag.CreateGraphics
Dim br() As Brush = {Brushes.Green, Brushes.White, Brushes.Red}
'picFlag.Width = 149; picFlag.Height = 99
For i As Integer = 0 To 2
gr.FillRectangle(br(i), 0 + i * 50, 0, 50, 99)
Next
gr.DrawLine(Pens.Black, 0, 0, 148, 0)
'top border
gr.DrawLine(Pens.Black, 0, 0, 0, 98)
'left border
gr.DrawLine(Pens.Black, 0, 98, 148, 98) 'bottom border
gr.DrawLine(Pens.Black, 148, 0, 148, 98) 'right border
End Sub
Italy
Switzerland
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 319 of 443)
6. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Create Swiss flag
Dim gr As Graphics = picFlag.CreateGraphics
'picFlag.Width = 99, picFlag.Height = 99
gr.FillRectangle(Brushes.Red, 0, 0, 98, 98)
gr.FillRectangle(Brushes.White, 40, 18, 18, 63)
gr.FillRectangle(Brushes.White, 18, 40, 63, 18)
End Sub
7. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Create flag of Niger
Dim gr As Graphics = picFlag.CreateGraphics
Dim br() As Brush = {Brushes.Orange, Brushes.White, Brushes.Green}
Dim r As Integer = 12
'radius of circle
'picFlag.Width = 149; picFlag.Height = 99
For i As Integer = 0 To 2
gr.FillRectangle(br(i), 0, 0 + i * 33, 149, 33)
Next
gr.FillPie(Brushes.Orange, 75 - r, 49 - r, 2 * r, 2 * r, 0, 360)
gr.DrawLine(Pens.Black, 0, 0, 148, 0)
'top border
gr.DrawLine(Pens.Black, 0, 0, 0, 98)
'left border
gr.DrawLine(Pens.Black, 0, 98, 148, 98) 'bottom border
gr.DrawLine(Pens.Black, 148, 0, 148, 98) 'right border
End Sub
Niger
Greenland
8. Private Sub btnCreate_Click(...) Handles btnCreate.Click
'Create flag of Greenland
Dim gr As Graphics = picFlag.CreateGraphics
Dim r As Integer = 40
'picFlag.Width = 149, picFlag.Height = 99
gr.FillRectangle(Brushes.White, 0, 0, 149, 49)
gr.FillRectangle(Brushes.Red, 0, 49, 149, 49)
gr.DrawLine(Pens.Black, 0, 0, 148, 0)
'top border
gr.DrawLine(Pens.Black, 0, 0, 0, 98)
'left border
gr.DrawLine(Pens.Black, 0, 98, 148, 98) 'bottom border
gr.DrawLine(Pens.Black, 148, 0, 148, 98) 'right border
gr.FillPie(Brushes.Red, 68 - r, 49 - r, 2 * r, 2 * r, 180, 180)
gr.FillPie(Brushes.White, 68 - r, 49 - r, 2 * r, 2 * r, 0, 180)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 320 of 443)
9. Private Sub btnDraw_Click(...) Handles btnDraw.Click
Dim numbers As String = ""
Dim gr As Graphics = picBox.CreateGraphics
picBox.Refresh()
Dim n As Integer = CInt(txtNumber.Text)
'Font is Microsoft Sans Serif
For i As Integer = 0 To n
If i < 9 Then
numbers &= i & "
"
Else
numbers &= i & "
"
End If
gr.DrawLine(Pens.Blue, 12 + (24 * i), 5, 12 + (24 * i), 15)
Next
gr.DrawLine(Pens.Blue, 0, 10, 24 * (n + 1), 10)
gr.DrawString(numbers, Me.Font, Brushes.Blue, 8, 20)
End Sub
10. Private Sub btnDraw_Click(...) Handles btnDraw.Click
Dim gr As Graphics = picOutput.CreateGraphics
picOutput.Refresh()
For i As Integer = 1 To CInt(mtbNum.Text)
gr.DrawLine(Pens.Red, 5, 25 * i, 100, 25 * i)
gr.DrawString("LINE " & i, Me.Font, Brushes.Red, 110, 25 * i - 5)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 321 of 443)
11. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim legend() As String = {"Soft Drinks", "Beer",
"Bottled Water", "Other"}
Dim quantity() As Decimal = {52.9D, 14.7D, 11.1D, 21.3D}
Dim percent(quantity. Count - 1) As Decimal
Dim sumOfQuantities As Decimal = 0
Dim sumOfSweepAngles As Decimal = 0
Dim br() As Brush = {Brushes.Blue, Brushes.Red, Brushes.Tan,
Brushes.Green, Brushes.Orange, Brushes.Gray}
Dim gr As Graphics = picOutput.CreateGraphics
'The picture box has width 312 and height 215
Dim r As Integer = 100
'Radius of circle
Dim c As Integer = 105
'Center of circle is (c, c)
Me.Text = "U.S. Recreational Beverage Consumption"
'Sum the numbers for the quantities
For i As Integer = 0 To (quantity.Count – 1)
sumOfQuantities += quantity(i)
Next
'Convert tbe quantities to percents
For i As Integer = 0 To (quantity. Count – 1)
percent(i) = quantity(i) / sumOfQuantities
Next
'Display the pie chart and the legends
For i As Integer = 0 To (quantity. Count – 1)
gr.FillPie(br(i), c - r, c - r, 2 * r, 2 * r,
sumOfSweepAngles, percent(i) * 360)
sumOfSweepAngles += percent(i) * 360
gr.FillRectangle(br(i), 220, 20 + 30 * i, 20, 20)
gr.DrawString(legend(i), Me.Font, Brushes.Black, 250, 22 + 30 * i)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 322 of 443)
12. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim quantity() As Decimal = {1, 1.15D, 2.65D, 3.35D, 5.15D, 7.25D}
Dim gr As Graphics = picOutput.CreateGraphics
Dim dates as String
'The picture box has width 210 and height 150
gr.DrawLine(Pens.Black, 40, 170, picOutput.Width - 20, 170) 'Draw x-axis
gr.DrawLine(Pens.Black, 40, 170, 40, 5)
'Draw y-axis
gr.DrawLine(Pens.Black, 35, 170 - (7.25 * 20), 45, 170 - (7.25 * 20)) 'ticks
gr.DrawString("$7.25", Me.Font, Brushes.Black, 1, 20)
Me.Text = "U.S. Minimum Wage"
For i As Integer = 0 To (quantity.Count – 1)
gr.FillRectangle(Brushes.Blue, 60 + i * 50,
(170 - quantity(i) * 20), 20, quantity(i) * 20)
Next
'US minimum wage became $7.25 on July 24, 2009.
dates = "1959
1968
1978
1988
1998
2009"
gr.DrawString(dates, Me.Font, Brushes.Black, 55, 175)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 323 of 443)
13. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim gr As Graphics = picOutput.CreateGraphics
Dim smokers() As Decimal = {7.4D, 6.4D, 5.3D, 4.4D, 3.7D, 2.6D, 1.7D}
gr.DrawLine(Pens.Black, 30, 70, picOutput.Width, 70) 'x-axis
gr.DrawLine(Pens.Black, 30, 70, 30, 0)
'y-axis
gr.DrawLine(Pens.Black, 27, 70 - 7.4 * 7, 33, 70 - 7.4 * 7) 'tick mark
gr.DrawString("7.4", Me.Font, Brushes.Black, 0, 70 - 7.4 * 7 - 6)
gr.DrawString("2002
2004
2006
2008
2010
2012
2014",
Me.Font, Brushes.Black, 35, 78)
gr.DrawString("Percentage of College Freshmen Who Smoke", Me.Font,
Brushes.Blue, 30, 95)
gr.DrawString("Source: Higher Education Research Institute", Me.Font,
Brushes.Blue, 30, 110)
For i As Integer = 0 To smokers.Count - 2
gr.DrawLine(Pens.Blue, 50 + i * 35, 70 - smokers(i) * 7,
50 + (i + 1) * 35, 70 - smokers(i + 1) * 7)
Next
For i As Integer = 0 To smokers.Count - 1
gr.DrawLine(Pens.Black, 50 + i * 35, 75, 50 + i * 35, 65)
gr.FillEllipse(Brushes.Blue, 50 + i * 35 - 3,
70 - smokers(i) * 7 - 3, 6, 6)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 324 of 443)
14. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim males() As Decimal = {1375, 2047, 2233, 2559, 3265}
Dim females() As Decimal = {945, 2479, 3007, 3340, 4415}
Dim gr As Graphics = picBox.CreateGraphics
gr.DrawLine(Pens.Blue, 30, 100, picBox.Width, 100) 'x-axis
gr.DrawLine(Pens.Black, 30, 100, 30, 0)
'y-axis
gr.DrawLine(Pens.Black, 27, 120 - females(4) / 40, 33,
120 - females(4) / 40)
'tick mark
gr.DrawString(CStr(females(4)), Me.Font, Brushes.Blue, 0,
120 - females(4) / 40 - 6)
gr.DrawString("1970
1980
1990
2000
2010", Me.Font,
Brushes.Blue, 35, 102)
gr.DrawString("Two-Year College Enrollments", Me.Font,
Brushes.Blue, 30, 120)
gr.DrawString("(in thousands)", Me.Font, Brushes.Blue, 30, 135)
For i As Integer = 0 To males.Count - 2
gr.DrawLine(Pens.Red, 50 + i * 35, 120 - females(i) / 40,
50 + (i + 1) * 35, 120 - females(i + 1) / 40)
gr.DrawLine(Pens.Green, 50 + i * 35, 120 - males(i) / 40,
50 + (i + 1) * 35, 120 - males(i + 1) / 40)
Next
For i As Integer = 0 To males.Count - 1
gr.FillEllipse(Brushes.Red, 50 + i * 35 - 3,
120 - females(i) / 40 - 3, 6, 6)
gr.FillEllipse(Brushes.Green, 50 + i * 35 - 3,
120 - males(i) / 40 - 3, 6, 6)
Next
gr.DrawString("males", Me.Font, Brushes.Green, 32, 65)
gr.DrawString("females", Me.Font, Brushes.Red, 140, 7)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 325 of 443)
15. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim quantity() As Decimal = {6.9D, 4.6D, 4.4D, 3.5D, 3.1D}
Dim gr As Graphics = picOutput.CreateGraphics
Dim legend As String
'The picture box has width 310 and height 170
gr.DrawLine(Pens.Black, 10, 110, picOutput.Width - 10, 110) 'Draw x-axis
Me.Text = "Most Popular Majors"
For i As Integer = 0 To quantity.Count - 1
gr.FillRectangle(Brushes.Tan, 20 + i * 60,
(110 - quantity(i) * 15), 30, quantity(i) * 15)
gr.DrawString(((quantity(i)).ToString("N1") & "%"),
Me.Font, Brushes.DarkBlue, 21 + i * 60, 95)
Next
legend = "Biology
Psychology
Nursing
Computer
Bus. Admin."
gr.DrawString(legend, Me.Font, Brushes.Blue, 15, 112)
legend = "(general)
Science" &
"
(general)"
gr.DrawString(legend, Me.Font, Brushes.Blue, 12, 124)
'gr.DrawString("Prevet", Me.Font, Brushes.Blue, 195, 128)
gr.DrawString("Most Popular Majors for College Freshmen in Fall 2014",
Me.Font, Brushes.Blue, 5, 145)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 326 of 443)
16. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim wellOff() As Decimal = {59, 74, 73, 77}
Dim meaningfulPhil() As Decimal = {60, 43, 44, 51}
Dim legend() As String = {"Be very well off financially",
"Develop a meaningful philosophy of life"}
Dim gr As Graphics = picOutput.CreateGraphics
'The picture box has width 210 and height 150
gr.DrawLine(Pens.Black, 35, 80, picOutput.Width, 80) 'Draw x-axis
gr.DrawLine(Pens.Black, 35, 80, 35, 0)
'Draw y-axis
gr.DrawLine(Pens.Black, 30, 80 - 74, 40, 80 - 74) 'Draw tick mark
gr.DrawString("74", Me.Font, Brushes.Black, 12, 0)
For i As Integer = 0 To 3
gr.FillRectangle(Brushes.Blue, 55 + i * 60,
(80 - wellOff(i)), 15, wellOff(i))
Next
For i As Integer = 0 To 3
gr.FillRectangle(Brushes.Red, 70 + i * 60,
(80 - meaningfulPhil(i)), 15, meaningfulPhil(i))
Next
gr.DrawString("1978
1988
1998
2008",
Me.Font, Brushes.Black, 55, 82)
gr.DrawString("Freshman Life Goals", Me.Font, Brushes.Black, 55, 95)
gr.DrawString("(% of students committed to goal)", Me.Font,
Brushes.Black, 55, 110)
gr.FillRectangle(Brushes.Blue, 35, 135, 15, 15)
gr.DrawString(legend(0), Me.Font,
Brushes.Black, 53, 135)
gr.FillRectangle(Brushes.Red, 35, 155, 15, 15)
gr.DrawString(legend(1), Me.Font,
Brushes.Black, 53, 155)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 327 of 443)
17. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim legend() As String = {"Bengali", "English", "German", "Hindi",
"Japanese", "Mandarin", "Portuguese", "Russian", "Spanish", "Wu"}
Dim quantity() As Decimal = {183, 335, 78, 260, 122, 848,
203, 167, 414, 72}
Dim gr As Graphics = picOutput.CreateGraphics
Dim caption As String
'The picture box has width 365 and height 185
gr.DrawLine(Pens.Black, 40, 100, picOutput.Width, 100) 'x-axis
gr.DrawLine(Pens.Black, 40, 100, 40, 0)
'y-axis
gr.DrawLine(Pens.Black, 35, 100 - 84.8, 45, 100 - 84.8) 'Tick mark
gr.DrawString("848", Me.Font, Brushes.Black, 8, 100 - 88.2 - 6)
Me.Text = "Principal Languages"
For i As Integer = 0 To quantity.Count - 1
gr.FillRectangle(Brushes.Blue, 60 + i * 30,
(100 - quantity(i) / 10), 15, quantity(i) / 10)
Next
For i As Integer = 0 To quantity.Count - 1 Step 2
gr.DrawLine(Pens.Black, 60 + i * 30 + 7, 100, 60 + i * 30 + 7, 110)
gr.DrawString(legend(i), Me.Font, Brushes.Black, 60 + i * 30 - 21, 110)
Next
For i As Integer = 1 To quantity.Count - 1 Step 2
gr.DrawLine(Pens.Black, 60 + i * 30 + 7, 100, 60 + i * 30 + 7, 130)
gr.DrawString(legend(i), Me.Font, Brushes.Black, 60 + i * 30 - 10, 130)
Next
gr.DrawString("Principal Languages of the World",
Me.Font, Brushes.Blue, 90, 150)
caption = "(in millions of " & Chr(34) & "first language" &
Chr(34) & " speakers)"
gr.DrawString(caption, Me.Font, Brushes.Blue, 90, 165)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 328 of 443)
18. Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim legend() As String = {"Housing", "Transportation", "Food", "Other"}
Dim quantity() As Decimal = {CDec(mtbHousing.Text),
CDec(mtbTransportation.Text),
CDec(mtbFood.Text),CSng(mtbOther.Text)}
Dim percent(quantity.Count - 1) As Decimal
Dim sumOfQuantities As Decimal = 0
Dim sumOfSweepAngles As Decimal = 0
Dim br() As Brush = {Brushes.Blue, Brushes.Red,
Brushes.Green, Brushes.Orange}
Dim gr As Graphics = picOutput.CreateGraphics
'The picture box has width 312 and height 215
Dim r As Integer = 100
'Radius of circle
Dim c As Integer = 105
'Center of circle is (c, c)
'Sum the numbers for the quantities
For i As Integer = 0 To (quantity.Count – 1)
sumOfQuantities += quantity(i)
Next
'Convert tbe quantities to percents
For i As Integer = 0 To (quantity.Count – 1)
percent(i) = quantity(i) / sumOfQuantities
Next
'Display the pie chart and the legends
For i As Integer = 0 To (quantity.Count – 1)
gr.FillPie(br(i), c - r, c - r, 2 * r, 2 * r,
sumOfSweepAngles, percent(i) * 360)
sumOfSweepAngles += percent(i) * 360
gr.FillRectangle(br(i), 220, 20 + 30 * i, 20, 20)
gr.DrawString(legend(i), Me.Font, Brushes.Black, 250, 22 + 30 * i)
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 329 of 443)
19. Dim x As Integer = 1
Dim y As Integer = 40
Private Sub frmPlane_Load(...) Handles MyBase.Load
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(...) Handles Timer1.Tick
If picBox.Left = Me.Width Then
picBox.Left = -picBox.Width
Else
picBox.Left += 1
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 330 of 443)
20. Const ONE_INCH As Integer = 100
Const LINE_HEIGHT As Integer = 20
'number of pixels in an inch
'one quarter of an inch
Private Sub btnPrint_Click(...) Handles btnPrint.Click
PrintDocument1.Print()
End Sub
Private Sub PrintDocument1_PrintPage(sender As System.Object,
e As System.Drawing.Printing.PrintPageEventArgs) Handles _
PrintDocument1.PrintPage
Dim gr As Graphics = e.Graphics
Dim x1 As Integer = ONE_INCH
'use one inch beyond left margin
Dim x2 As Integer = CInt(1.5 * ONE_INCH)
'offset for second column
Dim y As Integer = ONE_INCH
'use one inch top margin
Dim font1 As New Font("Courier New", 10, FontStyle.Bold)
Dim font2 As New Font("Courier New", 10, FontStyle.Regular)
gr.DrawString("PLS", font1, Brushes.Black, x1, y)
gr.DrawString("Please", font2, Brushes.Black, x2, y)
y += LINE_HEIGHT
gr.DrawString("TAFN", font1, Brushes.Black, x1, y)
gr.DrawString("That's all for now", font2, Brushes.Black, x2, y)
y += LINE_HEIGHT
gr.DrawString("HHOK", font1, Brushes.Black, x1, y)
gr.DrawString("Ha, ha - only kidding", font2, Brushes.Black, x2, y)
y += LINE_HEIGHT
gr.DrawString("FWIW", font1, Brushes.Black, x1, y)
gr.DrawString("For what its worth", font2, Brushes.Black, x2, y)
y += LINE_HEIGHT
gr.DrawString("IMHO", font1, Brushes.Black, x1, y)
gr.DrawString("In my humble opinion", font2, Brushes.Black, x2, y)
End Sub
Private Sub btnPreview_Click(...) Handles btnPreview.Click
PrintPreviewDialog1.Document = PrintDocument1
PrintPreviewDialog1.ShowDialog()
End Sub
PLS
TAFN
HHOK
FWIW
IMHO
Please
That’s all for now
Ha, ha - only kidding
For what its worth
In my humble opinion
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 331 of 443)
21. Const ONE_INCH As Integer = 100
Const LINE_HEIGHT As Integer = 20
'number of pixels in an inch
'one quarter of an inch
Private Sub btnPrint_Click(...) Handles btnPrint.Click
PrintDocument1.Print()
End Sub
Private Sub PrintDocument1_PrintPage(sender As System.Object,
e As System.Drawing.Printing.PrintPageEventArgs) Handles _
PrintDocument1.PrintPage
Dim gr As Graphics = e.Graphics
Dim x1 As Integer = ONE_INCH
'use one inch beyond left margin
Dim x2 As Integer = CInt(1.5 * ONE_INCH)
'offset for second column
Dim x3 As Integer = CInt(2.25 * ONE_INCH)
'offset for third column
Dim y As Integer = ONE_INCH
'use one inch top margin
Dim font1 As New Font("Courier New", 10, FontStyle.Underline)
Dim font2 As New Font("Courier New", 10, FontStyle.Regular)
gr.DrawString("% That uses", font2, Brushes.Black, x3, y)
y += LINE_HEIGHT
gr.DrawString("Rank", font1, Brushes.Black, x1, y)
gr.DrawString("Country", font1, Brushes.Black, x2, y)
gr.DrawString("the Internet", font1, Brushes.Black, x3, y)
y += LINE_HEIGHT
gr.DrawString("1", font2, Brushes.Black, x1, y)
gr.DrawString("Norway", font2, Brushes.Black, x2, y)
gr.DrawString((0.950).ToString("P1"), font2, Brushes.Black, x3, y)
y += LINE_HEIGHT
gr.DrawString("2", font2, Brushes.Black, x1, y)
gr.DrawString("USA", font2, Brushes.Black, x2, y)
gr.DrawString((0.842).ToString("P1"), font2, Brushes.Black, x3, y)
y += LINE_HEIGHT
gr.DrawString("3", font2, Brushes.Black, x1, y)
gr.DrawString("China", font2, Brushes.Black, x2, y)
gr.DrawString((0.458).ToString("P1"), font2, Brushes.Black, x3, y)
End Sub
Private Sub btnPreview_Click(...) Handles btnPreview.Click
PrintPreviewDialog1.Document = PrintDocument1
PrintPreviewDialog1.ShowDialog()
End Sub
Rank
1
2
3
Country
Norway
USA
China
% That uses
the Internet
95.0%
84.2%
45.8%
22. Private Sub btnPreview_Click(...) Handles btnPreview.Click
PrintPreviewDialog1.Document = PrintDocument1
PrintPreviewDialog1.ShowDialog()
End Sub
Private Sub btnPrint_Click(...) Handles btnPrint.Click
PrintDocument1.Print()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 332 of 443)
Private Sub PrintDocument1_PrintPage(sender As System.Object,
e As System.Drawing.Printing.PrintPageEventArgs) Handles _
PrintDocument1.PrintPage
Dim legend() As String = {"Federal", "State", "Local"}
Dim quantity() As Decimal = {33, 207, 180}
Dim percent(quantity.Count - 1) As Decimal
Dim sumOfQuantities As Decimal = 0
Dim sumOfSweepAngles As Decimal = 0
Dim br() As Brush = {Brushes.Blue, Brushes.Red, Brushes.Tan,
Brushes.Green, Brushes.Orange, Brushes.Gray}
Dim gr As Graphics = e.Graphics
Dim r As Integer = 100
'Radius of circle
Dim cx As Integer = 405
'Center of circle is (cx, cy)
Dim cy As Integer = 305
gr.DrawString("Financing for Public Schools (K - 12)", Me.Font,
Brushes.Black, 300, 175)
For i As Integer = 0 To (quantity.Count – 1)
sumOfQuantities += quantity(i)
Next
'Convert tbe quantities to percents
For i As Integer = 0 To (quantity.Count – 1)
percent(i) = quantity(i) / sumOfQuantities
Next
'Print the pie chart and the legends
For i As Integer = 0 To (quantity.Count – 1)
gr.FillPie(br(i), cx - r, cy - r, 2 * r, 2 * r,
sumOfSweepAngles, percent(i) * 360)
sumOfSweepAngles += percent(i) * 360
gr.FillRectangle(br(i), 520, 220 + 30 * i, 20, 20)
gr.DrawString(legend(i), Me.Font, Brushes.Black, 550, 222 + 30 * i)
Next
End Sub
23. Private Sub btnPrint_Click(...) Handles btnPrint.Click
PrintDocument1.Print()
End Sub
Private Sub PrintDocument1_PrintPage(sender As System.Object,
e As System.Drawing.Printing.PrintPageEventArgs) Handles _
PrintDocument1.PrintPage
'Print Italian flag
Dim gr As Graphics = e.Graphics
Dim br() As Brush = {Brushes.Green, Brushes.White, Brushes.Red}
For i As Integer = 0 To 2
gr.FillRectangle(br(i), 300 + i * 50, 200, 50, 99)
Next
gr.DrawLine(Pens.Black, 300, 200, 448, 200) 'top border
gr.DrawLine(Pens.Black, 300, 200, 300, 298) 'left border
gr.DrawLine(Pens.Black, 300, 298, 448, 298) 'bottom border
gr.DrawLine(Pens.Black, 448, 200, 448, 298) 'right border
End Sub
Private Sub btnPreview_Click(...) Handles btnPreview.Click
PrintPreviewDialog1.Document = PrintDocument1
PrintPreviewDialog1.ShowDialog()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 333 of 443)
24. Private Sub btnPrint_Click(...) Handles btnPrint.Click
PrintDocument1.Print()
End Sub
Private Sub PrintDocument1_PrintPage(sender As System.Object,
e As System.Drawing.Printing.PrintPageEventArgs) Handles _
PrintDocument1.PrintPage
Dim gr As Graphics = e.Graphics
Dim br() As Brush = {Brushes.Orange, Brushes.White, Brushes.Green}
Dim r As Integer = 12
'radius of circle
'picFlag.Width = 99, picFlag.Height = 149
For i As Integer = 0 To 2
gr.FillRectangle(br(i), 300, 200 + i * 33, 149, 33)
Next
gr.FillPie(Brushes.Orange, 375 - r, 249 - r, 2 * r, 2 * r, 0, 360)
gr.DrawLine(Pens.Black, 300, 200, 448, 200)
'top border
gr.DrawLine(Pens.Black, 300, 200, 300, 298)
'left border
gr.DrawLine(Pens.Black, 300, 298, 348, 298)
'bottom border
gr.DrawLine(Pens.Black, 448, 200, 448, 298)
'right border
End Sub
Private Sub btnPreview_Click(...) Handles btnPreview.Click
PrintPreviewDialog1.Document = PrintDocument1
PrintPreviewDialog1.ShowDialog()
End Sub
CHAPTER 9 PROGRAMMING PROJECTS
1. Const FILE_NAME As String = "MemberPhones.txt"
Dim membs() As String = IO.File.ReadAllLines(FILE_NAME)
Private Sub frmMembers_Load(...) Handles MyBase.Load
DisplayList()
End Sub
Sub DisplayList()
lstMembers.Items.Clear()
Dim query = From member In membs
Let data = member.Split(","c)
Select data(0)
For Each person In query
lstMembers.Items.Add(person)
Next
End Sub
Private Sub lstMembers_SelectedIndexChanged(...) Handles _
lstMembers.SelectedIndexChanged
'Display the structure's data corresponding to the selected item.
