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 both flow chart and pseudocode visualization), and implementation with C code. The example provided uses sequential, selection and repetition statements.
This program will calculate the sum of 10 integers. The program will ask the user to 10 integers. If the sum of the numbers is greater than 1000, a message is printed stating the sum is over 1000. The design step will include both pseudocode and flow chart visualization.
I will use sequential, selection and repetition programming statements.
I will define three integer numbers: count, value, sum. Count will store how many times values are entered to make sure we don’t exceed 10 values. Value will store the input integer and sum will store the running sum.
The sum will be calculated by this formula:
sum = sum + value
For example, if the first value entered was 4 and second was 10:
sum = sum + value = 0 + 4
sum = 4 + 10 = 14
Values and sum can be input and calculated within a repetition loop:
while count 1000 then
print “Sum is over 1000”
To verify this program is working properly the input values could be used for testing:
Sum = 12
Sum = 1200
Sum is over 1000.
Sum = -400
// This program will calculate the sum of 10 integers.
// Declare variables
Declare count, value, sum as Integer
//Initialize Counter, Sum to 0
Set sum = 0
// Loop through 10 integers
While count 1000)
Printf “Sum is over 1000”
The following is the C Code that will compile in execute in the online compilers.
// C code
// This program will calculate the sum of 10 integers.
// Developer: Faculty CMIS102
// Date: Jan 31, 2014
int main ()
/* variable definition: */
int count, value, sum;
/* Initialize count and sum */
count = 0;
sum = 0;
// Loop through to input values
while (count 1000)
printf(“Sum is over 1000n”);
Setting up the code and the input parameters in ideone.com:
Note the input integer values are 100, 100, 100, 100, 100, 200, 200, 200, 200, 200 for this test case. You can change these values to any valid integer values to match your test cases.
Results from running the programming at ideone.com:
Learning Exercises for you to try:
What would you change in the design and the code if you wanted to sum 20 integers as opposed to 10? (Hint: You should make the changes and try it)
What is the line of code doing?
sum = sum + value;
Is there other code you could use for the same results (Hint: Recall the increment operator) ?
Try at least 3 different test cases and check the output. How did you change the input values?
What happens if you entered a value other than an integer? (For example a float or even a string)
As always, experiment with the C code and design to continue to learn.
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