TUTORIAL FINAL EXAM EKT120 SESSION 1 2013/2014
SECTION A
Question 1
(a) Write a proper declaration for the problem given.
(i) An array to calculate quarterly quantity of sales in a year.
(ii) A function prototype to identify the minimum value from the three values sent to it.
(b) For each of the following, write a single statement that performs the indicated task. Assumed
that variables iValue1 and iValue2 of type int have been declared, and that iValue1 has
been initialized to 100,000.
(i)
Declare the variable piNum1 to be a pointer to an object of type int.
(i)
Assign the address of variable iValue1 to pointer variable piNum1.
(ii)
Print the value of the object pointed to by piNum1.
(iii)
Assign the value of the object pointed to by piNum1 to variable iValue2.
(iv)
Print the address stored in piNum1. Use the %p conversion specifier. Is the value
printed the same as the address of iValue1?
1
Question 2
Consider the program in Figure 2 and answer the questions.
# include <stdio .h>
int functionA (int);
int main () {
int p, count ;
printf ("How many times to repeat ? ");
scanf ("%d", &count );
for (p = 0; p < count ; ++p) {
printf ("%d\t%d\n", p, functionA (p));
}
return 0;
}
/* functionA function */
int functionA (int z) {
int y, da , db , dc;
y = da = db = dc = 2;
while (z > y) {
y = y + 1;
dc = da * db;
}
return dc;
}
Figure 2
(a) Trace the output of the given program segment.
(b) Sketch a flowchart for the functionA function.
(c) Rewrite the while loop into for loop statements in functionA.
Question 3
(a) C codes in Figure 3a is to determine the charge for three (3) types of services. Identify the
errors and rewrite the correct code segment.
float detCharge (int type) {
switch
case 1: charge = 10.00;break;
case 2: charge = 20.00;break;
case 3: charge = 30.00;
default: charge = 0.00;
}
int main( ) {
float item;
printf("Please enter your selected service type: ");
scanf(“%i”,&item);
printf(“Your selected service price is %f\n”,detPrice(service_item);
return 0;
}
Figure 3a
(b) Write in the blank to complete the program segment shown in Figure 3b to calculate the total
sales and the average sales of ten (10) items.
44
25
77
103
49
81
34
55
66
99
#define item 10
void getInput (int ______(i)________) {
int i;
printf("Please enter sales from ten items : ");
for (i=0; i<item; i++) {
scanf(“%d”, ______(ii)________;
}
}
calTotAvgSales (int ____(iii)_____, float *total, float ____(iv)_____){
int i;
*total = 0.0;
for (i=0; i<item;i++)
*total = *total + Sales[i];
*average = *total/item;
}
int main( ) {
int sales[item];
float totalSales, avgSales;
getInput( _______(v)_________ );
calTotAvgSales(____(vi)_____, _____(vii)_____, ____(viii)______);
return 0;}
Figure 3b
(c) Write the output after executing the program segment in Figure 3c.
int func (int r, int s) {
r -= 2;
printf("r = %d\ts = %d.\n", r, s);
return r-- * ++s;
}
int sub (int *p, int *q) {
*p += 5;
printf("p = %d\tq = %d.\n", *p, *q);
return *p++ + --*q;
}
int main() {
int m = 5, n = 7;
n = func(m, n);
printf("m = %d\tn = %d.\n", m, n);
n = sub(&m, &n);
printf("m = %d\tn = %d.\n", m, n);
return 0;
}
Figure 3c
Question 4
Figure 4 is the declaration of structure and array of structure:
struct itemType
{
string product;
string productType;
};
struct goodsType
{
itemType name;
int productRating;
log int productID;
string supplier;
float price;
};
goodsType goods [50];
goodsType newGoods;
Figure 4
Write C statements for the tasks below:
(a) to store the following information in newGoods:
productName: DutchLady_milk1.0L
productType : dairy
productID : 0100155
productRating:1
supplier:DL
price:4.80
(b)
to copy the information of the tenth component of the array goods into newGoods.