Dim i As Integer = lstMembers.SelectedIndex
Dim data() = membs(i).Split(","c)
If i >= 0 Then
txtName.Text = data(0)
mtbPhone.Text = data(1)
Else
txtName.Clear()
mtbPhone.Clear()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 334 of 443)
Private Sub mnuUpdateModify_Click(...) Handles mnuUpdateModify.Click
'Store the modifications.
Dim i As Integer = lstMembers.SelectedIndex
If i >= 0 Then
membs(i) = txtName.Text & "," & mtbPhone.Text
End If
'Sort list of names
Dim query = From member In membs
Let data = member.Split(","c)
Let names = data(0).Split(" "c)
Order By names(1), names(0)
Select member
membs = query.ToArray
DisplayList()
End Sub
Private Sub mnuUpdateAdd_Click(...) Handles mnuUpdateAdd.Click
'Add a new member.
Dim n = membs.Count
ReDim Preserve membs(n)
membs(n) = txtName.Text & "," & mtbPhone.Text
Dim query = From member In membs
Let data = member.Split(","c)
Let names = data(0).Split(" "c)
Order By names(1), names(0)
Select member
membs = query.ToArray
DisplayList()
End Sub
Private Sub mnuUpdateDelete_Click(...) Handles mnuUpdateDelete.Click
'Delete a member.
Dim i As Integer = lstMembers.SelectedIndex
If i >= 0 Then
'Only delete the entry if one is selected.
Dim query = From member In membs
Where member.Split(","c)(0) <> txtName.Text
Select member
membs = query.ToArray
DisplayList()
End If
End Sub
Private Sub mnuExit_Click(...) Handles mnuExit.Click
'Store the membership information into the file and end the program.
IO.File.WriteAllLines(FILE_NAME, membs)
Me.Close()
'Terminate the program
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 335 of 443)
2. Dim votes(0) As Integer
'Dimension a small array of length 1.
Private Sub btnCandidate_Click(...) Handles btnCandidate.Click
'Nominate a candidate by adding him or her to the list.
Dim name As String
'Clear the existing votes and results
lstVotes.Visible = False
lstVotes.Items.Clear()
txtVotes.Clear()
'Get the name of the candidate
name = InputBox("Enter the candidate's name:", "Nominate")
'If the name is not already in the list, then add it
If lstCandidate.Items.IndexOf(name) = -1 Then
lstCandidate.Items.Add(name)
End If
End Sub
Private Sub btnStartVoting_Click(...) Handles btnStartVoting.Click
btnCandidate.Enabled = False
lblInstructions.Text = "Vote for a candidate by" &
" double-clicking on his/her name. " &
"End the voting by clicking on 'Tally Votes'."
End Sub
Private Sub lstCandidate_DoubleClick(...) Handles lstCandidate.DoubleClick
'Vote for a candidate by incrementing the candidate's count
If votes.Count <= 1 Then
'Resize the votes array if not done so already
ReDim votes(lstCandidate.Items.Count)
End If
votes(lstCandidate.SelectedIndex) += 1
txtVotes.Clear()
'Clear the results
lstVotes.Visible = False
MessageBox.Show("You voted for " & lstCandidate.Text & ".", "VOTE RECORDED")
End Sub
Private Sub btnTallyVotes_Click(...) Handles btnTallyVotes.Click
'Count the results and display the winner
Dim winner As Integer
Dim count As String
lblInstructions.Text = ""
lstVotes.Visible = True
lstVotes.Items.Clear()
winner = 0
'Index of the candidate with the most votes
For i As Integer
=
0 To (lstCandidate.Items.Count – 1)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 336 of 443)
Select Case votes(i)
Case 0
count = "No votes"
Case 1
count = "One vote"
Case Else
count = CStr(votes(i)) & " votes"
End Select
lstVotes.Items.Add(count)
'Display the votes for the candidate.
If votes(i) > votes(winner) Then
winner = i
'Remember who has the most votes.
End If
Next
txtVotes.Clear()
'Display the candidate(s) with the most votes
For i As Integer = 0 To (lstCandidate.Items.Count – 1)
If votes(i) = votes(winner) Then
If txtVotes.Text.Length = 0 Then 'The first winning candidate
txtVotes.Text = CStr(lstCandidate.Items(i))
Else
'Multiple candidates with the winning vote count
txtVotes.Text = txtVotes.Text & " and " & CStr(lstCandidate.Items(i))
End If
End If
Next
'Display the winning vote count
txtVotes.Text = txtVotes.Text & " wins with " & votes(winner) & " votes."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 337 of 443)
3. 'frmBooks' code
Structure Book
Dim title As String
Dim author As String
Dim category As String
Dim stock As Integer
Dim price As Decimal
End Structure
'Title
'Author's name
'True = fiction, False = nonfiction
'Quantity in stock
'Wholesale price
Public books() As Book
Public numBooks As Integer
'number of books carried
Public flagNewBook As Boolean = False
Public n As Integer
'current index
Private Sub frmBooks_Load(...) Handles MyBase.Load
'Load the data file into the array and display all books
If IO.File.Exists("Books.txt") Then
Dim tomes() As String = IO.File.ReadAllLines("Books.txt")
numBooks = tomes.Count
ReDim books(numBooks - 1)
Dim data(4) As String
For i As Integer = 0 To (numBooks – 1)
data = tomes(i).Split(","c)
books(i).title = data(0)
books(i).author = data(1)
books(i).category = data(2)
books(i).stock = CInt(data(3))
books(i).price = CDec(data(4))
Next
Dim query = From book In tomes
Let line = book.Split(","c)
Let title = line(0)
Select title
lstBooks.DataSource = query.ToList
lstBooks.SelectedItem = Nothing
End If
End Sub
Private Sub mnuDisplayAll_Click(...) Handles mnuDisplayAll.Click
'Display books
mnuDisplayAll.Checked = True
mnuDisplayFiction.Checked = False
mnuDisplayNonfiction.Checked = False
Display()
End Sub
Private Sub mnuDisplayFiction_Click(...) Handles mnuDisplayFiction.Click
'Display books
mnuDisplayAll.Checked = False
mnuDisplayFiction.Checked = True
mnuDisplayNonfiction.Checked = False
Display()
End Sub
Private Sub mnuDisplayNonfiction_Click(...) Handles mnuDisplayNonfiction.Click
'Display books
mnuDisplayAll.Checked = False
mnuDisplayFiction.Checked = False
mnuDisplayNonfiction.Checked = True
Display()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 338 of 443)
Sub Display()
'Display appropriate subset of books
Dim query = From book In books
Where (book.category = "F" And
(Not mnuDisplayNonfiction.Checked)) Or
(book.category = "N" And (Not mnuDisplayFiction.Checked))
Select book.title
lstBooks.DataSource = query.ToList
lstBooks.SelectedItem = Nothing
End Sub
Private Sub mnuBookAdd_Click(...) Handles mnuBookAdd.Click
'Add a new book to the array
flagNewBook = True
frmDetails.txtTitle.Clear()
frmDetails.txtAuthor.Clear()
frmDetails.txtStock.Clear()
frmDetails.txtPrice.Clear()
frmDetails.radFiction.Checked = True
frmDetails.ShowDialog()
End Sub
Private Sub mnuBookDelete_Click(...) Handles mnuBookDelete.Click
'Delete the selected book from the array
n = lstBooks.SelectedIndex
If n >= 0 Then
'Only delete if book is selected
numBooks = numBooks - 1
For j As Integer = n To (numBooks – 1)
'Shift the items above down by one
books(j) = books(j + 1)
Next
ReDim Preserve books(numBooks - 1)
Display()
'Redisplay the output
End If
End Sub
Private Sub mnuBookUpdate_Click(...) Handles mnuBookUpdate.Click
'Update the stock or price of the selected book
n = lstBooks.SelectedIndex
If n >= 0 Then
'Only update if book is selected
flagNewBook = False
frmDetails.txtTitle.Text = books(n).title
frmDetails.txtTitle.SelectionStart = 0
frmDetails.txtAuthor.Text = books(n).author
frmDetails.txtStock.Text = CStr(books(n).stock)
frmDetails.txtPrice.Text = (books(n).price).ToString("C")
If books(n).category = "F" Then
frmDetails.radFiction.Checked = True
Else
frmDetails.radNonFiction.Checked = True
End If
frmDetails.ShowDialog()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 339 of 443)
Private Sub mnuFileSave_Click(...) Handles mnuFileSave.Click
'Save the array into the text file
Dim query = From book In books
Let line = book.title & "," & book.author & "," &
book.category & "," & book.stock & "," & book.price
Select line
IO.File.WriteAllLines("Books.txt", query)
MessageBox.Show("File saved.")
End Sub
Private Sub mnuFileExit_Click(...) Handles mnuFileExit.Click
'End the program
End
End Sub
Private Sub mnuValuesAll_Click(...) Handles mnuValuesAll.Click
Dim query = From book In books
Select book.price * book.stock
MessageBox.Show("Value: " & (query.Sum).ToString("C"), "All")
End Sub
Private Sub mnuValuesFiction_Click(...) Handles mnuValuesFiction.Click
Dim query = From book In books
Where book.category = "F"
Select book.price * book.stock
MessageBox.Show("Value: " & (query.Sum).ToString("C"), "Fiction")
End Sub
Private Sub mnuValuesNonfiction_Click(...) Handles mnuValuesNonfiction.Click
Dim query = From book In books
Where book.category = "N"
Select book.price * book.stock
MessageBox.Show("Value: " & (query.Sum).ToString("C"), "Nonfiction")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 340 of 443)
'frmDetails' code
Private Sub btnRecord_Click(...) Handles btnRecord.Click
If (txtTitle.Text = "") Or (txtAuthor.Text = "") Or _
(txtStock.Text = "") Or (txtPrice.Text = "") Then
MessageBox.Show("You must enter the title, author, stock and price.")
Else
If frmBooks.flagNewBook Then
ReDim Preserve frmBooks.books(frmBooks.numBooks)
frmBooks.books(frmBooks.numBooks).title = txtTitle.Text
frmBooks.books(frmBooks.numBooks).author = txtAuthor.Text
frmBooks.books(frmBooks.numBooks).stock = CInt(txtStock.Text)
frmBooks.books(frmBooks.numBooks).price = CDec(txtPrice.Text)
If radFiction.Checked Then
frmBooks.books(frmBooks.numBooks).category = "F"
Else
frmBooks.books(frmBooks.numBooks).category = "N"
End If
frmBooks.numBooks += 1
Else
frmBooks.books(frmBooks.n).title = txtTitle.Text
frmBooks.books(frmBooks.n).author = txtAuthor.Text
frmBooks.books(frmBooks.n).stock = CInt(txtStock.Text)
frmBooks.books(frmBooks.n).price = CDec(txtPrice.Text)
If radFiction.Checked Then
frmBooks.books(frmBooks.n).category = "F"
Else
frmBooks.books(frmBooks.n).category = "N"
End If
End If
End If
Me.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 341 of 443)
4. 'frmChart's code
Dim seats(15, 6) As String
'15 rows of six seats per row
'
Each may have value R, L, V or . (period)
Dim frmAssign As New frmMeal() 'Form to use to assign a seat
Private Sub frmChart_Load(...) Handles MyBase.Load
'Initialize the display and data array.
'Add heading to list box
lstRows.Items.Add(" ABC DEF ")
For i As Integer = 1 To 15
'Loop over each row.
For j As Integer = 1 To 6
'Initialize each seat to empty.
seats(i, j) = "."
Next
'Initialize the display row.
lstRows.Items.Add(" ... ... ")
Next
End Sub
Private Sub lstRows_SelectedIndexChanged(...) Handles _
lstRows.SelectedIndexChanged
'Display the details of the selected row in the text boxes.
Dim row As Integer = lstRows.SelectedIndex
If row > 0 Then
ShowRow(row)
End If
End Sub
Private Sub ShowRow(row As Integer)
'Update the row's information in the text boxes.
txtRow.Text = CStr(row)
txtA.Text = seats(row, 1)
txtB.Text = seats(row, 2)
txtC.Text = seats(row, 3)
txtD.Text = seats(row, 4)
txtE.Text = seats(row, 5)
txtF.Text = seats(row, 6)
End Sub
Private Sub txtA_Click(...) Handles txtA.Click
Assign(1)
End Sub
Private Sub txtB_Click(...) Handles txtB.Click
Assign(2)
End Sub
Private Sub txtC_Click(...) Handles txtC.Click
Assign(3)
End Sub
Private Sub txtD_Click(...) Handles txtD.Click
Assign(4)
End Sub
Private Sub txtE_Click(...) Handles txtE.Click
Assign(5)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 342 of 443)
Private Sub txtF_Click(...) Handles txtF.Click
Assign(6)
End Sub
Sub Assign(seat As Integer)
'Assign the seat in the current row
Dim row As Integer = lstRows.SelectedIndex
'Only assign the seat if the row selected is valid
If row > 0 Then
'Display a secondary form to get value for a seat in a row.
frmAssign.seat = seats(row, seat) 'Assign seat's data to the second form.
frmAssign.Text = "Assign seat " & row & Chr(64 + seat)
frmAssign.ShowDialog() 'Display form, and wait until it is closed.
seats(row, seat) = frmAssign.seat 'Retrieve the new data from the form.
ShowRow(row) 'Update the row's data in the text boxes and list box.
lstRows.Items(row) = " " & seats(row, 1) & seats(row, 2) & seats(row, 3) &
" " & seats(row, 4) & seats(row, 5) & seats(row, 6) & " "
'Clear the statistics window
lstDisplay.Items.Clear()
End If
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display statistics on meal totals, filled and vacant window seats
Dim meals(3) As Integer
Dim vacant As Integer = 0
Dim window As Integer = 0
For row As Integer = 1 To 15
'Compile the statistics.
For seat As Integer = 1 To 6
Select Case seats(row, seat)
Case "R"
meals(1) += 1
Case "L"
meals(2) += 1
Case "V"
meals(3) += 1
Case Else
'If none of the above, then seat is unoccupied.
vacant += 1
If (seat = 1) Or (seat = 6) Then
window += 1
'If it is a window, count it.
End If
End Select
Next
Next
lstDisplay.Items.Clear()
'Display the results
lstDisplay.Items.Add("Seats filled: " & (15 * 6 - vacant))
lstDisplay.Items.Add("Windows avail: " & window)
lstDisplay.Items.Add("Regular meals: " & meals(1))
lstDisplay.Items.Add("LowCal meals: " & meals(2))
lstDisplay.Items.Add("Vegie meals:
" & meals(3))
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 343 of 443)
'frmMeal's code
Public seat As String
'
'seat has values R, L, V or . (period)
In frmChart it is referred to as frmAssign.seat.
