Week 4 CMIS 102 Hands-On Lab Solution

This hands-on lab allows you to follow and experiment with the critical steps of developing a program including the program description, analysis, test plan, design (using pseudocode), and implementation with C code. The example provided uses sequential and selection statements.

Program Description
This program will calculate the sum of 5 integers. The program will ask the user to 5 integers. If the sum of the numbers is greater than 100, a message is printed stating the sum is over 100. The design step will include both pseudocode.

Analysis
I will use sequential, and selection programming statements.
I will define six integer numbers: value1, value2, value3, value4, value5 and sum. The value1, value2, value3, value4 and value5 variables will store the integers input by the user. The sum will store the sum of the 5 values.
The sum will be calculated by this formula:
sum = value1 + value2 + value3 + value4 + value5
For example, if the first values entered were value 1=1, value 2=1, value 3=2,value 4=2 and value 5=3
respectively:
sum = 1 + 1 + 2 + 2 + 3 = 9
The additional selection statement will be of this form:
If sum 100 then
print "Sum is over 100"
End If
Test Plan
To verify this program is working properly the input values could be used for testing:
Test Case Input Expected Output
1 value1=1
value2=1
value3=1
value4=0
Value5=2
Sum = 5
2 value=100
value=100
value=100
value=100
value=200
Sum = 600
Sum is over 100.
2
3 value= -100
value= -100
value= -200
value = 0
value= 200
Sum = -200
Pseudocode
// This program will calculate the sum of 5 integers.
// Declare variables
Declare value1, value2, value3, value4, value5, sum as Integer
//Initialize Sum to 0
Set sum = 0
// Enter values
Print “Enter an Integer for value1”
Input value1
Print “Enter an Integer for value2”
Input value2
Print “Enter an Integer for value3”
Input value3
Print “Enter an Integer for value4”
Input value4
Print “Enter an Integer for value5”
Input value5
// Calculate sum
sum = value1 + value2 + value3 + value4 + value5
// Print results and messages
Print “Sum is “ + sum
If (sum 100)
Printf “Sum is over 100”
End if
C Code
The following is the C Code that will compile in execute in the online compilers.
// C code
// This program will calculate the sum of 5 integers.
// Developer: Faculty CMIS102
// Date: Jan 31, XXXX
#include <stdio.h
int main ()
3
{
/* variable definition: */
int value1,value2,value3,value4,value5,sum;
/* Initialize sum */
sum = 0;
printf("Enter an Integer for value1\n");
scanf("%d", &value1);
printf("Enter an Integer for value2\n");
scanf("%d", &value2);
printf("Enter an Integer for value3\n");
scanf("%d", &value3);
printf("Enter an Integer for value4\n");
scanf("%d", &value4);
printf("Enter an Integer for value5\n");
scanf("%d", &value5);
sum = value1 + value2 + value3 + value4 + value5;
printf("Sum is %d\n " , sum );
if (sum 100)
printf("Sum is over 100\n");
return 0;
}
Setting up the code and the input parameters in ideone.com:
Note the input integer values are 100, 100, 100, 200 and 100, for this test case. You can change these
values to any valid integer values to match your test cases.
4
Results from running within ideone
5
Learning Exercises for you to complete
1. Demonstrate you successfully followed the steps in this lab by preparing screen captures of you
running the lab as specified in the Instructions above.
2. Change the C code to sum 10 integers as opposed to 5? (Hint: Please don’t use arrays or Loops
for this. We will be using those features in another week.) Support your experimentation with a
screen capture of executing the new code
3. Using the code you create in step 1, modify the code to print an additional statement if the sum
of the value is negative (Hint: Consider modifying the existing selection statement) Support your
experimentation with a screen capture of executing the new code.
4. Prepare a new test table with at least 3 distinct test cases listing input and expected output for
the code you created after step 2.
5. Create your own C code implementation of one of the following mathematical formulas:
a. y = mx + b; (slope of a line) Assume the user will be prompted to input m, x and b and
the program will calculate y. If the value of y is greater than 10, inform the user the
value is greater than 10.
b. a = PI * r*r; (area of circle). Assume the user will be prompted to input the radius r. You
can define PI as 3.1416. . If the value of a is greater than 10, inform the user the value is
greater than 10.
c. v = 4/3 PI r*r*r; (volume of sphere) Assume the user will be prompted to input the
radius r. You can define PI at 3.1416. If the value of v is greater than 10, inform the user
the value is greater than 10.
Be sure you provide not only the C code but a test table with at least 3 distinct test cases listing
input and expected output your mathematical formula.