CMIS 102 Hands-On Lab

// Week 5

**Overview:**

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 visualization), and implementation with C code. The example provided uses sequential, repetition statements and nested repetition statements.

**Program Description:**

This program will calculate the average of 3 exams for 5 students. The program will ask the user to enter 5 student names. For each of the students, the program will ask for 3 exam scores. The average exam score for each student will be calculated and printed.

**Analysis:**

I will use sequential and repetition programming statements.

I will define one String to store student name: StudentName.

I will define three Float numbers: Examvalue, Sum, Avg to store exam values the sum of the exams and the average of the exams.

The sum will be calculated by this formula:

Sum = Sum + Examvalue

For example, if the first value entered was 80.0 and second was 90.0 and the third exam was 100.0:

sum = sum + Examvalue = 0.0 + 80.0

sum = 80.0 + 90.0 = 170.0

sum = 170.0 + 100.0 = 270.0

Avg is then calculated as:

Avg = sum/3.0

For example 270.0/3.0 = 90.0

A nested repetition loop can be used to loop through each of the 5 students and each of the 3 exams:

For (students=0; students <5; students++)

For (exams=0;exams<3;exams++)

End For

End For

Sum values will need to be reset for each student to ensure only one student data is used for calculations each time.

**Test Plan:**

To verify this program is working properly the input values could be used for testing:

Test Case

Input

Expected Output

1

Studentname=Chris

Examvalue1=80.0

Examvalue2=90.0

Examvalue3=100.0

Studentname=John

Examvalue1=70.0

Examvalue2=90.0

Examvalue3=80.0

Studentname=Sally

Examvalue1=100.0

Examvalue2=100.0

Examvalue3=100.0

Studentname=Pat

Examvalue1=50.0

Eexamvalue2=70.0

Examvalue3=60.0

Studentname=Sam

Examvalue1=90.0

Examvalue2=95.0

Examvalue3=100.0

Average for Chris is 90.0

Average for John is 80.0

Average for Sally is 100.0

Average for Pat is 60.0

Average for Sam is 95.0

**Pseudocode:**

// This program will calculate the average of 3 exams for 5 students

// Declare variables

Declare StudentName as String

Declare ExamValue, Sum, Avg as Float

// Loop through 5 Students

For (students=0; students <5 ; students++)

// reset Sum to 0

Set Sum =0.0

Print “Enter Student Name”

Input StudentName

// Nested Loop for Exams

For (exams=0; exams < 3; exams++)

Print “Enter exam grade: n”

Input ExamValue

Set Sum = Sum + ExamValue

End For

Set Avg = Sum/3.0

Print “Average for “ + StudentName + “ is “ + Avg

End For

**Flow Chart:**

**C Code**

The following is the C Code that will compile in execute in the online compilers.

// C code

// This program will calculate the average of 3 exams for 5 students.

// Developer: Faculty CMIS102

// Date: Jan 31, 2014

#include <stdio.h>

int main ()

{

/* variable definition: */

char StudentName[100];

float ExamValue, Sum, Avg;

int students,exams;

// Loop through 5 Students

for (students=0; students <5 ; students++)

{

// reset Sum to 0

Sum =0.0;

printf(“Enter Student Name n”);

scanf(“%s”, StudentName);

// Nested Loop for Exams

for (exams=0; exams < 3; exams++)

{

printf (“Enter exam grade: n”);

scanf(“%f”, &ExamValue);

Sum = Sum + ExamValue;

}

Avg = Sum/3.0;

printf( “Average for %s is %fn”,StudentName,Avg);

}

return 0;

}

Setting up the code and the input parameters in ideone.com:

Note the Student and ExamValues for this run were:

John: 90.0 80.0 100.0

Jim: 80.0 70.0 90.0

Joe: 70.0 100.0 100.0

Sally: 100.0 95.0 91.0

Sam: 30.0 54.0 68.0

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 input 10 students and 5 exams?
- What is the line of code doing?

char StudentName[100];

(Hint: We haven’t covered arrays, but a String can be thought of as an array of characters) ?

- What would happen if you moved the Set Sum = 0.0 from inside the for loop to right after the declaration. For example:

// Declare variables

Declare StudentName as String

Declare ExamValue, Sum, Avg as Float

// Initialize Sum

Set Sum = 0.0;

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