Private Sub frmMeal_Load(...) Handles MyBase.Load
'Update the checked status per the seat
Select Case seat
Case "R"
radRegular.Checked = True
Case "L"
radLowCal.Checked = True
Case "V"
radVeg.Checked = True
Case Else
'If none of the above, then seat is unoccupied
radUnoccupied.Checked = True
End Select
End Sub
Private Sub radUnoccupied_CheckedChanged(...) Handles _
radUnoccupied.CheckedChanged
'Set value to seat and close the form
seat = "."
Me.Close()
End Sub
Private Sub radRegular_CheckedChanged(...) Handles radRegular.CheckedChanged
'Set value to seat and close the form
seat = "R"
Me.Close()
End Sub
Private Sub radLowCal_CheckedChanged(...) Handles radLowCal.CheckedChanged
'Set value to seat and close the form
seat = "L"
Me.Close()
End Sub
Private Sub radVeg_CheckedChanged(...) Handles radVeg.CheckedChanged
'Set value to seat and close the form
seat = "V"
Me.Close()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 344 of 443)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 345 of 443)
5. Dim randomNum As New Random
Private Sub frmWorldSeries_Load(...) Handles MyBase.Load
ResetControls()
End Sub
Private Sub btnSimulate_Click(...) Handles btnSimulate.Click
Dim games As Integer
Dim winner As String = ""
'Simulate the playing of 10,000 world series. Update the values of the scroll
'bars and text boxes to reflect the current statistics
ResetControls()
For i As Integer = 1 To 10000
PlaySeries(winner, games)
If winner = "Weaker team won" Then
hsbUnderdog.Value = hsbUnderdog.Value + 1
Else
hsbFavorite.Value = hsbFavorite.Value + 1
End If
Select Case games
Case 4
hsbFour.Value += 1
Case 5
hsbFive.Value += 1
Case 6
hsbSix.Value += 1
Case 7
hsbSeven.Value += 1
End Select
'Force a refresh every 10th time, so that the computer is not too
'overwhelmed with refreshes
If i Mod 10 = 0 Then
UpdateLabels(i)
txtUnderdog.Refresh()
txtFavorite.Refresh()
txtFour.Refresh()
txtFive.Refresh()
txtSix.Refresh()
txtSeven.Refresh()
End If
Next
txtAverageDuration.Text = ((4 * CDbl(hsbFour.Value) +
5 * CSng(hsbFive.Value) + 6 * CSng(hsbSix.Value) +
7 * CSng(hsbSeven.Value)) / 10000).ToString("N") & " games"
End Sub
Private Sub PlaySeries(ByRef winner As String, ByRef games As Integer)
Dim weakerTeamWins As Integer = 0
Dim strongerTeamWins As Integer = 0
Dim numGames As Integer = 0
Dim prob As Integer = CInt(txtProb.Text)
Dim seriesOver As Boolean = False
Do While seriesOver = False
If randomNum.Next(0, 100) < prob Then
weakerTeamWins += 1
Else
strongerTeamWins += 1
End If
If weakerTeamWins = 4 Then
winner = "Weaker team won"
seriesOver = True
ElseIf strongerTeamWins = 4 Then
winner = "Stronger team won"
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 346 of 443)
seriesOver = True
End If
numGames += 1
Loop
games = numGames
End Sub
Private Sub ResetControls()
'Resets the initial value of all scroll bars and statistic labels
hsbFavorite.Value = 0
hsbUnderdog.Value = 0
hsbFour.Value = 0
hsbFive.Value = 0
hsbSix.Value = 0
hsbSeven.Value = 0
UpdateLabels(1) 'reuse procedure to set all percentages to zero
txtAverageDuration.Clear()
End Sub
Private Sub UpdateLabels(ByRef numGames As Integer)
txtUnderdog.Text = CStr(hsbUnderdog.Value)
txtFavorite.Text = CStr(hsbFavorite.Value)
txtFour.Text = CStr(hsbFour.Value)
txtFive.Text = CStr(hsbFive.Value)
txtSix.Text = CStr(hsbSix.Value)
txtSeven.Text = CStr(hsbSeven.Value)
txtUnderdogPercent.Text = (CInt(txtUnderdog.Text) / numGames).ToString("P")
txtFavoritePercent.Text = (CInt(txtFavorite.Text) / numGames).ToString("P")
txtFourPercent.Text = (hsbFour.Value / numGames).ToString("P")
txtFivePercent.Text = (hsbFive.Value / numGames).ToString("P")
txtSixPercent.Text = (hsbSix.Value / numGames).ToString("P")
txtSevenPercent.Text = (hsbSeven.Value / numGames).ToString("P")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 347 of 443)
6. Const ONE_INCH As Integer = 75
'number of pixels in an inch
Const LINE_HEIGHT As Integer = 15 'one-quarter of an inch
Private Sub btnPrint_Click(sender As System.Object,
e As System.EventArgs) Handles btnPrint.Click
'Print a Business Travel Expense attachment
PrintDocument1.Print()
End Sub
Private Sub btnPreview_Click(sender As System.Object,
e As System.EventArgs) Handles btnPreview.Click
PrintPreviewDialog1.Document = PrintDocument1
PrintPreviewDialog1.ShowDialog()
End Sub
Private Sub PrintDocument1_PrintPage(sender As System.Object,
e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
Dim gr As Graphics = e.Graphics
Dim str As String
Dim x1 As Integer = ONE_INCH
'use one inch left margin
Dim x2 As Integer = 5 * ONE_INCH
Dim y As Integer = 2 * ONE_INCH 'use two inch top margin
Dim font As New Font("Courier New", 10, FontStyle.Bold)
str = "Business Travel Expenses"
gr.DrawString(str, font, Brushes.Black, x1, y)
font = New Font("Courier New", 10, FontStyle.Regular)
y += 2 * LINE_HEIGHT
'double space
str = "Trip to attend meeting of"
gr.DrawString(str, font, Brushes.Black, x1, y)
y += LINE_HEIGHT
gr.DrawString(txtOrg.Text, font, Brushes.Black, x1, y)
y += LINE_HEIGHT
str = txtDates.Text & " in " & txtPlace.Text
gr.DrawString(str, font, Brushes.Black, x1, y)
y += 2 * LINE_HEIGHT
str = "Meals and entertainment:" & "
" & (CDec(txtMealsEnt.Text)).ToString("C")
gr.DrawString(lblMealsEnt.Text, font, Brushes.Black, x1, y)
gr.DrawString((CDec(txtMealsEnt.Text)).ToString("C"), font, Brushes.Black, x2, y)
y += LINE_HEIGHT
str = "Airplane fare:" & "
" & (CDec(txtAirFare.Text)).ToString("C")
gr.DrawString(lblAirfare.Text, font, Brushes.Black, x1, y)
gr.DrawString((CDec(txtAirFare.Text)).ToString("C"), font, Brushes.Black, x2, y)
y += LINE_HEIGHT
str = "Lodging:" & "
" & (CDec(txtLodging.Text)).ToString("C")
gr.DrawString(lblLodging.Text, font, Brushes.Black, x1, y)
gr.DrawString((CDec(txtLodging.Text)).ToString("C"), font, Brushes.Black, x2, y)
y += LINE_HEIGHT
str = "Taxi fares:" & "
" & (CDec(txtTaxi.Text)).ToString("C")
gr.DrawString(lblTaxi.Text, font, Brushes.Black, x1, y)
gr.DrawString((CDec(txtTaxi.Text)).ToString("C"), font, Brushes.Black, x2, y)
y += 2 * LINE_HEIGHT
Dim other As Decimal = CDec(txtAirFare.Text) + CDec(txtLodging.Text) +
CDec(txtTaxi.Text)
str = "Total other than meals and entertainment: " & other.ToString("C")
gr.DrawString(str, font, Brushes.Black, x1, y)
y += LINE_HEIGHT
Dim mealEntDeduction As Decimal = 0.5D * CDec(txtMealsEnt.Text)
str = "50% of meals and entertainment: " & (CDec(mealEntDeduction)).ToString("C")
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 348 of 443)
gr.DrawString(str, font, Brushes.Black, x1, y)
y += 2 * LINE_HEIGHT
str = "TOTAL DEDUCTIBLE EXPENSES: " & (CDec(other + mealEntDeduction)).ToString("C")
gr.DrawString(str, font, Brushes.Black, x1, y)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 349 of 443)
7. Dim StandardDeckOfCards(51) As String
Dim randomNum As New Random
Private Sub Form1_Load(...) Handles MyBase.Load
'Populate deck of cards
Dim suits() As String = {"Hearts", "Diamonds", "Clubs", "Spades"}
For i As Integer = 0 To 3
'Populate numbers 2 through 10.
For j As Integer = 2 To 10
StandardDeckOfCards(i * 13 + j) = j & " of " & suits(i)
Next
'Populate the honors cards.
StandardDeckOfCards(i * 13 + 0) = "King of " & suits(i)
StandardDeckOfCards(i * 13 + 1) = "Ace of " & suits(i)
StandardDeckOfCards(i * 13 + 11) = "Jack of " & suits(i)
StandardDeckOfCards(i * 13 + 12) = "Queen of " & suits(i)
Next
End Sub
Function ShuffleCards(deckOfCards As String()) As String()
'inside-out algorithm
Dim a(51) As String, k As Integer
a(0) = deckOfCards(0)
For i As Integer = 1 To 51
k = randomNum.Next(0, i + 1)
a(i) = a(k)
a(k) = deckOfCards(i)
Next
Return a
End Function
Private Sub btnCarryOut_Click(...) Handles btnCarryOut.Click
Dim total As Integer
For j As Integer = 1 To 1000000
Dim deck1(51), deck2(51), shuffledDeck1(51),
shuffledDeck2(51) As String
Dim count As Integer = 0
For i As Integer = 0 To 51
deck1(i) = StandardDeckOfCards(i)
deck2(i) = StandardDeckOfCards(i)
Next
shuffledDeck1 = ShuffleCards(deck1)
shuffledDeck2 = ShuffleCards(deck2)
For i As Integer = 0 To 51
If shuffledDeck1(i) = shuffledDeck2(i) Then
count += 1
End If
Next
total += count
Next
txtNumberOfMatches.Text = CStr(total / 1000000)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 350 of 443)
8. Structure Country
Dim name As String
Dim alreadyShown As Boolean
End Structure
Dim flags() As String = IO.File.ReadAllLines("flagCountries.txt")
'flags() is used to count the number of flags and to populate the list box
Dim countries(flags.Length) As Country
'primary array for program
Dim n As Integer
Dim count As Integer = 0 'number of flags shown
Dim randomNum As New Random
Private Sub frmFlags_Load(...) Handles MyBase.Load
For i As Integer = 0 To (flags.Length – 1)
countries(i).name = flags(i)
countries(i).alreadyShown = False
Next
n = CInt(randomNum.Next(0, flags.Length))
picFlag.Image = Image.FromFile("flag" & flags(n) & ".jpg")
countries(n).alreadyShown = True
count += 1
lstCountries.DataSource = flags
lstCountries.SelectedIndex = -1
End Sub
Private Sub lstCountries_Click(...) Handles lstCountries.Click
If lstCountries.SelectedIndex = n Then
MessageBox.Show("Correct")
Else
MessageBox.Show("Not Correct")
End If
lstCountries.SelectedIndex = -1
End Sub
Private Sub btnDisplayFlag_Click(...) Handles btnDisplayFlag.Click
If count < flags.Length Then
Dim found As Boolean = False
Do Until found
n = CInt(randomNum.Next(0, flags.Length))
If countries(n).alreadyShown = False Then
found = True
End If
countries(n).alreadyShown = True
Loop
picFlag.Image = Image.FromFile("flag" & flags(n) & ".jpg")
count += 1
Else
MessageBox.Show("All flags shown.")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 351 of 443)
CHAPTER 10
EXERCISES 10.1
1. (e)
2. (c)
3. (d)
4. (f)
5. (b)
6. (a)
7. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From city In MegacitiesDataSet.Cities
Let popGrowth = (city.pop2015 - city.pop2010) / city.pop2010
Let formattedPopGrowth = popGrowth.ToString("P")
Order By popGrowth Descending
Select city.name, city.country, formattedPopGrowth
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "City"
dgvOutput.Columns("country").HeaderText = "Country"
dgvOutput.Columns("formattedPopGrowth").HeaderText =
"Projected Population Growth"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 352 of 443)
8. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CountriesTableAdapter.Fill(Me.MegacitiesDataSet.Countries)
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From city In MegacitiesDataSet.Cities
Join country In MegacitiesDataSet.Countries
On city.country Equals country.name
Let cityPer = city.pop2010 / country.pop2010
Order By cityPer Descending
Let formattedCityPer = cityPer.ToString("P")
Select city.name, city.country, formattedCityPer
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "City"
dgvOutput.Columns("country").HeaderText = "Country"
dgvOutput.Columns("formattedCityPer").HeaderText =
"Percentage of Country's Population"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 353 of 443)
9. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From city In MegacitiesDataSet.Cities
Where city.pop2015 > 20
Order By city.pop2015 Descending
Select city.name
lstOutput.DataSource = query.ToList
lstOutput.SelectedItem = Nothing
End Sub
10. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
Dim query = From city In MegacitiesDataSet.Cities
Order By city.country
Select city.country
Distinct
lstCountries.DataSource = query.ToList
End Sub
Private Sub lstCountries_SelectedIndexChanged(...) Handles _
lstCountries.SelectedIndexChanged
Dim query = From city In MegacitiesDataSet.Cities
Where city.country = lstCountries.Text
Order By city.pop2010 Descending
Select city.name
txtMostPopulousCity.Text = query.First
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 354 of 443)
11. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query1 = From city In MegacitiesDataSet.Cities
Let perIncr = (city.pop2015 - city.pop2010) / city.pop2010
Order By perIncr Descending
Select city.name
Dim geatestCity As String = query1.First
Dim query2 = From city In MegacitiesDataSet.Cities
Where city.name = geatestCity
Select city.name, city.country, city.pop2010, city.pop2015
dgvOutput.DataSource = query2.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "City"
dgvOutput.Columns("country").HeaderText = "Country"
dgvOutput.Columns("pop2010").HeaderText = "Population in 2010"
dgvOutput.Columns("pop2015").HeaderText = "Population in 2015"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 355 of 443)
12. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From city In MegacitiesDataSet.Cities
Where (city.pop2010 >= 13) And (city.pop2010 <= 19)
Order By city.country
Select city.name, city.country, city.pop2010
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "City"
dgvOutput.Columns("country").HeaderText = "Country"
dgvOutput.Columns("pop2010").HeaderText = "Population in 2010"
End Sub
13. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CountriesTableAdapter.Fill(Me.MegacitiesDataSet.Countries)
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
Dim query = From city In MegacitiesDataSet.Cities
Select city.name
lstCities.DataSource = query.ToList
End Sub
Private Sub lstCities_SelectedIndexChanged(...) Handles _
lstCities.SelectedIndexChanged
Dim query = From city In MegacitiesDataSet.Cities
Join country In MegacitiesDataSet.Countries
On city.country Equals country.name
Let cityPer = city.pop2010 / country.pop2010
Where city.name = lstCities.Text
Select cityPer
txtOutput.Text = (query.First).ToString("P")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 356 of 443)
14. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CountriesTableAdapter.Fill(Me.MegacitiesDataSet.Countries)
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
Dim query = From city In MegacitiesDataSet.Cities
Select city.name
lstCities.DataSource = query.ToList
End Sub
Private Sub lstCities_SelectedIndexChanged(...) Handles _
lstCities.SelectedIndexChanged
Dim query = From city In MegacitiesDataSet.Cities
Join country In MegacitiesDataSet.Countries
On city.country Equals country.name
Where city.name = lstCities.Text
Select country.monetaryUnit
txtOutput.Text = query.First
End Sub
15. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim query = From city In MegacitiesDataSet.Cities
Select city.name & "," & city.country & "," &
city.pop2010 & "," & city.pop2015
IO.File.WriteAllLines("Megacities.txt", query.ToArray)
MessageBox.Show("File Created")
End Sub
16. Private Sub frmCities_Load(...) Handles MyBase.Load
Me.CitiesTableAdapter.Fill(Me.MegacitiesDataSet.Cities)
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 357 of 443)
Private Sub btnCreate_Click(...) Handles btnCreate.Click
Dim sw As IO.StreamWriter = IO.File.CreateText("Megacities.xml")
sw.WriteLine("<?xml version='1.0'?>")
sw.WriteLine("<!-- This file contains data on large cities -->")
sw.WriteLine("<Megacities>")
Dim query = From city In MegacitiesDataSet.Cities
Select city.name, city.country, city.pop2010, city.pop2015
For Each city In query
sw.WriteLine(" <city>")
sw.WriteLine("
<name>" & city.name & "</name>")
sw.WriteLine("
<country>" & city.country & "</country>")
sw.WriteLine("
<pop2010>" & city.pop2010 & "</pop2010>")
sw.WriteLine("
<pop2015>" & city.pop2015 & "</pop2015>")
sw.WriteLine(" </city>")
Next
sw.WriteLine("</Megacities>")
sw.Close()
MessageBox.Show("File Created")
End Sub
17. Private Sub frmNations_Load(...) Handles MyBase.Load
Me.NationsTableAdapter.Fill(Me.UNDataSet.Nations)
Dim query = From nation In UNDataSet.Nations
Order By nation.continent Ascending
Select nation.continent
Distinct
lstContinents.DataSource = query.ToList
End Sub
Private Sub lstContinents_SelectedIndexChanged(...) Handles _
lstContinents.SelectedIndexChanged
Dim queryPop = From nation In UNDataSet.Nations
Where nation.continent = lstContinents.Text
Order By nation.population Descending
Select nation.name
lstCountriesPop.DataSource = queryPop.ToList
lstCountriesPop.SelectedItem = Nothing
Dim queryArea = From nation In UNDataSet.Nations
Where nation.continent = lstContinents.Text
Order By nation.area Descending
Select nation.name
lstCountriesArea.DataSource = queryArea.ToList
lstCountriesArea.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 358 of 443)
18. Private Sub frmNations_Load(...) Handles MyBase.Load
Me.NationsTableAdapter.Fill(Me.UNDataSet.Nations)
Dim query = From nation In UNDataSet.Nations
Order By nation.continent Ascending
Select nation.continent
Distinct
lstContinents.DataSource = query.ToList
End Sub
Private Sub lstContinents_SelectedIndexChanged(...) Handles _
lstContinents.SelectedIndexChanged
Dim query = From nation In UNDataSet.Nations
Where nation.continent = lstContinents.Text
Let popDensity = 100000 * nation.population / nation.area
Order By popDensity Ascending
Let formattedDen = popDensity.ToString("N")
Select nation.name, formattedDen
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Country"
dgvOutput.Columns("formattedDen").HeaderText = "Population Density"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 359 of 443)
19. Private Sub Form1_Load(...) Handles MyBase.Load
Me.NationsTableAdapter.Fill(Me.UNDataSet.Nations)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From country In UNDataSet.Nations
Select country.area
Dim max As Double = query.Max
Dim min As Double = query.Min
Dim queryOutput = From country In UNDataSet.Nations
Where country.area = max Or
country.area = min
Order By country.area Descending
Select country.name, country.continent,
country.population, country.area
dgvOutput.DataSource = queryOutput.ToList
dgvOutput.CurrentCell = Nothing
End Sub
20. Private Sub frmCurrency_Load(...) Handles MyBase.Load
Me.RatesTableAdapter.Fill(Me.ExchrateDataSet.Rates)
Dim query = From money In ExchrateDataSet.Rates
Select money.country
lstCountries.DataSource = query.ToList
End Sub
Private Sub lstCountries_SelectedIndexChanged(...) Handles _
lstCountries.SelectedIndexChanged
Dim query = From money In ExchrateDataSet.Rates
Where money.country = lstCountries.Text
Select money.monetaryUnit, money.dollarRate
txtCurrency.Text = query.First.monetaryUnit
txtRate.Text = CStr(query.First.dollarRate)
End Sub
21. Private Sub frmCurrencies_Load(...) Handles MyBase.Load
Me.RatesTableAdapter.Fill(Me.ExchrateDataSet.Rates)
Dim query = From money In ExchrateDataSet.Rates
Order By money.dollarRate Ascending
Select money.country
lstCountries.DataSource = query.ToList
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 360 of 443)
Private Sub lstCountries_SelectedIndexChanged(...) Handles _
lstCountries.SelectedIndexChanged
Dim query = From money In ExchrateDataSet.Rates
Where money.country = lstCountries.Text
Select money.monetaryUnit, money.dollarRate
txtCurrency.Text = query.First.monetaryUnit
txtRate.Text = CStr(query.First.dollarRate)
End Sub
22. Private Sub frmCurrencies_Load(...) Handles MyBase.Load
Me.RatesTableAdapter.Fill(Me.ExchrateDataSet.Rates)
Dim query = From money In ExchrateDataSet.Rates
Select money.country
lstFrom.DataSource = query.ToList
lstTo.DataSource = query.ToList
End Sub
Private Sub btnConvert_Click(...) Handles btnConvert.Click
Dim amount As Double = CDbl(txtAmount.Text)
Dim fromCountry As String = lstFrom.Text
Dim toCountry As String = lstTo.Text
Dim queryFrom = From money In ExchrateDataSet.Rates
Where money.country = fromCountry
Select money.monetaryUnit, money.dollarRate
Dim fromRate As Double = queryFrom.First.dollarRate
Dim queryTo = From money In ExchrateDataSet.Rates
Where money.country = toCountry
Select money.monetaryUnit, money.dollarRate
Dim toRate As Double = queryTo.First.dollarRate
Dim convertedAmount = amount * toRate / fromRate
txtOutput.Text = amount.ToString("N") & " " &
queryFrom.First.monetaryUnit & "s from " &
lstFrom.Text & " equals " &
convertedAmount.ToString("N") & " " &
queryTo.First.monetaryUnit & "s from " &
lstTo.Text & "."
