152111011 INTRODUCTION TO PROGRAMMING LAB
LAB WORK 7
Objectives:
 Functions with input parameters
 Start  Programs  Microsoft Visual Studio 2015
 File  New  Project
 Select Visual C#  Windows  Windows Forms Applications and write project name Lab07 at bottom.
1. Write a C# program that accepts three floating-point numbers as input parameters from textBoxes, finds the average
of these numbers, and displays the result in a label. In addition write a function that name of showaverage() to
calculate average of three numbers.
A sample run may be as follows;
2. Write a C# program that accepts an integer value as the time in seconds, and displays the time in hours, minutes and
seconds.
A sample run may be as follows:
1
3. Write a program that enters the a, b, and c coefficients of a second-degree polynomial
ax2 + bx + c, then compute and display its roots using the following below:

Use Math.Sqrt for square root of numbers
The two roots are defined as
 b  b 2  4ac
root1 =
2a
 b  b 2  4ac
root2 =
when discriminant (b2 – 4ac) > 0
2a
a) If ∆ = 𝑏 2 − 4𝑎𝑐 < 0 : Give a message like No roots!
b) If ∆ = 𝑏 2 − 4𝑎 = 0 : Give a message like Two coincident real roots!
c) If ∆ = 𝑏 2 − 4𝑎𝑐 > 0 : Give a message like Two distict real roots!
A sample run may be as follows:
4.
Write a C# program that accepts the score of a student as its parameter, then determines and returns the equivalent
letter grade according to the following criteria:
Score Letter grade
≥ 90
A
80 ≤ score ≤ 89
B
70 ≤ score ≤ 79
C
50 ≤ score ≤ 69
D
<50
F
Include the function in a working program. The student’s score have to read from textBox and button1_Click()calls
the function letter_grade() to find the equivalent letter grade.
a) Grade is less than 0 : Give an error message like: Grade must be greater than 0!
b) Grade is greater than 100: Give an error message like: Grade must be less than 100!
2
A sample run may be as follows:
3