(c)
to update the price of the goods in the array goods by adding 0.45 to its previous value.
Question 5
Below is parallel resistance equation.
1 / [1/r1 + 1/r2 + 1/r3]
A program reads an input file named “data.txt” that contains the value of r1, r2 and r3 and
performed the calculation to determine its corresponding parallel resistance value, then print all
the values into an output file named “result.txt. The sample of input and output files are as shown
in Figure 5a and Figure 5b respectively.
A sample input file:
10 20 30
15 25 35
100 100 100
120 40 50
80 180 450
200 35 110
20 150 440
105 35 55
A sample output file:
0.1830
0.1352
0.030
0....
0....
0....
0....
0....
Figure 5a
Figure 5b
Write C statements based on the above problem statements using the following
guidelines:
(a) Declare two file pointers which points to FILE, namely input and output.
(b) Open a file for reading named “data.txt”with internal file name input; likewise open a file
for writing named “result.txt”with internal file name output.
(c) Perform file verification towards input file.
(d) Read a record from the file “data.txt”. The record consists input of type integer, namely r1,
r2 and r3.
(e) Write a record to the file “result.txt”. The record consists of output of type double, namely
resistance.
Section B
Answer ANY TWO (2) questions in this section.
Question 6
Write a program for the National Earthquake Information centre implementing the following
decision table to characterize an earthquake based on its Richter scale number.
Richter Scale Number (N) Characterization
N < 5.0
Little or no damage
5.0 ≤ N ≤ 5.5 Some damage
5.5 ≤ N ≤ 6.5 Serious damage: wall may crack or fall
6.5 ≤ N ≤ 7.5 Disaster: house and buildings may collapse
higher Catastrophe: most buildings destroyed
(a) Sketch the flowchart for the program.
(b) Produce a C program based on flowchart in (a).
Question 7
Your friend has just opened a computer appliances shop at Changloon. He asked your help to
develop a computer program which can be used at the counter. Your program should be able to
input the customer’s order which could be more than one item. Produce a C program to calculate
the total price for the order.
You must implement array in your program. The program must have at least one function to
calculate the total price of the order.
Use the price from Table 7 for the calculation.
Table 7
itemNo.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Items
Hewlett Packard laptop
Longitech Optical Mouse
Lenovo laptop
Acer laptop
Samsung Tablet
Apple Tablet
Memory card Altek
Portable Hardisk 260GB
Portable Hardisk 80GB
Pendrive 4GB
Price
RM 3999
RM 31.80
RM 4400
RM 1999
RM 1499
RM 2333
RM 79.00
RM 280
RM 150
RM19.00
Question 8
You are the owner of a hardware store and need to keep an inventory that can tell you what tools
you have, how many you have and the cost of each one. Write a C program to create a file named
storage.dat and write the data shown in the Table 1 into the file. Also produce a C program to
read the data from the file and print to the screen the list of all tools which quantity count falls
below 40 and costs more than RM 50.00.
struct inventory
{
long int recNumber;
char toolName[40];
int quantity;
float cost;
};
Table 1: Inventory Details
Record Number
Tool Name
Quantity
Cost (RM)
3
Electric_sander
7
37.00
17
Hammer
76
29.00
24
Jig_saw
21
34.00
39
Lawn_mower
3
399.00
56
Power_saw
18
499.00
68
Screw_driver
106
17.00
77
Sledge_hammer
11
89.00
83
Wrench
34
33.00
Use the sample output below as a guide.
Enter number of tools
8
Enter the Record Number
3
Enter Tool Name
Electric_sander
Enter Quantity
7
Enter cost of each tool
37.00
…..
…..
Tools below 40 and costs > RM 50.00
39
Lawn_mower
3
399.00
56
Power_saw
18
499.00
77
Sledge_hammer
11
89.00
-oo0oo-