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 361 of 443)
23. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Dim query = From team In BaseballDataSet.Teams
Order By team.name
Select team.name
lstTeams.DataSource = query.ToList
End Sub
Private Sub lstTeams_SelectedIndexChanged(...) Handles _
lstTeams.SelectedIndexChanged
Dim query = From team In BaseballDataSet.Teams
Where team.name = lstTeams.Text
Select team.stadium
txtStadium.Text = query.First
End Sub
24. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From team In BaseballDataSet.Teams
Let battingAve = team.hits / team.atBats
Let formattedBattingAve = battingAve.ToString("N3")
Order By battingAve Ascending
Select team.name, team.stadium, formattedBattingAve
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Team"
dgvOutput.Columns("stadium").HeaderText = "Stadium"
dgvOutput.Columns("formattedBattingAve").HeaderText = "Batting Average"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 362 of 443)
25. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim query1 = From player In BaseballDataSet.Players
Order By player.hits Descending
Select player.hits
Dim mostHits As Double = query1.Max
Dim query2 = From player In BaseballDataSet.Players
Where player.hits = mostHits
Select player.name
lstOutput.DataSource = query2.ToList
lstOutput.SelectedItem = Nothing
End Sub
26. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnDetermine_Click(...) Handles btnDetermine.Click
Dim query1 = From player In BaseballDataSet.Players
Let battingAve = player.hits / player.atBats
Order By battingAve Descending
Select battingAve
Dim highestBattingAve As Double = query1.Max
Dim query2 = From player In BaseballDataSet.Players
Let battingAve = player.hits / player.atBats
Where battingAve = highestBattingAve
Select player.name
lstOutput.DataSource = query2.ToList
lstOutput.SelectedItem = Nothing
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 363 of 443)
27. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
Dim query = From team In BaseballDataSet.Teams
Order By team.name
Select team.name
lstTeams.DataSource = query.ToList
End Sub
Private Sub lstTeams_SelectedIndexChanged(...) Handles _
lstTeams.SelectedIndexChanged
Dim query = From player In BaseballDataSet.Players
Where player.team = lstTeams.Text
Let battingAve = player.hits / player.atBats
Let formattedBattingAve = battingAve.ToString("N3")
Order By battingAve Descending
Select player.name, formattedBattingAve
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Name"
dgvOutput.Columns("formattedBattingAve").HeaderText =
"Batting Average"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 364 of 443)
28. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
Dim query = From player In BaseballDataSet.Players
Let battingAve = player.hits / player.atBats
Where battingAve > 0.3
Order By battingAve Ascending
Let formattedBattingAve = battingAve.ToString("N3")
Select formattedBattingAve
Distinct
lstPlayers.DataSource = query.ToList
End Sub
Private Sub lstPlayers_SelectedIndexChanged(...) Handles _
lstPlayers.SelectedIndexChanged
Dim query = From player In BaseballDataSet.Players
Let battingAve = player.hits / player.atBats
Where battingAve.ToString("N3")= lstPlayers.Text
Let lastName = player.name.Split(" "c)(1)
Order By lastName Ascending
Select player.name, player.team
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Player"
dgvOutput.Columns("team").HeaderText = "Team"
End Sub
29. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim query1 = From team In BaseballDataSet.Teams
Where team.league = "American"
Select team.hits
Dim query2 = From team In BaseballDataSet.Teams
Where team.league = "American"
Select team.atBats
txtBattingAve.Text = (query1.Sum / query2.Sum).ToString("N3")
End Sub
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Instructor Solutions Manual (Page 365 of 443)
30. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
End Sub
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim query = From team In BaseballDataSet.Teams
Where team.league = "National"
Select team.hits
txtHits.Text = (query.Sum).ToString("N0")
End Sub
31. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnCount_Click(...) Handles btnCount.Click
Dim query = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Where team.league = "National"
Select player.name
txtNational.Text = (query.Count).ToString("N0")
End Sub
32. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnCount_Click(...) Handles btnCount.Click
Dim query = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Where team.location = "New York"
Select player.name
txtNY.Text = (query.Count).ToString("N0")
End Sub
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Instructor Solutions Manual (Page 366 of 443)
33. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
End Sub
Private Sub radAmerican_CheckedChanged(...) Handles _
radAmerican.CheckedChanged
DisplayPlayers("American")
End Sub
Private Sub radNational_CheckedChanged(...) Handles _
radNational.CheckedChanged
DisplayPlayers("National")
End Sub
Sub DisplayPlayers(group As String)
Dim query = From team In BaseballDataSet.Teams
Let battingAve = team.hits / team.atBats
Let formattedBattingAve = battingAve.ToString("N3")
Where team.league = group
Order By battingAve Descending
Select team.name, formattedBattingAve
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Team"
dgvOutput.Columns("formattedBattingAve").HeaderText = "Batting Average"
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 367 of 443)
34. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub radAmerican_CheckedChanged(...) Handles _
radAmerican.CheckedChanged
DisplayPlayers("American")
End Sub
Private Sub radNational_CheckedChanged(...) Handles _
radNational.CheckedChanged
DisplayPlayers("National")
End Sub
Sub DisplayPlayers(group As String)
Dim query = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Where team.league = group And player.hits > 150
Let battingAve = player.hits / player.atBats
Let formattedBattingAve = battingAve.ToString("N3")
Order By battingAve Descending
Select player.name, formattedBattingAve, team.stadium
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("name").HeaderText = "Player"
dgvOutput.Columns("formattedBattingAve").HeaderText = "Batting Average"
dgvOutput.Columns("stadium").HeaderText = "Stadium"
End Sub
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Instructor Solutions Manual (Page 368 of 443)
35. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
Dim query = From team In BaseballDataSet.Teams
Order By team.name
Select team.name
lstTeams.DataSource = query.ToList
End Sub
Private Sub lstTeams_SelectedIndexChanged(...) Handles _
lstTeams.SelectedIndexChanged
Dim query = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Let playerBattingAve = player.hits / player.atBats
Let teamBattingAve = team.hits / team.atBats
Where team.name = lstTeams.Text And
playerBattingAve > teamBattingAve
Order By playerBattingAve Descending
Select player.name
lstPlayers.DataSource = query.ToList
lstPlayers.SelectedItem = Nothing
End Sub
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Instructor Solutions Manual (Page 369 of 443)
36. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim ave = CDbl(txtAve.Text)
Dim group As String
If ave >= 0 And ave <= 1 Then
If radAmerican.Checked Then
group = "American"
Else
group = "National"
End If
Dim query = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Let playerBattingAve = player.hits / player.atBats
Where team.league = group And playerBattingAve > ave
Order By player.hits Descending
Select player.name
lstPlayers.DataSource = query.ToList
lstPlayers.SelectedItem = Nothing
Else
MessageBox.Show("The batting average must be between 0 and 1.")
txtAve.Clear()
txtAve.Focus()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 370 of 443)
37. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query1 = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Where team.league = "National" And player.atBats > 100
Let playerBattingAve = player.hits / player.atBats
Select playerBattingAve
Dim highestAve As Double = query1.Max
Dim query2 = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Let playerBattingAve = player.hits / player.atBats
Where team.league = "National" And
playerBattingAve = highestAve
Select player.name
lstPlayers.DataSource = query2.ToList
lstPlayers.SelectedItem = Nothing
End Sub
38. Private Sub frmBaseball_Load(...) Handles MyBase.Load
Me.TeamsTableAdapter.Fill(Me.BaseballDataSet.Teams)
Me.PlayersTableAdapter.Fill(Me.BaseballDataSet.Players)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query1 = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Where team.league = "American"
Select player.hits
Dim mostHits As Double = query1.Max
Dim query2 = From player In BaseballDataSet.Players
Join team In BaseballDataSet.Teams
On player.team Equals team.name
Where team.league = "American" And player.hits = mostHits
Select player.name
lstPlayers.DataSource = query2.ToList
lstPlayers.SelectedItem = Nothing
End Sub
39. film
40. film
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Instructor Solutions Manual (Page 371 of 443)
41. Private Sub frmMovies_Load(...) Handles MyBase.Load
Me.LinesTableAdapter.Fill(Me.MoviesDataSet.Lines)
Me.ActorsTableAdapter.Fill(Me.MoviesDataSet.Actors)
Dim query = From line In MoviesDataSet.Lines
Select line.film
Distinct
lstFilms.DataSource = query.ToList
End Sub
Private Sub lstFilms_SelectedIndexChanged(...) Handles _
lstFilms.SelectedIndexChanged
Dim query = From line In MoviesDataSet.Lines
Join flick In MoviesDataSet.Actors
On line.film Equals flick.film
Where line.film = lstFilms.Text
Select flick.maleLead
txtLead.Text = query.First
End Sub
42. Private Sub frmMovies_Load(...) Handles MyBase.Load
Me.LinesTableAdapter.Fill(Me.MoviesDataSet.Lines)
Me.ActorsTableAdapter.Fill(Me.MoviesDataSet.Actors)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From line In MoviesDataSet.Lines
Join flick In MoviesDataSet.Actors
On line.film Equals flick.film
Select line.famousLine, flick.maleLead, flick.film
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
dgvOutput.Columns("famousLine").HeaderText = "Famous Line"
dgvOutput.Columns("maleLead").HeaderText = "Actor"
dgvOutput.Columns("film").HeaderText = "Film"
End Sub
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Instructor Solutions Manual (Page 372 of 443)
43. Private Sub frmFilms_Load(...) Handles MyBase.Load
Me.LinesTableAdapter.Fill(Me.MoviesDataSet.Lines)
Me.ActorsTableAdapter.Fill(Me.MoviesDataSet.Actors)
Dim query = From flick In MoviesDataSet.Actors
Select flick.maleLead
Distinct
lstActors.DataSource = query.ToList
End Sub
Private Sub lstFilms_SelectedIndexChanged(...) Handles _
lstActors.SelectedIndexChanged
Dim query = From line In MoviesDataSet.Lines
Join flick In MoviesDataSet.Actors
On line.film Equals flick.film
Where flick.maleLead = lstActors.Text
Select line.famousLine
lstLines.DataSource = query.ToList
lstLines.SelectedItem = Nothing
End Sub
x
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Instructor Solutions Manual (Page 373 of 443)
44. Private Sub frmMovies_Load(...) Handles MyBase.Load
Me.ActorsTableAdapter.Fill(Me.MoviesDataSet.Actors)
Me.LinesTableAdapter.Fill(Me.MoviesDataSet.Lines)
Dim query = From flick In MoviesDataSet.Actors
Order By flick.film
Select flick.film
Distinct
lstMovies.DataSource = query.ToList
End Sub
Private Sub lstMovies_SelectedIndexChanged(...) Handles _
lstMovies.SelectedIndexChanged
Dim query = From line In MoviesDataSet.Lines
Join flick In MoviesDataSet.Actors
On line.film Equals flick.film
Where flick.film = lstMovies.Text
Select line.famousLine
lstLines.DataSource = query.ToList
lstLines.SelectedItem = Nothing
End Sub
EXERCISES 10.2
6. Add a record to the Cities table whose country is not in the Countries table.
7. Add a record to the Cities table whose name field is empty or contains the same name as an
already existing record.
8. Add a record to the Cities table with any or all of the country, pop2014 or pop2030 fields
empty.
9. BindingSource1.Find("name", strVar) = -1
10. Private Sub btnUpdate_Click(...) Handles btnUpdate.Click
Try
BindingSource1.EndEdit()
CitiesTableAdapter.Update(MEGACITIESDataSet.Cities)
Catch exp As OleDb.OleDbException
MessageBox.Show("Rule of Referential Integrity violated.")
End Try
End Sub
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Instructor Solutions Manual (Page 374 of 443)
11. Create a control named BindingSource2 that has the Countries table as its DataMember.
Private Sub CountryTextBox_Leave(...) Handles _
CountryTextBox.Leave, BindingNavigator1.Click
BindingSource2.Position = BindingSource2.Find("name",
CountryTextBox.Text)
If (CountryTextBox.Text <> "") And
(BindingSource2.Position = 0) And
(CountryTextBox.Text <> "Argentina") Then
MessageBox.Show("Not a valid country.", "ERROR")
CountryTextBox.Focus()
End If
End Sub
12. Private Sub NameTextBox_Leave(...) Handles _
NameTextBox.Leave, BindingNavigator1.Click
If NameTextBox.Text = "" Then
MessageBox.Show("You must include the name of a city.")
NameTextBox.Focus()
Else
Dim index As Integer = BindingSource1.Find("name", NameTextBox.Text)
If index <> 0 Then
MessageBox.Show("There is already a record for " &
NameTextBox.Text & ".")
NameTextBox.Focus()
End If
End If
End Sub
13. Private Sub frmMovies_Load(...) Handles MyBase.Load
Me.LinesTableAdapter.Fill(Me.MoviesDataSet.Lines)
End Sub
Private Sub btnUpdate_Click(...) Handles btnUpdate.Click
BindingSource1.EndEdit()
LinesTableAdapter.Update(MoviesDataSet.Lines)
End Sub
14. Private Sub frmMovies_Load(...) Handles MyBase.Load
Me.ActorsTableAdapter.Fill(Me.MOVIESDataSet.Actors)
End Sub
Private Sub btnUpdate_Click(...) Handles btnUpdate.Click
BindingSource1.EndEdit()
ActorsTableAdapter.Update(MOVIESDataSet.Actors)
End Sub
17. Apollo 13 does not appear in the key field of the Actors table. Thus the Rule of Referential
Integrity would be violated.
18. Casablanca appears in the film field of the Lines table. Thus, the Rule of Referential Integrity
would be violated. The
program will crash when the Update button is clicked.
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Instructor Solutions Manual (Page 375 of 443)
19. Replace the table with two tables. The first table should contain the fields name, address, and
city. The second table should contain the fields city, state, and stateCapital.
20. Replace the table with two tables. The first table should contain the fields name, state, and
party. The second table should contain the fields state, statePop, and numColleges.
21. Write a program similar to the one in Example 1, but using the database Justices accdb. Then use the
program to update the database.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 376 of 443)
CHAPTER 10 PROGRAMMING PROJECTS
1. Private Sub frmMicroland_Load(...) Handles MyBase.Load
Me.OrdersTableAdapter.Fill(Me.MICROLANDDataSet.Orders)
Me.InventoryTableAdapter.Fill(Me.MICROLANDDataSet.Inventory)
Me.CustomersTableAdapter.Fill(Me.MICROLANDDataSet.Customers)
End Sub
Private Sub btnStock_Click(...) Handles btnStock.Click
lstOutput.Items.Clear()
lstOutput.Items.Add("Here are the items that are out of inventory " &
"or must be reordered. ")
lstOutput.Items.Add("The numbers shown give the minimum reorder" &
"quantity required.")
lstOutput.Items.Add("")
Dim query1 = From item In MICROLANDDataSet.Orders
Order By item.itemID
Select item.itemID, item.quantity
Dim query2 = From item In MICROLANDDataSet.Inventory
Select item.itemID, item.quantity, item.description
Dim ID, desc As String
Dim quant As Integer
For Each item In query2
ID = item.itemID
quant = item.quantity
desc = item.description
Dim query3 = From ite In query1
Where ite.itemID = ID
Select CInt(ite.quantity)
If query3.Sum >= quant Then
lstOutput.Items.Add(ID & "
" & query3.Sum - quant & "
" & desc)
End If
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 377 of 443)
2. Private Sub frmGradeBook_Load(...) Handles MyBase.Load
Me.GradesTableAdapter.Fill(Me.GRADEBOOKDataSet.Grades)
Me.StudentsTableAdapter.Fill(Me.GRADEBOOKDataSet.Students)
End Sub
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
Dim query = From person1 In GRADEBOOKDataSet.Students
Join person2 In GRADEBOOKDataSet.Grades
On person1.socSecNumber Equals person2.socSecNumber
Let semGrade = ((person2.firstExam +
person2.secondExam + 2 * person2.finalExam) / 4).ToString("N4")
Let fullName = person1.firstName & " " & person1.lastName
Select fullName, semGrade
dgvSemesterGrades.DataSource = query.ToList
dgvSemesterGrades.CurrentCell = Nothing
End Sub
Private Sub btnUpdate_Click(...) Handles btnUpdate.Click
BindingSource2.EndEdit()
GradesTableAdapter.Update(GRADEBOOKDataSet.Grades)
MessageBox.Show("Grades table has been updated.")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 378 of 443)
CHAPTER 11
EXERCISES 11.1
1. Any negative grade will be recorded as 0 and any grade greater than 100 will be recorded as
100.
2.
Every grade will be curved by 10 points.
3. Remove the keyword WriteOnly from the Midterm property block and add the following Get
property procedure to it:
Get
Return m_midterm
End Get
4.
Add the following procedure to the Student class block:
Function Average() As Double
Return (m_midterm + m_final) / 2
End Function
5. The properties Midterm and Final are write-only.
6.
Sub New()
Midterm = 10
Final = 10
End Sub
7. The property SocSecNum is initialized to the value 999-99-9999.
8.
The line scholar = New Student should be inserted after the second line of the event
procedure.
9. The keyword New is missing from the third line of the event procedure.
10. The member variable m_name was assigned a value from outside the class code. Even if the
variable m_name were declared as Public, it would not be visible to the form’s code.
11. The statement nom = m_name is not valid. m_name would need to be Public and referred to
by scholar.m_name.
12. The statement
scholar.CalcSemGrade = "A"
is not valid. The method CalcSemGrade, which was defined by a Function
procedure, returns a value, but cannot be used to set a value.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 379 of 443)
13. The statements pupil.Midterm = scholar.Midterm and the statement
lstGrades.Items.Add(pupil.Midterm) are not valid. The Midterm property is writeonly; it can be set, but cannot return a value.
14. The first two lines must be combined into one line:
Dim scholar As New Student()
15. Country: Canada
Capital: Ottawa
Pop: 31 million
16. Replace the second line of the btnMove_Click event procedure with
round.Xcoord += 20
round.Ycoord += 20
17. Change 20 to –20 in the btnMove_Click event procedure, and create a frmCircle_Load
event procedure with the following lines,
round.Xcoord = picCircle.Width - 40
round.Ycoord = picCircle.Height - 40
18. Place the statement
Dim randomNum As New Random()
in the Declarations section of frmCircle's Code window, and replace the literal 20 with
randomNum.Next(0, 41) in the btnMove_Click event procedure.
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 380 of 443)
19. Class Square
Private m_length, m_perimeter, m_area As Double
Public Property Length() As Double
Get
Return m_length
End Get
Set(value As Double)
m_length = value
m_perimeter = value * 4
m_area = value * value
End Set
End Property
Public Property Perimeter() As Double
Get
Return m_perimeter
End Get
Set(value As Double)
m_perimeter = value
m_length = value / 4
m_area = value * value / 16
End Set
End Property
Public Property Area() As Double
Get
Return m_area
End Get
Set(value As Double)
m_area = value
m_length = Math.Sqrt(value)
m_perimeter = Math.Sqrt(value) * 4
End Set
End Property
End Class
'Square
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Instructor Solutions Manual (Page 381 of 443)
20. Class Square
Private m_length, m_perimeter, m_area As Double
Public Property Length() As Double
Get
Return m_length
End Get
Set(value As Double)
If value < 1 Then
value = 1
ElseIf value > 10 Then
value = 10
End If
m_length = value
m_perimeter = value * 4
m_area = value * value
End Set
End Property
Public Property Perimeter() As Double
Get
Return m_perimeter
End Get
Set(value As Double)
If value < 4 Then
value = 4
ElseIf value > 40 Then
value = 40
End If
m_perimeter = value
m_length = value / 4
m_area = value * value / 16
End Set
End Property
Public Property Area() As Double
Get
Return m_area
End Get
Set(value As Double)
If value < 1 Then
value = 1
ElseIf value > 100 Then
value = 100
End If
m_area = value
m_length = Math.sqrt(value)
m_perimeter = Math.sqrt(value) * 4
End Set
End Property
End Class
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Instructor Solutions Manual (Page 382 of 443)
21. Class PairOfDice
Private m_die1, m_die2 As Integer
Dim randomNum As New Random()
Public ReadOnly Property Die1() As Integer
Get
Return m_die1
End Get
End Property
Public ReadOnly Property Die2() As Integer
Get
Return m_die2
End Get
End Property
Public ReadOnly Property SumOfFaces() As Integer
Get
Return m_die1 + m_die2
End Get
End Property
Sub Roll()
m_die1 = randomNum.Next(1, 7)
m_die2 = randomNum.Next(1, 7)
End Sub
End Class
'PairOfDice
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Instructor Solutions Manual (Page 383 of 443)
22. Public Class frmDice
Private Sub btnRoll_Click(...) Handles btnRoll.Click
'Roll a pair of dice 1000 times.
Dim dice As New PairOfDice()
Dim count As Integer = 0
'Loop 1000 times.
For i As Integer = 1 To 1000
dice.Roll()
'If the sum is 7, then count it.
If dice.SumOfFaces = 7 Then
count += 1
End If
Next
'Display result.
txtOutput.Text = "7 appeared " & count & " times."
End Sub
End Class
'frmDice
Class PairOfDice
Private m_die1, m_die2, m_sum As Integer
Dim randomNum As New Random()
'Random number generator
Public ReadOnly Property Die1() As Integer
Get
Return m_die1
End Get
End Property
Public ReadOnly Property Die2() As Integer
Get
Return m_die2
End Get
End Property
Public ReadOnly Property SumOfFaces() As Integer
Get
Return m_die1 + m_die2
End Get
End Property
Sub Roll()
'A die can have numbers between 1 and 6 inclusive
m_die1 = randomNum.Next(1, 7)
m_die2 = randomNum.Next(1, 7)
End Sub
End Class
'PairOfDice
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Instructor Solutions Manual (Page 384 of 443)
23. Class College
Private m_name As String
Private m_students, m_faculty As Double
Public WriteOnly Property Name() As String
Set(Value As String)
m_name = Value
End Set
End Property
Public WriteOnly Property NumStudents() As Double
Set(Value As Double)
m_students = Value
End Set
End Property
Public WriteOnly Property NumFaculty() As Double
Set(Value As Double)
m_faculty = Value
End Set
End Property
Function SFRatio() As Double
Return m_students / m_faculty
End Function
End Class
'College
24. Public Class frmWages
Dim salary As New Wages()
Private Sub btnCalculatePay_Click(...) Handles btnCalculatePay.Click
'Calculate weekly wage from input values in text boxes.
salary.Hours = CDbl(txtHours.Text)
salary.Wage = CDec(txtWage.Text)
txtPay.Text = (salary.PayForWeek).ToString("C")
End Sub
End Class
'frmWages
Class Wages
Private m_hours As Double
Private m_wage As Decimal
'Number of hours worked during week
'Hourly wage
Public WriteOnly Property Hours() As Double
Set(value As Double)
m_hours = value
End Set
End Property
Public WriteOnly Property Wage() As Decimal
Set(value As Decimal)
m_wage = value
End Set
End Property © 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 385 of 443)
Function PayForWeek() As Decimal
'Calculate pay for the week.
Return CDec(m_hours * m_wage)
End Function
End Class
'Wages
25. Public Class frmCashRegister
Dim register As New CashRegister()
Private Sub btnAdd_Click(...) Handles btnAdd.Click
'Add an amount to the balance.
register.Add(CDec(txtAmount.Text))
txtBalance.Text = (register.Balance).ToString("C")
txtAmount.Clear()
txtAmount.Focus()
End Sub
Private Sub btnSubtract_Click(...) Handles btnSubtract.Click
'Subtract an amount from the balance.
register.Subtract(CDec(txtAmount.Text))
txtBalance.Text = (register.Balance).ToString("C")
txtAmount.Clear()
txtAmount.Focus()
End Sub
End Class
'frmCashRegister
Class CashRegister
Private m_balance As Decimal
Public ReadOnly Property Balance() As Decimal
Get
Return m_balance
End Get
End Property
Sub Add(amount As Decimal)
If (m_balance + amount) >= 0 Then 'Ensure balance stays nonnegative
m_balance += amount
End If
End Sub
Sub Subtract(amount As Decimal)
If (m_balance - amount) >= 0 Then 'Ensure balance stays nonnegative
m_balance = m_balance - amount
End If
End Sub
End Class
'CashRegister
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 386 of 443)
26. Public Class frmAverage
Dim stats As New Statistics()
Private Sub btnRecord_Click(...) Handles btnRecord.Click
'Add a number to the statistics.
stats.AddNumber(CInt(txtNumber.Text))
'Clear and set the focus to the number text box.
txtNumber.Clear()
txtNumber.Focus()
End Sub
Private Sub btnAverage_Click(...) Handles btnAverage.Click
'Calculate and display the average
txtAverage.Text = (stats.Average).ToString("N")
End Sub
End Class
'frmAverage
Class Statistics
Private m_numbers(49) As Integer
Private m_count As Integer
'Count of numbers entered into array
Sub AddNumber(number As Integer)
'Adds a number to the statistics
m_count += 1
m_numbers(m_count) = number
End Sub
Public ReadOnly Property Count() As Integer
'Counter of numbers stored
Get
Return m_count
End Get
End Property
Function Average() As Double
'Computes the average
Dim sum As Integer = 0
For i As Integer = 1 To m_count
sum += m_numbers(i)
Next
Return sum / m_count
End Function
End Class
'Statistics
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 387 of 443)
27. Public Class frmFICA
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim tax As New FICA()
tax.PreviousEarnings = CDec(txtToDate.Text)
tax.CurrentEarnings = CDec(txtCurrent.Text)
txtTax.Text = (tax.CalculateFICA).ToString("C")
End Sub
End Class
'frmFICA
Class FICA
'Member variables store property values.
Private m_previousEarnings As Decimal 'Previous year-to-date earnings
Private m_currentEarnings As Decimal
Public WriteOnly Property PreviousEarnings() As Decimal
Set(Value As Decimal)
m_previousEarnings = Value
End Set
End Property
Public WriteOnly Property CurrentEarnings() As Decimal
Set(Value As Decimal)
m_currentEarnings = Value
End Set
End Property
Function CalculateFICA() As Decimal
'Calculate social security benefits tax and medicare tax
'for a single employee
Const WAGE_BASE As Decimal = 118500D
'There is no social security
'
benefits tax on income above this level.
Const SOCIAL_SECURITY_RATE As Decimal = 0.062D
Const MEDICARE_RATE As Decimal = 0.0145D
'Dim ytdEarnings, curEarnings, totalEarnings As Decimal
Dim totalEarnings, socialSecurityBenTax, medicareTax As Decimal
totalEarnings = m_previousEarnings + m_currentEarnings
'Calculate the Social Security Benefits tax.
If totalEarnings <= WAGE_BASE Then
socialSecurityBenTax = SOCIAL_SECURITY_RATE * m_currentEarnings
ElseIf m_previousEarnings < WAGE_BASE Then
socialSecurityBenTax = SOCIAL_SECURITY_RATE *
(WAGE_BASE - m_previousEarnings)
End If
'Calculate the FICA tax.
medicareTax = MEDICARE_RATE * m_currentEarnings
If totalEarnings >= 200000D Then
medicareTax += 0.009D * (totalEarnings - 200000D)
End If
Return socialSecurityBenTax + medicareTax
'FICA tax
End Function
End Class
'FICA
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 388 of 443)
28. Public Class frmAdd
Dim x As New Fraction()
Dim y As New Fraction()
Dim z As New Fraction()
'left fraction
'Middle fraction
'Right fraction
Private Sub btnResult_Click(...) Handles btnResult.Click
'Add the x and y fractions to get the z fraction.
'Store the input into the x and y fractions.
x.Num = CInt(txtNumX.Text)
x.Den = CInt(txtDenX.Text)
y.Num = CInt(txtNumY.Text)
y.Den = CInt(txtDenY.Text)
'Add the two fractions.
z.Num = (x.Num * y.Den) + (y.Num * x.Den)
z.Den = x.Den * y.Den
'Reduce and display the result.
z.Reduce()
txtNumZ.Text = CStr(z.Num)
txtDenZ.Text = CStr(z.Den)
End Sub
End Class
'frmAdd
Class Fraction
Private m_num As Double
Private m_den As Double = 1
'Numerator
'Denominator set to default value
Public Property Num() As Double
Get
Return m_num
End Get
Set(Value As Double)
m_num = Value
End Set
End Property
Public Property Den() As Double
Get
Return m_den
End Get
Set(Value As Double)
m_den = Value
End Set
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 389 of 443)
Sub Reduce()
Dim t As Double
Dim m As Double = m_num
Dim n As Double = m_den
'Algorithm to calculate greatest common divisor of m and n.
'After the loop terminates, the value of m will be the GCD.
Do While (n <> 0)
t = n
n = m Mod n
m = t
Loop
'Divide both numerator and denominator by greatest common divisor.
If m <> 0 Then
m_num = m_num / m
m_den = m_den / m
End If
End Sub
End Class
'Fraction
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 390 of 443)
29. Public Class frmMortgage
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim loan As New Mortgage
loan.Principal = CDec(txtPrincipal.Text)
loan.InterestRate = CDec(txtInterestRate.Text)
loan.Years = CInt(txtYears.Text)
txtMonthlyPayment.Text = (loan.calculateMonthlyPayment).ToString("C2")
End Sub
End Class
'frmMortgage
Class Mortgage
Private m_principal As Decimal
Private m_interestRate As Decimal
Private m_years As Integer
Public WriteOnly Property Principal() As Decimal
Set(value As Decimal)
m_principal = value
End Set
End Property
Public WriteOnly Property InterestRate() As Decimal
Set(value As Decimal)
m_interestRate = value
End Set
End Property
Public WriteOnly Property Years() As Integer
Set(value As Integer)
m_years = value
End Set
End Property
Function calculateMonthlyPayment() As Decimal
Dim i As Decimal
i = m_interestRate / 1200
Return ((i / (1 - ((1 + i) ^ (-12 * m_years)))) * m_principal)
End Function
End Class
'Mortgage
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 391 of 443)
EXERCISES 11.2
1. Sub btnDisplay_Click(...) Handles btnDisplay.Click
ReDim Preserve students(lastStudentAdded)
Dim query = From pupil In students
Let name = pupil.Name
Let ssn = pupil.SocSecNum
Let semGrade = pupil.CalcSemGrade
Where semGrade = "A"
Select pupil.Name, pupil.SocSecNum, pupil.CalcSemGrade
dgvGrades.DataSource = query.ToList
dgvGrades.CurrentCell = Nothing
dgvGrades.Columns("Name").HeaderText = "Student Name"
dgvGrades.Columns("SocSecNum").HeaderText = "SSN"
dgvGrades.Columns("CalcSemGrade").HeaderText = "Grade"
ReDim Preserve students(50)
txtName.Focus()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 392 of 443)
2.
Class State
'Member variables hold property values.
Private m_name, m_abbr, m_entered As String
Private m_area, m_pop As Double
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
Public ReadOnly Property Abbreviation() As String
Get
Return m_abbr
End Get
End Property
Public ReadOnly Property Entered() As String
Get
Return m_entered
End Get
End Property
Public ReadOnly Property Area() As Double
Get
Return m_area
End Get
End Property
Public ReadOnly Property Population() As Double
Get
Return m_pop
End Get
End Property
Public Sub New(n As String, a As String, _
e As String, ar As Double, p As Double)
'Store parameters into member variables.
m_name = n
m_abbr = a
m_entered = e
m_area = ar
m_pop = p
End Sub
Function Density() As Double
Return m_pop / m_area
End Function
End Class
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 393 of 443)
3. Public Class frmStates
Dim states(49) As State 'Holds the state's data
Private Sub frmStates_Load(...) Handles MyBase.Load
'Load the data file into the array
Dim usstates() As String = IO.File.ReadAllLines("UnitedStates.txt")
Dim data() As String
For i As Integer = 0 To 49
data = usstates(i).Split(","c)
states(i) = New State(data(0), data(1), CDate(data(2)),
CDbl(data(3)), CDbl(data(4)))
Next
End Sub
Private Sub btnLookup_Click(...) Handles btnLookup.Click
'Look up name in the array and return the state information.
Dim nm As String
Dim i As Integer = 0
'Get name of state from message box
nm = InputBox("Name of state:", "Enter state's name").ToUpper
'Clear the output text boxes
txtName.Clear()
txtAbbr.Clear()
txtDensity.Clear()
txtEntered.Clear()
Dim query = From state In states
Where state.Name.ToUpper = nm.ToUpper
Select state.Name, state.Abbreviation,
state.Density, state.Entered
txtName.Text = query.First.Name
txtAbbr.Text = query.First.Abbreviation
txtDensity.Text = (query.First.Density).ToString("N1")
txtEntered.Text = (query.First.Entered).ToString("D")
End Sub
End Class
'frmStates
Class State
Private m_name, m_abbr As String
Private m_entered As Date
Private m_area As Double
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
Public ReadOnly Property Abbreviation() As String
Get
Return m_abbr
End Get
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 394 of 443)
Public ReadOnly Property Entered() As Date
Get
Return m_entered
End Get
End Property
Public ReadOnly Property Area() As Double
Get
Return m_area
End Get
End Property
Public Property Population() As Double
Sub New(n As String, a As String, e As Date,
ar As Double, p As Double)
'Store parameters into member variables
m_name = n
m_abbr = a
m_entered = e
m_area = ar
_Population = p
End Sub
Function Density() As Double
'Density is calculated as population divided by area.
Return _Population / m_area
End Function
End Class
'State
4. Public Class frmStates
Dim states(49) As State
'Stores state data
Private Sub frmStates_Load(...) Handles MyBase.Load
'Load the data file into the array
Dim usstates() As String =
IO.File.ReadAllLines("United_States.txt")
Dim data() As String
For i As Integer = 0 To 49
data = usstates(i).Split(","c)
states(i) = New State(data(0), data(1),
CDate(data(2)), CDbl(data(3)), CDbl(data(4)))
Next
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 395 of 443)
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Display the states and their densities ordered by density.
Dim query = From state In states
Order By state.Density Descending
Let Density = (state.Density).ToString("N1")
Select state.Name, Density
dgvOutput.DataSource = query.ToList
dgvOutput.CurrentCell = Nothing
End Sub
End Class
'frmStates
Class State
Private m_name, m_abbr As String
Private m_entered As Date
Private m_area As Double
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
Public ReadOnly Property Abbreviation() As String
Get
Return m_abbr
End Get
End Property
Public ReadOnly Property Entered() As Date
Get
Return m_entered
End Get
End Property
Public ReadOnly Property Area() As Double
Get
Return m_area
End Get
End Property
Public Property Population() As Double
Sub New(n As String, a As String, e As Date,
ar As Double, p As Double)
'Store parameters into member variables
m_name = n
m_abbr = a
m_entered = e
m_area = ar
_Population = p
End Sub
Function Density() As Double
'Density is calculated as population divided by area.
Return _Population / m_area
End Function
End Class
'State
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 396 of 443)
5. Public Class frmStates
Dim WithEvents usa As New UnitedStates()
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Load the data file into the array.
Dim sr As IO.StreamReader = IO.File.OpenText("UnitedStates.txt")
For i As Integer = 0 To 49
'Add each state to the USA object
Dim data() As String = Split(sr.ReadLine, ","c)
usa.Add(New State(data(0), data(1), CDate(data(2)),
CDbl(data(3)), CDbl(data(4))))
Next
sr.Close()
End Sub
Sub Populous(name As String, population As Double) Handles usa.Populous
'Display the populous states and their populations in the list box.
lstOutput.Items.Add(name & ": " & population.ToString("N0"))
End Sub
End Class
'frmStates
Class UnitedStates
Dim states(49) As State 'Holds the state data
Dim count As Integer
'Last stored state
'The event contains the state's name and population
Public Event Populous(name As String, population As Double)
Sub Add(state As State)
'Add the state to the array
states(count) = state
count += 1
'If the state's population is large then raise an event
If state.Population > 10000000 Then
RaiseEvent Populous(state.Name, state.Population)
End If
End Sub
End Class
'UnitedStates
Class State
Private m_name, m_abbr As String
Private m_entered As Date
Private m_area As Double
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
Public ReadOnly Property Abbreviation() As String
Get
Return m_abbr
End Get
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 397 of 443)
Public ReadOnly Property Entered() As Date
Get
Return m_entered
End Get
End Property
Public ReadOnly Property Area() As Double
Get
Return m_area
End Get
End Property
Public Property Population() As Double
Sub New(n As String, a As String, e As Date,
ar As Double, p As Double)
'Store parameters into member variables
m_name = n
m_abbr = a
m_entered = e
m_area = ar
_Population = p
End Sub
Function Density() As Double
'Density is calculated as population divided by area.
Return _Population / m_area
End Function
End Class
'State
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 398 of 443)
6. Public Class frmDice
Dim WithEvents dice As New PairOfDice()
Private Sub btnRoll_Click(...) Handles btnRoll.Click
dice.Roll()
'Roll the dice.
'Display the results.
txtDie1.Text = CStr(dice.Die1)
txtDie2.Text = CStr(dice.Die2)
End Sub
Sub dice_SnakeEyes() Handles dice.SnakeEyes
txtDie1.Text = CStr(dice.Die1)
txtDie2.Text = CStr(dice.Die2)
MessageBox.Show("Snake Eyes!")
End Sub
End Class
'frmDice
Class PairOfDice
Private m_die1, m_die2 As Integer
Dim randomNum As New Random()
'Random number generator
Public Event SnakeEyes()
Public ReadOnly Property Die1() As Integer
Get
Return m_die1
End Get
End Property
Public ReadOnly Property Die2() As Integer
Get
Return m_die2
End Get
End Property
Public ReadOnly Property SumOfFaces() As Integer
Get
Return m_die1 + m_die2
End Get
End Property
Sub Roll()
m_die1 = randomNum.Next(1, 7)
m_die2 = randomNum.Next(1, 7)
'If snake eyes, then raise the event.
If (m_die1 = 1) And (m_die2 = 1) Then
RaiseEvent SnakeEyes()
End If
End Sub
End Class
'PairOfDice
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 399 of 443)
7. Public Class frmCashRegister
Dim WithEvents register As New CashRegister()
Private Sub btnAdd_Click(...) Handles btnAdd.Click
'Add an amount to the balance.
register.Add(CDec(txtAmount.Text))
'Display the new result.
txtBalance.Text = (register.Balance).ToString("C")
txtAmount.Clear()
txtAmount.Focus()
End Sub
Private Sub btnSubtract_Click(...) Handles btnSubtract.Click
'Subtract an amount from the balance.
register.Subtract(CDec(txtAmount.Text))
'Display the new result.
txtBalance.Text = (register.Balance).ToString("C")
txtAmount.Clear()
txtAmount.Focus()
End Sub
Private Sub AttemptToOverdraw(amt As Decimal) Handles _
register.AttemptToOverdraw
MessageBox.Show("You would have been overdrawn by " &
amt.ToString("C") & ".", "Withdrawal Denied")
End Sub
End Class
'frmCashRegister
Class CashRegister
Private m_balance As Decimal
Public Event AttemptToOverdraw(amt As Decimal)
Public ReadOnly Property Balance() As Decimal
Get
Return m_balance
End Get
End Property
Sub Add(amount As Decimal)
If (m_balance + amount) >= 0 Then 'Make sure balance does not go negative.
m_balance += amount
Else
RaiseEvent AttemptToOverdraw(amount - m_balance)
End If
End Sub
Sub Subtract(amount As Decimal)
If (m_balance - amount) >= 0 Then 'Make sure balance does not go negative.
m_balance = m_balance - amount
Else
RaiseEvent AttemptToOverdraw(amount - m_balance)
End If
End Sub
End Class
'CashRegister
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 400 of 443)
8.
Public Class frmSquare
Dim WithEvents poly As Square
Sub poly_IllegalNumber(name As String, num As Double) Handles _
poly.IllegalNumber
MessageBox.Show("You cannot set the " & name & " to " & num)
End Sub
Private Sub btnGo_Click(...) Handles btnGo.Click
poly = New Square()
poly.Area = -25
txtLength.Text = CStr(poly.Length)
txtPerimeter.Text = CStr(poly.Perimeter)
End Sub
End Class
'frmSquare
Class Square
Private m_length, m_perimeter, m_area As Double
Event IllegalNumber(name As String, num As Double)
Public Property Length() As Double
Get
Return m_length
End Get
Set(value As Double)
If value < 0 Then
RaiseEvent IllegalNumber("Length", value)
Else
m_length = value
m_perimeter = value * 4
m_area = value * value
End If
End Set
End Property
Public Property Perimeter() As Double
Get
Return m_perimeter
End Get
Set(value As Double)
If value < 0 Then
RaiseEvent IllegalNumber("Perimeter", value)
Else
m_perimeter = value
m_length = value / 4
m_area = value * value / 16
End If
End Set
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 401 of 443)
Public Property Area() As Double
Get
Return m_area
End Get
Set(value As Double)
If value < 0 Then
RaiseEvent IllegalNumber("Area", value)
Else
m_area = value
m_length = Math.sqrt(value)
m_perimeter = Math.sqrt(value) * 4
End If
End Set
End Property
End Class
9. Public Class frmAdd
Dim WithEvents x As New Fraction()
Dim WithEvents y As New Fraction()
Dim WithEvents z As New Fraction()
'Left fraction
'Middle fraction
'Right fraction
Private Sub btnResult_Click(...) Handles btnResult.Click
'Add the x and y fractions to get the z fraction.
'Store the input into the x and y fractions.
x.Num = CInt(txtNumX.Text)
x.Den = CInt(txtDenX.Text)
y.Num = CInt(txtNumY.Text)
y.Den = CInt(txtDenY.Text)
'Add the two fractions.
z.Num = (x.Num * y.Den) + (y.Num * x.Den)
z.Den = x.Den * y.Den
'Reduce and display the result.
z.Reduce()
txtNumZ.Text = CStr(z.Num)
txtDenZ.Text = CStr(z.Den)
End Sub
Sub fraction_ZeroDenominator() Handles x.ZeroDenominator,
y.ZeroDenominator
'If x or y has a zero denominator, display an error message.
Dim message As String = "You cannot set a denominator to zero. " &
"All such denominators will be replaced by 1."
MessageBox.Show(message)
If txtDenX.Text = "0" Then
txtDenX.Text = CStr(1)
x.Den = 1
End If
If txtDenY.Text = "0" Then
txtDenY.Text = CStr(1)
y.Den = 1
End If
End Sub
End Class
'frmAdd
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 402 of 443)
Class Fraction
Private m_den As Double = 1
'Denominator set to default value
Public Event ZeroDenominator()
Public Property Num() As Double
Public Property Den() As Double
Get
Return m_den
End Get
Set(Value As Double)
'Raise the event if zero
If Value = 0 Then
RaiseEvent ZeroDenominator()
Else
m_den = Value
End If
End Set
End Property
Sub Reduce()
Dim t As Double
Dim m As Double = Num
Dim n As Double = m_den
'Algorithm to calculate greatest common divisor of m and n.
'After the loop terminates, the value of m will be the GCD.
Do While (n <> 0)
t = n
n = m Mod n
m = t
Loop
'Divide both numerator and denominator by greatest common divisor.
If m <> 0 Then
Num = Num / m
m_den = m_den / m
End If
End Sub
End Class
'Fraction
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 403 of 443)
10. Public Class frmCalculator
Dim calc As New Calculator()
Sub ReadFractions()
'Read the text boxes into the fractions
calc.x.Num = CInt(mtbNumX.Text)
calc.x.Den = CInt(mtbDenX.Text)
calc.y.Num = CInt(mtbNumY.Text)
calc.y.Den = CInt(mtbDenY.Text)
End Sub
Sub DisplayResult()
'Display the values from the z fraction
txtNumZ.Text = CStr(calc.z.Num)
txtDenZ.Text = CStr(calc.z.Den)
End Sub
Private Sub btnPlus_Click(...) Handles btnPlus.Click
'Read the fractions, add them and display the result
ReadFractions()
calc.Add()
DisplayResult()
End Sub
Private Sub bntMinus_Click(...) Handles bntMinus.Click
'Read the fractions, subtract them and display the result
ReadFractions()
calc.Subtract()
DisplayResult()
End Sub
Private Sub btnMultiply_Click(...) Handles btnMultiply.Click
'Read the fractions, multiply them and display the result
ReadFractions()
calc.Multiply()
DisplayResult()
End Sub
Private Sub bntDivide_Click(...) Handles bntDivide.Click
'Read the fractions, divide them and display the result
ReadFractions()
calc.Divide()
DisplayResult()
End Sub
End Class
'frmCalculator
Public Class Calculator
Private m_x As New Fraction()
Private m_y As New Fraction()
Private m_z As New Fraction()
'Left fraction
'Middle fraction
'Right fraction
Public ReadOnly Property x() As Fraction
Get
Return m_x
End Get
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 404 of 443)
Public ReadOnly Property y() As Fraction
Get
Return m_y
End Get
End Property
Public ReadOnly Property z() As Fraction
Get
Return m_z
End Get
End Property
Sub Add()
'Add the numerators, using the common denominator multiple
z.Num = (x.Num * y.Den) + (y.Num * x.Den)
z.Den = x.Den * y.Den
'Reduce the result.
z.Reduce()
End Sub
Sub Subtract()
'Subtract the numerators, using the common denominator multiple
z.Num = (x.Num * y.Den) - (y.Num * x.Den)
z.Den = x.Den * y.Den
'Reduce the result
z.Reduce()
End Sub
Sub Multiply()
'Multiply the numerators and denominators
z.Num = x.Num * y.Num
z.Den = x.Den * y.Den
'Reduce the result
z.Reduce()
End Sub
Sub Divide()
'Multiply the first fraction by the inverse of the second
z.Num = x.Num * y.Den
z.Den = x.Den * y.Num
'Reduce the result
z.Reduce()
End Sub
End Class
'Calculator
Public Class Fraction
Private m_num As Double
Private m_den As Double = 1
'Numerator
'Denominator set to default value
Public Property Num() As Double
Get
Return m_num
End Get
Set(Value As Double)
m_num = Value
End Set
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 405 of 443)
Public Property Den() As Double
Get
Return m_den
End Get
Set(Value As Double)
m_den = Value
End Set
End Property
Sub Reduce()
Dim t As Double
Dim m As Double = Num
Dim n As Double = Den
'Algorithm to calculate greatest common divisor of m and n.
'After the loop terminates, the value of m will be the GCD.
Do While (n <> 0)
t = n
n = m Mod n
m = t
Loop
'Divide both numerator and denominator by greatest common divisor.
If (m <> 0) Then
m_num = m_num / m
m_den = m_den / m
End If
End Sub
End Class
'Fraction
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 406 of 443)
11. Public Class frmDice
Dim game As New HighRoller()
Private Sub btnPlay_Click(...) Handles btnPlay.Click
'Play the game.
game.Play()
'Display the throws.
Randomize()
txt1Die1.Text = CStr(game.First.Die1)
txt1Die2.Text = CStr(game.First.Die2)
txt2Die1.Text = CStr(game.Second.Die1)
txt2Die2.Text = CStr(game.Second.Die2)
'Display the results
Select Case game.First.SumOfFaces
Case game.Second.SumOfFaces
txtOutput.Text = "Tie."
Case Is > game.Second.SumOfFaces
txtOutput.Text = "Player 1 wins."
Case Else
txtOutput.Text = "Player 2 wins."
End Select
End Sub
End Class
'frmDice
Class HighRoller
Private m_first As PairOfDice
Private m_second As PairOfDice
'First player
'Second player
Public Sub New()
m_first = New PairOfDice()
'The time is used to determine how the sequence of random numbers
'will be generated. The For...Next loop below guarantees that the
'two random number generators will act differently. Without the
'For...Next loop, often the two rolls will be identical.
For i As Integer = 1 To 10000000
Next
Second = New PairOfDice()
End Sub
Public ReadOnly Property First() As PairOfDice
Get
Return m_first
End Get
End Property
Public Property Second() As PairOfDice
Get
Return m_second
End Get
Set(value As PairOfDice)
m_second = value
End Set
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 407 of 443)
Sub Play()
'Roll both pairs of dice.
m_first.Roll()
m_second.Roll()
End Sub
End Class
'HighRoller
Class PairOfDice
Private m_die1, m_die2 As Integer
Dim randomNum As New Random() 'Random number generator
Public ReadOnly Property Die1() As Integer
Get
Return m_die1
End Get
End Property
Public ReadOnly Property Die2() As Integer
Get
Return m_die2
End Get
End Property
Public ReadOnly Property SumOfFaces() As Integer
Get
Return m_die1 + m_die2
End Get
End Property
Sub Roll()
'Get random numbers between 1 through 6 inclusive.
m_die1 = randomNum.Next(1, 7)
m_die2 = randomNum.Next(1, 7)
End Sub
End Class
'PairOfDice
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 408 of 443)
12. Public Class frmCashRegister
Dim WithEvents regular As New Choices()
'Regular menu
Dim WithEvents kids As New Choices()
'Kids menu
Dim WithEvents order As New Choices()
'Current order
Private Sub frmCashRegister_Load(...) Handles MyBase.Load
'Initialize the regular and kids menus.
Dim m As Food
'Populate regular choices
m = New Food("pizza slice", 1.75D)
regular.Add(m)
m = New Food("burger", 2.55D)
regular.Add(m)
m = New Food("salad", 3.29D)
regular.Add(m)
m = New Food("large soda", 1.25D)
regular.Add(m)
m = New Food("medium soda", 0.9D)
regular.Add(m)
'Populate kids choices
m = New Food("hot dog", 1.5D)
kids.Add(m)
m = New Food("small soda", 0.6D)
kids.Add(m)
m = New Food("cookie", 0.96D)
kids.Add(m)
'Display menus in list box
For i As Integer = 0 To (regular.Count – 1)
lstRegular.Items.Add(regular.Entry(i).Name & " (" &
(regular.Entry(i).Price).ToString("C") & ")")
Next
For i As Integer = 0 To (kids.Count – 1)
lstKids.Items.Add(kids.Entry(i).Name & " (" &
(kids.Entry(i).Price).ToString("C") & ")")
Next
End Sub
Private Sub btnRegular_Click(...) Handles btnRegular.Click
'Add an item from the regular menu to the order
Dim choice As Integer
'Get the current choice; index starts at zero.
choice = lstRegular.SelectedIndex
If choice >= 0 Then
'Add an item from a menu to the order.
Dim ent As Food
'Get the food item selected
ent = regular.Entry(choice)
'Add it to the order, and display it.
order.Add(ent)
lstOrder.Items.Add(ent.Name & " (" & (ent.Price).ToString("C") & ")")
End If
End Sub
Private Sub btnKids_Click(...) Handles btnKids.Click
'Add an item from the kids menu to the order.
Dim choice As Integer
'Get the current choice; index starts at zero.
choice = lstKids.SelectedIndex
If choice >= 0 Then
'Add an item from a menu to the order.
Dim ent As Food
'Get the food item selected
ent = kids.Entry(choice)
'Add it to the order, and display it.
order.Add(ent)
lstOrder.Items.Add(ent.Name & " (" & (ent.Price).ToString("C") & ")")
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 409 of 443)
Private Sub btnClear_Click(...) Handles btnClear.Click
order.Clear()
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
End
'Terminate the program.
End Sub
Private Sub order_ChoiceChanged(price As Decimal) Handles _
order.ChoiceChanged
'When the order has changed, update the price.
If price = 0 Then
'If the price is 0, then the order was cleared.
'Clear the display and total.
lstOrder.Items.Clear()
txtTotal.Clear()
Else
'Display the new total for the order.
txtTotal.Text = (order.Total).ToString("C")
End If
End Sub
End Class
'frmCashRegister
Class Choices
Dim m_entries(10) As Food
'Initial limit is 11 entries
Private m_lastEntryAdded As Integer 'Keeps track of # of entries
Private m_total As Decimal
'Total price of the order
Public Event ChoiceChanged(price As Decimal)
Public ReadOnly Property Entry(i As Integer) As Food
Get
'Return the item at the desired subscript.
Return m_entries(i)
End Get
End Property
Public ReadOnly Property Count() As Integer
Get
Return m_lastEntryAdded
End Get
End Property
Public ReadOnly Property Total() As Decimal
Get
Return m_total
End Get
End Property
Sub Add(Item As Food)
'Add the food item.
'Make room for the new item.
If (m_entries.Count – 1) < m_lastEntryAdded Then
ReDim Preserve m_entries(m_lastEntryAdded + 5)
End If
'Store the item.
m_entries(m_lastEntryAdded) = Item
'Add the items price to the menu's total
m_total += Item.Price
'Raise the event with the new item as parameter.
RaiseEvent ChoiceChanged(Item.Price)
m_lastEntryAdded += 1
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 410 of 443)
Sub Clear()
'Reset the counter and total.
m_lastEntryAdded = 0
m_total = 0
'Raise the event with 0 as parameter.
RaiseEvent ChoiceChanged(0)
End Sub
End Class
'Choices
Class Food
'Member variables hold property values
Private m_name As String
Private m_price As Decimal
Public Sub New(name As String, price As Decimal)
'Set the member variables to the parameter values.
m_name = name
m_price = price
End Sub
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
Public ReadOnly Property Price() As Decimal
Get
Return m_price
End Get
End Property
End Class
'Food
13. Public Class frmPayroll
Dim emp As New Employee()
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
'Read input and display paycheck receipt
Dim wages, takeHome As Decimal
'Store input into properties
emp.Name = txtName.Text
emp.Hours = CDec(txtHours.Text)
emp.Salary = CDec(txtSalary.Text)
emp.YearToDate = CDec(txtYtd.Text)
emp.Withhold = CInt(txtWithhold.Text)
emp.Married = radMarried.Checked
'Calculate take-home pay.
wages = emp.Hours * emp.Salary
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 411 of 443)
takeHome = wages - emp.FICA - emp.Withholding
'Display paycheck receipt.
lstOutput.Items.Clear()
lstOutput.Items.Add("Name: " & emp.Name)
lstOutput.Items.Add("Weekly wages: " & wages.ToString("C"))
lstOutput.Items.Add("Year-to-Date wages: " &
(emp.YearToDate + wages).ToString("C"))
lstOutput.Items.Add("FICA tax deduction: " &
(emp.FICA).ToString("C"))
lstOutput.Items.Add("Withholding tax deduction: " &
(emp.Withholding).ToString("C"))
lstOutput.Items.Add("Take-home pay: " & takeHome.ToString("C"))
End Sub
End Class
'frmPayroll
Class Employee
'Member variables hold property values
Private m_hours As Decimal
Private m_salary As Decimal
Dim tax As New Tax()
'Represents the tax for this employee
Public Property Name() As String
Public Property Hours() As Decimal
Get
Return m_hours
End Get
Set(Value As Decimal)
m_hours = Value
'Update the tax property also
tax.Wages = CDec(m_hours * m_salary)
End Set
End Property
Public Property Salary() As Decimal
Get
Return m_salary
End Get
Set(Value As Decimal)
m_salary = Value
'Update the tax property also
tax.Wages = CDec(m_hours * m_salary)
End Set
End Property
Public Property YearToDate() As Decimal
Get
'Return the tax property
Return tax.YearToDate
End Get
Set(Value As Decimal)
'Update the tax property
tax.YearToDate = Value
End Set
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 412 of 443)
Public Property Withhold() As Integer
Get
'Return the tax property
Return tax.Withhold
End Get
Set(Value As Integer)
'Update the tax property
tax.Withhold = Value
End Set
End Property
Public Property Married() As Boolean
Get
'Return the tax property
Return tax.Married
End Get
Set(Value As Boolean)
'Update the tax property
tax.Married = Value
End Set
End Property
Function FICA() As Decimal
'Return the tax property
Return tax.FICA
End Function
Function Withholding() As Decimal
'Return the tax property
Return tax.Withholding
End Function
End Class
'Employee
Class Tax
Public Property Wages() As Decimal
Public Property YearToDate() As Decimal
Public Property Withhold() As Integer
Public Property Married() As Boolean
Function FICA() As Decimal
'Calculate 2015 social security benefits tax and medicare tax
'for a single employee
Const WAGE_BASE As Decimal = 118500D
'There is no social
'security benefits tax on income above this level.
Const SOCIAL_SECURITY_RATE As Decimal = 0.062D
Const MEDICARE_RATE As Decimal = 0.0145D
Dim totalEarnings As Decimal
Dim socialSecurityBenTax, medicareTax As Decimal
'ytdEarnings = CDec(txtToDate.Text)
'curEarnings = CDec(txtCurrent.Text)
totalEarnings = YearToDate + Wages
'Calculate the Social Security Benefits tax.
If totalEarnings <= WAGE_BASE Then
socialSecurityBenTax = SOCIAL_SECURITY_RATE * Wages
ElseIf YearToDate < WAGE_BASE Then
socialSecurityBenTax = SOCIAL_SECURITY_RATE *
(WAGE_BASE - YearToDate)
End If
'Calculate the FICA tax.
medicareTax = MEDICARE_RATE * Wages
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 413 of 443)
If (Not Married) And YearToDate >= 200000D Then
medicareTax += 0.009D * (totalEarnings - 200000D)
End If
If Married And YearToDate > 250000 Then
medicareTax += 0.009D * (totalEarnings - 250000D)
End If
Return socialSecurityBenTax + medicareTax
End Function
Function Withholding() As Decimal
Dim adjPay As Decimal
'Subtract exemptions from wages
adjPay = CDec(Wages - (73.08 * Withhold))
'Branch depending upon status
If Married Then
Select Case adjPay
Case 0 To 165
Return 0
Case 165 To 520
Return 0.1D * (adjPay - 165)
Case 520 To 1606
Return 35.5D + 0.15D * (adjPay - 520)
Case 1606 To 3073
Return 198.4D + 0.25D * (adjPay - 1606)
Case 3073 To 4597
Return 565.15D + 0.28D * (adjPay - 3073)
Case 4597 To 8079
Return 991.87D + 0.33D * (adjPay - 4597)
Case 8079 To 9105
Return 2140.32D + 0.35D * (adjPay - 8079)
Case Is > 9105
Return 2500.03D + 0.396D * (adjPay - 9105)
End Select
Else
'Withholding table for single earners
Select Case adjPay
Case 0 To 44
Return 0
Case 44 To 222
Return (0.1D * (adjPay - 44))
Case 222 To 764
Return 17.8D + 0.15D * (adjPay - 222)
Case 764 To 1789
Return 99.1D + 0.25D * (adjPay - 764)
Case 1789 To 3685
Return 355.35D + 0.28D * (adjPay - 1789)
Case 3685 To 7958
Return 886.23D + 0.33D * (adjPay - 3685)
Case 7958 To 7990
Return 2296.32D + 0.35D * (adjPay - 3685)
Case Is > 7958
Return 2307.52D + 0.396D * (adjPay - 7958)
End Select
End If
End Function
End Class
'Tax
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 414 of 443)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 415 of 443)
14. Public Class frmPurchases
Dim purchases(49) As Purchase
Dim numberOfPurchase As Integer = -1
Dim totalCost As Decimal = 0
Private Sub btnRecord_Click(...) Handles btnRecord.Click
numberOfPurchase += 1
purchases(numberOfPurchase) = New Purchase
purchases(numberOfPurchase).Description = txtArticle.Text
purchases(numberOfPurchase).Quantity = CInt(txtQuantity.Text)
purchases(numberOfPurchase).PricePerItem = CDec(txtPrice.Text)
totalCost += purchases(numberOfPurchase).Quantity *
purchases(numberOfPurchase).PricePerItem
txtArticle.Clear()
txtQuantity.Clear()
txtPrice.Clear()
End Sub
Private Sub btnCreateReceipt_Click(...) Handles btnCreateReceipt.Click
lstReceipt.Items.Clear()
Dim cost As Decimal
For i = 0 To numberOfPurchase
cost = purchases(i).Quantity * purchases(i).PricePerItem
If purchases(i).Quantity = 1 Then
lstReceipt.Items.Add(1 & " " & purchases(i).Description &
" " & cost.ToString("C2"))
Else
lstReceipt.Items.Add(purchases(i).Quantity & " " &
purchases(i).Description & "s " & cost.ToString("C2"))
End If
Next
lstReceipt.Items.Add("Total Cost: " & totalCost.ToString("C2"))
End Sub
End Class
'frmPurchases
Class Purchase
Public Property Description() As String
Public Property Quantity() As Integer
Public Property PricePerItem() As Decimal
Function Cost() As Decimal
Return Quantity * PricePerItem
End Function
End Class
'Purchase
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 416 of 443)
EXERCISES 11.3
1. 4
2. 8
3. 64
4. 8
5. Can move Has jointed limbs and no backbone
6. Can move Has a backbone
7. The keyword Overrides should be Inherits.
8. The class Greetings should inherit the class Hello, not the function Hi().
9. The Hi function should be declared with the Overridable keyword in class Hello and with the
keyword Overrides keyword in class Aussie.
10. The Hi function should be declared with the Overridable keyword in class Hello.
11. The Hi function should be declared with the Overrides keyword in class Cowboy.
12. The MustOverride keyword should be replaced with Overridable.
13. The Hello class should be declared with the MustInherit keyword, and the function Hi
should be declared with the MustOverride keyword.
14. The Hello class should be declared with the MustInherit keyword.
15. The Hello class should be declared with the MustInherit keyword, not MustOverride.
16. The function Hi in the NorthEasterner class may not take a parameter.
17. Public Class frmCalculator
'Create the machines
Dim adder As New AddingMachine()
Dim calc As New Calculator()
Dim sci As New ScientificCalculator()
Private Sub radAddingMachine_CheckedChanged(...) Handles _
radAddingMachine.CheckedChanged
'Hide the multiply, divide and exponentiation
'functionality if checked
If radAddingMachine.Checked Then
btnMultiply.Visible = False
btnDivide.Visible = False
btnExponentiation.Visible = False
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 417 of 443)
Private Sub radCalculator_CheckedChanged(...) Handles _
radCalculator.CheckedChanged
'Show the multiply and divide functionality,
'hide the exponentiation if checked
If radCalculator.Checked Then
btnMultiply.Visible = True
btnDivide.Visible = True
btnExponentiation.Visible = False
End If
End Sub
Private Sub radScientific_CheckedChanged(...) Handles _
radScientific.CheckedChanged
'Show the multiply, divide and exponentiation
'functionality if checked
If radScientific.Checked Then
btnMultiply.Visible = True
btnDivide.Visible = True
btnExponentiation.Visible = True
End If
End Sub
Private Sub btnAdd_Click(...) Handles btnAdd.Click
If radAddingMachine.Checked Then
'If adding machine selected, use it to get the result
adder.num1 = CDbl(txtNumber1.Text)
adder.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(adder.Add())
ElseIf radCalculator.Checked Then
'If calculator selected, use it to get the result
calc.num1 = CDbl(txtNumber1.Text)
calc.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(calc.Add())
Else
'If scientific calculator selected, use it to get the result
sci.num1 = CDbl(txtNumber1.Text)
sci.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(sci.Add())
End If
End Sub
Private Sub btnSubtract_Click(...) Handles btnSubtract.Click
If radAddingMachine.Checked Then
'If adding machine selected, use it to get the result
adder.num1 = CDbl(txtNumber1.Text)
adder.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(adder.Subtract())
ElseIf radCalculator.Checked Then
'If calculator selected, use it to get the result
calc.num1 = CDbl(txtNumber1.Text)
calc.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(calc.Subtract())
Else
'If scientific calculator selected, use it to get the result
sci.num1 = CDbl(txtNumber1.Text)
sci.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(sci.Subtract())
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 418 of 443)
Private Sub btnMultiply_Click(...) Handles btnMultiply.Click
If radCalculator.Checked Then
'If calculator selected, use it to get the result.
calc.num1 = CDbl(txtNumber1.Text)
calc.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(calc.Multiply())
Else
'If scientific calculator selected, use it to get the result.
sci.num1 = CDbl(txtNumber1.Text)
sci.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(sci.Multiply())
End If
End Sub
Private Sub btnDivide_Click(...) Handles btnDivide.Click
If radCalculator.Checked Then
'If calculator selected, use it to get the result.
calc.num1 = CDbl(txtNumber1.Text)
calc.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(calc.Divide())
Else
'If scientific calculator selected, use it to get the result
sci.num1 = CDbl(txtNumber1.Text)
sci.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(sci.Divide())
End If
End Sub
Private Sub btnExponentiation_Click(...) Handles _
btnExponentiation.Click
sci.num1 = CDbl(txtNumber1.Text)
sci.num2 = CDbl(txtNumber2.Text)
txtResult.Text = CStr(sci.Exponentiation())
End Sub
End Class
'frmCalculator
Class AddingMachine
Property num1() As Double
Property num2() As Double
Function Add() As Double
Return num1 + num2
End Function
Function Subtract() As Double
Return num1 - num2
End Function
End Class
'AddingMachine
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 419 of 443)
Class Calculator
Inherits AddingMachine
'Calculator inherits properties num1 and num2
'and functions add() and subtract().
Function Multiply() As Double
Return num1 * num2
End Function
Function Divide() As Double
Return num1 / num2
End Function
End Class
'Calculator
Class ScientificCalculator
Inherits Calculator
'ScientificCalculator inherits properties num1 and num2
'and methods Add(), Subtract(), Multiply, and Divide.
Function Exponentiation() As Double
'Raise the first number by the second
Return num1 ^ num2
End Function
End Class
'ScientificCalculator
18. Public Class frmGrades
Dim students(49) As Student
'Stores the class
Dim lastStudentAdded As Integer = -1 'Last student added to Students
Private Sub btnEnter_Click(...) Handles btnEnter.Click
Dim pupil As Student
'Create the appropriate object depending upon the radio button
If rdoPassFail.Checked Then
pupil = New PFStudent()
Else
pupil = New LGStudent()
End If
'Store the values in the text boxes into the object
pupil.Name = txtName.Text
pupil.SocSecNum = mtbSSN.Text
pupil.Midterm = CDbl(txtMidterm.Text)
pupil.Final = CDbl(txtFinal.Text)
'Add the student to the array
lastStudentAdded += 1
students(lastStudentAdded) = pupil
'Clear text boxes and list box
txtName.Clear()
mtbSSN.Clear()
txtMidterm.Clear()
txtFinal.Clear()
MessageBox.Show("Student #" & lastStudentAdded + 1 & " recorded.")
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 420 of 443)
Private Sub btnDisplay_Click(...) Handles btnDisplay.Click
ReDim Preserve students(lastStudentAdded)
Dim query = From pupil In students
Select pupil.Name, pupil.SocSecNum, pupil.CalcSemGrade
dgvGrades.DataSource = query.ToList
dgvGrades.CurrentCell = Nothing
dgvGrades.Columns("Name").HeaderText = "Student Name"
dgvGrades.Columns("SocSecNum").HeaderText = "SSN"
dgvGrades.Columns("CalcSemGrade").HeaderText = "Grade"
ReDim Preserve students(50)
txtName.Focus()
End Sub
Private Sub btnQuit_Click(...) Handles btnQuit.Click
Me.Close()
End Sub
End Class
'frmGrades
MustInherit Class Student
Public Property Name() As String
Public Property SocSecNum() As String
Public Property Midterm() As Double
Public Property Final() As Double
'Child classes must override this function
MustOverride Function CalcSemGrade() As String
End Class
'Student
Class LGStudent
Inherits Student
Overrides Function CalcSemGrade() As String
Dim grade As Double
grade = (Midterm + Final) / 2
grade = Math.Round(grade) 'Round the grade
Select Case grade
Case Is >= 90
Return "A"
Case Is >= 80
Return "B"
Case Is >= 70
Return "C"
Case Is >= 60
Return "D"
Case Else
Return "F"
End Select
End Function
End Class
'LGStudent
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 421 of 443)
Class PFStudent
Inherits Student
Overrides Function CalcSemGrade() As String
Dim grade As Double
'The grade is based upon average of the midterm and final exams
grade = (Midterm + Final) / 2
grade = Math.Round(grade) 'Round the grade
If grade >= 60 Then
Return "Pass"
Else
Return "Fail"
End If
End Function
End Class
'PFStudent
19. Public Class frmRegister
Dim tollBooth As New FastTrackRegister()
Private Sub btnProcess_Click(...) Handles btnProcess.Click
If radCar.Checked Then
tollBooth.ProcessCar()
Else
tollBooth.ProcessTruck()
End If
txtRevenue.Text = (tollBooth.Balance).ToString("C")
txtNumVehicles.Text = CStr(tollBooth.Count)
End Sub
End Class
'frmRegister
Class CashRegister
Private m_balance As Decimal
Sub Deposit(amount As Decimal)
m_balance += amount
End Sub
Sub WithDrawal(amount As Decimal)
m_balance = m_balance - amount
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 422 of 443)
Public ReadOnly Property Balance() As Decimal
Get
Return m_balance
End Get
End Property
End Class
'CashRegister
Class FastTrackRegister
Inherits CashRegister
Private m_count As Integer
Public ReadOnly Property Count() As Integer
Get
Return m_count
End Get
End Property
Sub ProcessCar()
m_count += 1
'Process a car: $1.00
Deposit(1)
End Sub
Sub ProcessTruck()
m_count += 1
'Process a truck: $2.00
Deposit(2)
End Sub
End Class
'FastTrackRegister
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 423 of 443)
20. Public Class frmGrades
Dim WithEvents data As New CompleteStats()
Private Sub btnRecord_Click(...) Handles btnRecord.Click
'Add the grade to the statistics
data.AddNumber(CInt(txtGrade.Text))
'Update the count
txtCount.Text = CStr(data.Count)
'Clear the input for the next grade
txtGrade.Clear()
txtGrade.Focus()
End Sub
Private Sub btnAverage_Click(...) Handles btnAverage.Click
'Display the average grade
txtAverage.Text = (data.Average).ToString("N")
End Sub
Sub Spread(spread As Integer) Handles data.NewSpread
'Display the new spread
txtSpread.Text = CStr(spread)
End Sub
End Class
'frmGrades
Class Statistics
Private m_numbers(50) As Integer
Private m_count As Integer
'Count of numbers entered into array
Overridable Sub AddNumber(number As Integer)
'Adds a number to the array
m_count += 1
m_numbers(m_count) = number
End Sub
Public ReadOnly Property Count() As Integer
Get
Return m_count
End Get
End Property
Function Average() As Double
'Computes the average
Dim sum As Integer = 0
For i As Integer = 1 To m_count
sum += m_numbers(i)
Next
Return sum / m_count
End Function
End Class
'Statistics
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 424 of 443)
Class CompleteStats
Inherits Statistics
Private m_min As Integer = 100 'Current minimum
Private m_max As Integer = 0
'Current maximum
Public Event NewSpread(spread As Integer) 'Raised for a new spread
Overrides Sub AddNumber(number As Integer)
MyBase.AddNumber(number)
If number < m_min Then
'If new number is less than current minimum then raise the event
m_min = number
RaiseEvent NewSpread(Spread())
End If
If number > m_max Then
'If new number is more than current maximum then raise the event
m_max = number
RaiseEvent NewSpread(Spread())
End If
End Sub
Function Spread() As Integer
'Returns the difference between maximum and minimum
Return m_max - m_min
End Function
End Class
'CompleteStats
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 425 of 443)
21. Public Class frmBookstore
Dim books(10) As Book
Dim count As Integer
'Stores books
'Last stored book
Private Sub btnOrder_Click(...) Handles btnOrder.Click
'Create appropriate book object
Dim book As Book
If radTextbook.Checked Then
book = New Textbook()
Else
book = New Tradebook()
End If
'Store the values into the book object
book.Name = txtName.Text
book.Cost = CDec(txtCost.Text)
book.Quantity = CInt(txtQuantity.Text)
'Increment counter and store book into array
books(count) = book
count += 1
'Reset input fields and focus on the quantity
txtName.Clear()
txtCost.Clear()
txtQuantity.Text = ""
txtQuantity.Focus()
End Sub
Private Sub btnInventory_Click(...) Handles btnInventory.Click
'Display inventory of books
Dim num As Integer = 0
Dim textb As Integer = 0
Dim cost As Decimal = 0
Dim value As Decimal = 0
'Aggregate totals
For i As Integer = 0 To (count – 1)
cost += books(i).Quantity * books(i).Cost
value += books(i).Quantity * books(i).Price
num += books(i).Quantity
'Count textbooks
If TypeOf books(i) Is Textbook Then
textb += books(i).Quantity
End If
Next
'Display totals
lstInventory.Items.Clear()
lstInventory.Items.Add("Total cost: " & cost.ToString("C"))
lstInventory.Items.Add("Total value: " & value.ToString("C"))
lstInventory.Items.Add("Number of books: " & num)
lstInventory.Items.Add("Number of textbooks: " & textb)
End Sub
End Class
'frmBookstore
MustInherit Class Book
Public Property Name() As String
Public Property Cost() As Decimal
Public Property Quantity() As Integer
'Children must override this property
MustOverride ReadOnly Property Price() As Decimal
End Class
'Book
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 426 of 443)
Class Tradebook
Inherits Book
Overrides ReadOnly Property Price() As Decimal
Get
Return 1.4D * Cost
'40% markup
End Get
End Property
End Class
'Tradebook
Class Textbook
Inherits Book
Overrides ReadOnly Property Price() As Decimal
Get
Return 1.2D * Cost
'20% markup
End Get
End Property
End Class
'Textbook
22. Public Class frmPayroll
'Holds the employee data and number of hours worked
Structure Payroll
Dim Employee As Employee
'Employee object
Dim Hours As Double
'Hours worked during the week
End Structure
Dim pay(10) As Payroll
Dim count As Integer
'Holds payroll records
'Last recorded employee
Private Sub btnRecord_Click(...) Handles btnRecord.Click
'Record an employee into the payroll
Dim employee As Employee
'Determine employee type
If radSalaried.Checked Then
employee = New Salaried()
Else
employee = New Hourly()
End If
'Store the data
into the object
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 427 of 443)
employee.Name = txtName.Text
employee.Rate = CDec(txtRate.Text)
'Store the employee and hours into the structure array
pay(count).Employee = employee
pay(count).Hours = CDbl(txtHours.Text)
count += 1
'Clear the input and set focus to name for the next employee
txtName.Clear()
txtRate.Clear()
txtHours.Clear()
txtName.Focus()
End Sub
Private Sub btnPayroll_Click(...) Handles btnPayroll.Click
'Display the statistics
Dim hrs As Double
'Aggregate totals
Dim sal As Integer = 0
Dim payroll As Decimal = 0
For i As Integer = 0 To (count – 1)
If TypeOf pay(i).Employee Is Salaried Then
sal += 1
End If
payroll += pay(i).Employee.GrossPay(pay(i).Hours)
hrs += pay(i).Hours
Next
lstPayroll.Items.Clear()
lstPayroll.Items.Add("Number of employees: " & CStr(count))
lstPayroll.Items.Add("Salaried employees: " & CStr(sal))
lstPayroll.Items.Add("Total payroll: " & payroll.ToString("C"))
lstPayroll.Items.Add("Average hours worked: " &
(hrs / count).ToString("N1"))
End Sub
End Class
'frmPayroll
Public MustInherit Class Employee
Public Property Name() As String
Public Property Rate() As Decimal
'Children must override this function to return gross pay
MustOverride Function GrossPay(hours As Double) As Decimal
End Class
'Employee
Class Salaried
Inherits Employee
Overrides Function GrossPay(hours As Double) As Decimal
'Disregard hours worked; pay is simply the weekly salary
Return Rate
End Function
End Class
'Salaried
Class Hourly
Inherits Employee
Overrides Function GrossPay(hours As Double) As Decimal
'Multiply hours worked by rate
Return CDec(hours * Rate)
End Function
End Class
'Hourly
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 428 of 443)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 429 of 443)
23. Public Class frmInterestOnlyMortgage
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim loan As New InterestOnlyMortgage
loan.Principal = CDec(txtPrincipal.Text)
loan.InterestRate = CDec(txtInterestRate.Text)
loan.Years = CInt(txtYears.Text) - CInt(txtInterestOnlyYears.Text)
loan.InterestOnlyYears = CInt(txtInterestOnlyYears.Text)
txtMonthlyPayment1.Text =
(loan.calculateInitialMonthlyPayment).ToString("C2")
txtMonthlyPayment2.Text =
(loan.calculateMonthlyPayment).ToString("C2")
End Sub
End Class
'frmInterestOnlyMortgage
Class Mortgage
Private m_years As Integer
Public Property Principal() As Decimal
Public Property InterestRate() As Decimal
Public WriteOnly Property Years() As Integer
Set(value As Integer)
m_years = value
End Set
End Property
Function calculateMonthlyPayment() As Decimal
Dim i As Decimal
i = _InterestRate / 1200
Return ((i / (1 - ((1 + i) ^ (-12 * m_years)))) * _Principal)
End Function
End Class
'Mortgage
Class InterestOnlyMortgage
Inherits Mortgage
Private m_numberOfInterestOnlyYears As Integer
Public WriteOnly Property InterestOnlyYears() As Integer
Set(value As Integer)
m_numberOfInterestOnlyYears = value
End Set
End Property
Function calculateInitialMonthlyPayment() As Decimal
Return CDec(Principal * InterestRate / 1200)
End Function
End Class
'InterestOnlyMortgage
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 430 of 443)
24. Public Class frmMortgageWithPoints
Private Sub btnCalculate_Click(...) Handles btnCalculate.Click
Dim loan As New MortgageWithPoints
loan.Principal = CDec(txtPrincipal.Text)
loan.InterestRate = CDec(txtInterestRate.Text)
loan.Years = CInt(txtYears.Text)
loan.NumberOfPoints = CInt(txtPoints.Text)
txtCostOfPoints.Text = (loan.calculateCostOfPoints).ToString("C2")
txtMonthlyPayment.Text = (loan.calculateMonthlyPayment).ToString("C2")
End Sub
End Class
'frmMortgageWithPoints
Class Mortgage
Private m_years As Integer
Public Property Principal() As Decimal
Public Property InterestRate() As Decimal
Public WriteOnly Property Years() As Integer
Set(value As Integer)
m_years = value
End Set
Function calculateMonthlyPayment() As Decimal
Dim i As Decimal
i = _InterestRate / 1200
Return ((i / (1 - ((1 + i) ^ (-12 * m_years)))) * _Principal)
End Function
End Class
'Mortgage
Class MortgageWithPoints
Inherits Mortgage
Private m_numberOfPoints As Integer
Public WriteOnly Property NumberOfPoints() As Integer
Set(value As Integer)
m_numberOfPoints = value
End Set
End Property
Function calculateCostOfPoints() As Decimal
Return CDec(Principal * m_numberOfPoints / 100)
End Function
End Class
'MortgageWithPoints
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 431 of 443)
CHAPTER 11 PROGRAMMING PROJECTS
1. Public Class frmBank
'Create checking and savings accounts.
Dim WithEvents checking As New Account("Checking")
Dim WithEvents savings As New Account("Savings")
Dim check As Boolean
'True if current mode is Checking
Dim committed As Boolean
'True if transaction was committed
Dim curDate As Date
'Current date
Structure Trans
Dim dt As Date
Dim nom As String
Dim newBal As Decimal
Dim amt As Decimal
Dim cred As Boolean
End Structure
Dim sav() As Trans
Dim chk() As Trans
Private Sub frmBank_Load(...) Handles MyBase.Load
'Setup user interface for Checking.
'Load the transactions from the data files.
checking.Load()
savings.Load()
'Select checking account as account to transfer from.
cboTransfer.SelectedIndex = 0
'Select checking account as the first account to see.
cboAccount.SelectedIndex = 0
txtDate.Text = CStr(Today)
'Today's date
UpdateGrid()
End Sub
Sub UpdateGrid()
Dim temp() As String
If cboAccount.SelectedIndex = 0 Then
temp = IO.File.ReadAllLines("Checking.txt")
Else
temp = IO.File.ReadAllLines("Savings.txt")
End If
Dim n = temp.Count - 1
Dim data() As String
ReDim sav(n)
For i As Integer = 0 To n
Dim preBal As Decimal = 0
data = temp(i).Split(","c)
sav(i).dt = CDate(data(0))
sav(i).nom = data(1)
sav(i).amt = CDec(data(2))
If i = 0 Then
preBal = 0
Else
preBal = sav(i - 1).newBal
End If
If CBool(data(3)) Then
sav(i).newBal = preBal + sav(i).amt
Else
sav(i).newBal = preBal - sav(i).amt
End If
Next
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 432 of 443)
Dim query = From s In sav
Let amt = (s.amt).ToString("C")
Let newBal = (s.newBal).ToString("C")
Select s.dt, s.nom, amt, newBal
dgvTransactions.DataSource = query.ToList
dgvTransactions.CurrentCell = Nothing
dgvTransactions.Columns("dt").HeaderText = "Date"
dgvTransactions.Columns("nom").HeaderText = "Type of Transaction"
dgvTransactions.Columns("amt").HeaderText = "Amount"
dgvTransactions.Columns("newBal").HeaderText = "New Balance"
End Sub
Sub Insufficient(over As Decimal) Handles _
checking.Insufficient, savings.Insufficient
'If insufficient funds, set the committed flag to false and display message
committed = False
MessageBox.Show("Insufficient Funds: " & over.ToString("C"),
"Insufficient Funds")
End Sub
Sub TransactionCommitted() Handles checking.TransactionCommitted,
savings.TransactionCommitted
'If transaction committed, set the committed flag to True
committed = True
End Sub
Private Sub cboAccount_SelectedIndexChanged(...) Handles _
cboAccount.SelectedIndexChanged
'Show the check group box if checking is enabled
check = (cboAccount.SelectedIndex = 0)
grpCheck.Visible = check
Display() 'Display the transactions for the account
UpdateGrid()
End Sub
Sub Display()
'Display the transactions belonging to the account
If check Then
'Display the transactions in the lstTransactions list box
'checking.EnumerateTransactions(lstTransactions)
'Display the balance in the text box
txtBalance.Text = (checking.Balance).ToString("C")
Else
'Display the transactions in the lstTransactions list box
'savings.EnumerateTransactions(lstTransactions)
'Display the balance in the text box
txtBalance.Text = (savings.Balance).ToString("C")
End If
UpdateGrid()
End Sub
Private Sub btnDeposit_Click(...) Handles btnDeposit.Click
'Deposit an amount into an account
Dim trans As Transaction
'Create new deposit transaction
curDate = CDate(txtDate.Text)
trans = New Transaction(curDate, "Deposit", CDec(txtDeposit.Text), True)
'Store transaction and update display
If check Then
checking.Add(trans)
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 433 of 443)
Dim sw As IO.StreamWriter = IO.File.AppendText("CHECKING.TXT")
sw.WriteLine(trans.Format)
sw.Close()
Else
savings.Add(trans)
Dim sw As IO.StreamWriter = IO.File.AppendText("SAVINGS.TXT")
sw.WriteLine(trans.Format)
sw.Close()
End If
'Display new transaction
Display()
txtDeposit.Clear()
End Sub
Private Sub btnWithdrawal_Click(...) Handles btnWithdrawal.Click
'Withdrawal an amount from an account
Dim trans As Transaction
'Create new deposit transaction
curDate = CDate(txtDate.Text)
trans = New Transaction(curDate, "Withdrawal",
CDec(txtWithdrawal.Text), False)
'Store transaction and update display
If check Then
checking.Add(trans)
If committed Then
Dim sw As IO.StreamWriter = IO.File.AppendText("CHECKING.TXT")
sw.WriteLine(trans.Format)
sw.Close()
End If
Else
savings.Add(trans)
If committed Then
Dim sw As IO.StreamWriter = IO.File.AppendText("SAVINGS.TXT")
sw.WriteLine(trans.Format)
sw.Close()
End If
End If
'Display new transaction
Display()
txtWithdrawal.Clear()
End Sub
Private Sub btnCheck_Click(...) Handles btnCheck.Click
'Withdrawal an amount from an account.
Dim trans As Transaction
'Create new deposit transaction
curDate = CDate(txtDate.Text)
trans = New Transaction(curDate, "Check cashed by " & txtCheckTo.Text,
CDec(txtCheck.Text), False)
'Store transaction, and update display.
checking.Add(trans)
If committed Then
Dim sw As IO.StreamWriter = IO.File.AppendText("CHECKING.TXT")
sw.WriteLine(trans.Format)
sw.Close()
End If
Display()
txtCheck.Clear()
txtCheckTo.Clear()
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 434 of 443)
Private Sub cboTransfer_SelectedIndexChanged(...) Handles _
cboTransfer.SelectedIndexChanged
'Display the proper account label caption.
If cboTransfer.SelectedIndex = 0 Then
lblTransferTo.Text = "to Savings"
Else
lblTransferTo.Text = "to Checking"
End If
End Sub
Private Sub btnTransfer_Click(...) Handles btnTransfer.Click
'Transfer money from one account to the other.
Dim trans As Transaction
Dim amount As Decimal = CDec(txtTransfer.Text)
curDate = CDate(txtDate.Text)
'Create new withdrawal transaction.
committed = True
If cboTransfer.SelectedIndex = 0 Then
'Store transaction from checking account.
trans = New Transaction(curDate, "Transfer to Savings", amount, False)
checking.Add(trans)
If committed Then
Dim sw As IO.StreamWriter = IO.File.AppendText("Checking.txt")
sw.WriteLine(trans.Format)
sw.Close()
End If
Else
'Store transaction from savings account.
trans = New Transaction(curDate, "Transfer to Checking", amount, False)
savings.Add(trans)
If committed Then
Dim sw As IO.StreamWriter = IO.File.AppendText("Savings.txt")
sw.WriteLine(trans.Format)
sw.Close()
End If
End If
'Deposit to other account only if last transaction was committed.
If committed Then
If cboTransfer.SelectedIndex = 0 Then
'Store transaction to savings
trans = New Transaction(curDate, "Transfer from Checking",
amount, True)
savings.Add(trans)
Dim sw As IO.StreamWriter = IO.File.AppendText("Savings.txt")
sw.WriteLine(trans.Format)
sw.Close()
Else
'Store transaction to checking account.
trans = New Transaction(curDate, "Transfer from Savings", amount, True)
checking.Add(trans)
Dim sw As IO.StreamWriter = IO.File.AppendText("Checking.txt")
sw.WriteLine(trans.Format)
sw.Close()
End If
'Display transactions.
Display()
txtTransfer.Clear()
End If
End Sub
End Class
'frmBank
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 435 of 443)
Class Transaction
Private m_name As String
Private m_amount As Decimal
Private m_date As Date
Private m_credit As Boolean
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
Public ReadOnly Property Amount() As Decimal
Get
Return m_amount
End Get
End Property
Public ReadOnly Property TransDate() As Date
Get
Return m_date
End Get
End Property
Public ReadOnly Property Credit() As Boolean
Get
Return m_credit
End Get
End Property
Public Sub New(dt As Date, nm As String,
amt As Decimal, cred As Boolean)
'Create new transaction object.
'Store parameters into member variables.
m_name = nm
m_amount = amt
m_credit = cred
m_date = dt
End Sub
Function Format() As String
'Put information into the proper form for insertion
'into one of the two text files
Return CStr(TransDate) & "," & Name & "," & CStr(Amount) &
"," & CStr(Credit)
End Function
End Class
'Transaction
Class Account
Dim trans(50) As Transaction
Dim lastNum As Integer
Private m_name As String
Private m_balance As Decimal
'Holds the transactions
'Last transaction stored
'Name of the account
'Current balance
Public ReadOnly Property Name() As String
Get
Return m_name
End Get
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 436 of 443)
Public ReadOnly Property Balance() As Decimal
Get
Return m_balance
End Get
End Property
'Insufficient event is raised when a withdrawal is more than the balance.
Public Event Insufficient(over As Decimal)
Public Event TransactionCommitted()
Public Sub New(name As String)
'Store the name
m_name = name
End Sub
Sub Add(transaction As Transaction)
'Add a transaction to the account.
Dim newBalance As Decimal
'Calculate new balance.
If transaction.Credit Then
newBalance = Balance + transaction.Amount
Else
newBalance = Balance - transaction.Amount
End If
'If new balance is negative, then raise the insufficient event.
If newBalance < 0 Then
RaiseEvent Insufficient(newBalance)
Else
lastNum += 1
'Ensure there is space to store the transaction within the array.
If (trans.Count – 1) <= lastNum Then
ReDim Preserve trans(lastNum + 5)
End If
'Store the tranasction, new balance, and raise the committed event.
trans(lastNum) = transaction
m_balance = newBalance
RaiseEvent TransactionCommitted()
End If
End Sub
Sub Load()
'Load the data from a comma separated value (CSV) text file
Dim fileName As String = m_name & ".TXT"
Dim sr As IO.StreamReader
Dim data() As String 'Array to receive values of Split function.
Dim trans As Transaction
'Only load account if file exists
If IO.File.Exists(fileName) Then
sr = IO.File.OpenText(fileName)
'Loop through all lines of the file
While Not sr.EndOfStream
'Split the line of data on commas into the string array data().
data = sr.ReadLine.Split(","c)
'Add the transaction to the account.
trans = New Transaction(CDate(data(0)), data(1),
CDec(data(2)), CBool(data(3)))
Add(trans)
End While
sr.Close()
End If
End Sub
End Class
'Account
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 437 of 443)
2. Public Class frmBlackJack
Dim player, dealer As Hand
'The two hands
Dim WithEvents deck As DeckOfCards
'The deck of cards
Private Sub frmBlackJack_Load(...) Handles MyBase.Load
'Instantiate hands and deck.
player = New Hand()
dealer = New Hand()
deck = New DeckOfCards()
'Deal the first hand
NewHand()
txtOutput.Clear()
End Sub
Private Sub btnNewHand_Click(...) Handles btnNewHand.Click
'Only deal a new hand if the hand is not finished
If dealer.LastStored <> 1 Then
NewHand()
End If
End Sub
Private Sub btnHold_Click(...) Handles btnHold.Click
'Only stay if not stayed before and player has not busted yet
If (player.Score <= 21) And (dealer.LastStored = 1) Then
Hold()
End If
End Sub
Private Sub btnHit_Click(...) Handles btnHit.Click
'Only hit if player has less than 5 cards, has not yet bust and not held
If (player.LastStored < 5) And (player.Score < 21) And
(dealer.LastStored = 1) Then
Deal_Player()
End If
'If reached 5 cards or busted then the player must hold
If (player.LastStored = 5) Or (player.Score > 21) Then
Hold()
End If
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 438 of 443)
Sub NewHand()
'Reset hands and result.
player.Clear()
dealer.Clear()
lstPlayer.Items.Clear()
lstDealer.Items.Clear()
txtPlayer.Clear()
txtDealer.Clear()
txtOutput.Clear()
'Shuffle the deck.
deck.ShuffleDeck()
'Deal one card to dealer and two cards to player
Deal_Dealer()
Deal_Player()
Deal_Player()
End Sub
Sub Deal_Player()
'Deal one card to player.
Dim card As Card
card = deck.Deal()
player.Deal(card)
'Display card and score in appropriate list boxes
lstPlayer.Items.Add(card.IdentifyCard)
txtPlayer.Text = CStr(player.Score)
End Sub
Sub Deal_Dealer()
'Deal one card to dealer.
Dim card As Card
card = deck.Deal()
dealer.Deal(card)
'Display card and score in appropriate list boxes
lstDealer.Items.Add(card.IdentifyCard)
txtDealer.Text = CStr(dealer.Score)
End Sub
Sub Hold()
'Deal one card to dealer until number reaches 5 or score reaches 17.
'If player has busted, then just deal one more card.
Do
Deal_Dealer()
Loop Until (player.Score > 21) Or (dealer.LastStored = 5) Or
(dealer.Score > 16)
'Display the result of the hands.
txtOutput.Text = Result()
End Sub
Function Result() As String
'Determines the result of the hands
'If player or dealer busted
If player.Score > 21 Then
Return "You Busted - Dealer Wins"
End If
If dealer.Score > 21 Then
Return "Dealer Busted - You win"
End If
If player.LastStored = 5 Then
If dealer.LastStored = 5 Then
Return "Both hands reached 5 - Push"
End If
Return "Hand reached 5 - You win"
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 439 of 443)
End If
If dealer.LastStored = 5 Then
Return "Dealer hand reached 5 - Dealer Wins"
End If
'Compare scores
Select Case player.Score
Case Is > dealer.Score
Return "You win"
Case dealer.Score
Return "Push"
Case Else
Return "Dealer wins"
End Select
End Function
Private Sub cards_Shuffling(n As Integer,
nMax As Integer) Handles deck.Shuffling
'n is the number of the specific pass through the deck (1, 2, 3...).
'nMax is the total number of passes when the deck is shuffled.
txtOutput.Text = "Shuffling Pass: " & n & " out of " & nMax
For i As Integer = 1 To 1000000 'Slow down the shuffle.
Next
txtOutput.Update()
'Refresh contents of text box
End Sub
End Class
'frmBlackJack
Class Hand
Private cards(5) As Card
Private m_lastStored As Integer
'Maximum of 5 cards in a hand
'Location of last stored card
Public ReadOnly Property LastStored() As Integer
Get
Return m_lastStored
End Get
End Property
Public ReadOnly Property Card(i As Integer) As Card
Get
Return cards(i)
End Get
End Property
Public ReadOnly Property Score() As Integer
Get
Dim total As Integer
Dim Ace As Boolean = False
'Add up all of the cards' scores in the hand.
For i As Integer = 1 To m_lastStored
'Remember if there was an ace.
total += cards(i).Score
If cards(i).Denomination = 1 Then
Ace = True
End If
Next
'If ace in the hand and less than 12, then ace counts 11.
If (total < 12) And Ace Then
total += 10
End If
Return total
End Get
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 440 of 443)
Sub Deal(card As Card)
'Add the card to the hand.
If m_lastStored < 5 Then
'Increment counter, and store card in array.
m_lastStored += 1
cards(m_lastStored) = card
End If
End Sub
Sub Clear()
'Removeall cards from hand.
m_lastStored = 0
End Sub
End Class
'Hand
Class Card
Private m_Denomination As Integer
Private m_Suit As String
'A number from 1 through 13
'Hearts, Clubs, Diamonds, Spades
Public Property Denomination() As Integer
Get
Return m_Denomination
End Get
Set(Value As Integer)
'Only store valid values.
If (Value >= 1) And (Value <= 13) Then
m_Denomination = Value
End If
End Set
End Property
Public ReadOnly Property Score() As Integer
Get
'Jack, Queen and King count 10.
If m_Denomination > 10 Then
Return 10
Else
Return m_Denomination
End If
End Get
End Property
Public Property Suit() As String
Get
Return m_Suit
End Get
Set(Value As String)
'Only store valid values
If (Value = "Hearts") Or (Value = "Clubs") Or (Value = "Diamonds") Or
(Value = "Spades") Then
m_Suit = Value
End If
End Set
End Property
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 441 of 443)
Function IdentifyCard() As String
Dim Denom As String = ""
Select Case m_Denomination
Case 1
Denom = "Ace"
Case Is <= 10
Denom = CStr(m_Denomination)
Case 11
Denom = "Jack"
Case 12
Denom = "Queen"
Case 13
Denom = "King"
End Select
Return Denom & " of " & m_Suit
End Function
End Class
'Card
Class DeckOfCards
Private m_deck(52) As Card
'Deck of 52 Cards
Private m_dealt As Integer
'Last card dealt (1, 2, ..., 52)
'Shuffling event contains the current pass and total number of passes
Public Event Shuffling(n As Integer, nMax As Integer)
Public Sub New()
'Make the first thirteen cards hearts, the
'next thirteen cards diamonds, and so on.
Dim suits() As String = {"Hearts", "Diamonds", "Clubs", "Spades"}
For i As Integer = 0 To 3
For j As Integer = 1 To 13
'Assign numbers from 1 through 13 to the
'cards of each suit.
m_deck(i * 13 + j) = New Card()
m_deck(i * 13 + j).Suit = suits(i)
m_deck(i * 13 + j).Denomination = j
Next
Next
End Sub
Function Deal() As Card
'Increment counter, cycling to one.
If m_dealt < 52 Then
m_dealt += 1
Else
m_dealt = 1
End If
Return m_deck(m_dealt)
End Function
Sub Swap(i As Integer, j As Integer)
'Swap the ith and jth card in the deck
Dim tempCard As Card
tempCard = m_deck(i)
m_deck(i) = m_deck(j)
m_deck(j) = tempCard
End Sub
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 442 of 443)
Sub ShuffleDeck()
'Do 2000 passes through the deck. On each pass,
'swap each card with a randomly selected card.
Dim index As Integer
Dim randomNum As New Random()
For i As Integer = 1 To 2000
For k As Integer = 1 To 52
index = randomNum.Next(1, 53) 'Randomly select a number
'
from 1 through 52 inclusive
Swap(k, index)
Next
'Raise the shuffling event to track the progress of the shuffle.
RaiseEvent Shuffling(i, 2000)
Next
End Sub
End Class
'DeckOfCards
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.
Instructor Solutions Manual (Page 443 of 443)
Some Common Commands
(key1+key2 means “Hold down key1 while pressing key2.”)
(key1/key2 means “Release key1 before pressing key2.”)
Environment and Editor
Alt
Alt/File/New/Project (or Ctrl+Shift+N)
Alt/File/Open/”Project/Solution”
Alt/File/Save All (or Ctrl+Shift+S)
Alt/File Close Solution (or Project)
Alt/Window/Reset Window Layout
Alt/File/Exit (or Alt+F4)
Alt/View/Code (or F7)
Alt/View/Designer (or Shift+F7)
Alt/View/Solution Explorer
Alt/View/Full Screen (or Shift+Alt+Enter)
Alt/Project/Add New Item
Alt/Project/Add Existing Item
Ctrl+A
Ctrl+C
Ctrl+F
Ctrl+H
Ctrl+P
Ctrl+V
Ctrl+Z
Ctrl+Shift+Enter
F4
F5
F11
F10
Shift+F11
F9
Esc
Drag a window's title bar to center of screen
Toggle focus between Document window and Menu bar
Start a new program
Open an existing program (also Ctrl+Shift+O)
Save the current program
Close the current program
Reset to the IDE's default layout
Terminate execution of program or Visual Basic
Display the Code Editor for the current program
Display the Form Designer for the current program
Display the Solution Explorer window
Enlarge Visual Basic IDE screen
Add a new text file or form to a program
Import an existing text file or form into program
Select everything in the Form Designer or Code Editor
Place selected text into Clipboard
Find
Replace
Print a copy of the current program
Replace selected text with contents of Clipboard
Undo last change
Terminate entry of a query
Display the properties window for the selected control
Run the current program
Execute the next line of code while debugging
Execute the next line of code while debugging, but do
not follow execution through any procedure calls
Execute remainder of current procedure while debugging
Toggle a breakpoint
Close a menu or dialog box
Undock window for easier use (Hold down Ctrl key and
double-click on title bar to redock window)
Controls
Tab
Shift+Tab
Double-click on an obect
arrow key
Ctrl+arrow key
Shift+arrow key
Delete
Cycle forward through controls
Cycle backward through controls
Create a template for object's default event procedure
Move selected control in the Form Designer
Move selected control to align with another control
Resize selected control in the Form Designer
Remove the selected control
Toolbox
Click on upright push pin
Click on reclining push pin
Slide Toolbox into a tab at left side of the screen
Keep Toolbox permanently displayed
© 2017 Pearson Education, Inc., Hoboken, NJ. All rights reserved.