C program to calculate total average and percentage of five subjects

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Write a C program to input marks of five subjects of a student and calculate total, average and percentage of all subjects. How to calculate total, average and percentage of marks of five subjects in C programming. Logic to find total, average and percentage in C program.

Example

Input

Enter marks of five subjects: 95 76 85 90 89

Output

Total = 435
Average = 87
Percentage = 87.00

Required knowledge

Fundamentals of C, Data types, Talking user input in C

Logic to find total, average and percentage

Step by step descriptive logic to find total, average and percentage is -

  1. Read marks of five subjects in some variables say n1, n2, n3, n4 and n5.
  2. Apply the formula for finding sum i.e. total = n1 + n2 + n3 + n4 + n5.
  3. Apply the formula to find average using above total i.e. average = total / 5.
  4. Apply the formula for finding percentage i.e. percentage = (average / 500) * 100.
  5. Finally print values of all resultant variables total, average and percentage.

Program to find total, average and percentage

/**
 * C program to calculate total, average and percentage of five subjects
 */

#include <stdio.h>

int main()
{
    float n1, n2, n3, n4, n5; 
    float total, average, percentage;

    // Read marks of all five subjects
    printf("Enter marks of five subjects: \n");
    scanf("%f%f%f%f%f", &n1, &n2, &n3, &n4, &n5);

    // Calculate total, average and percentage one by one
    total = n1 + n2 + n3 + n4 + n5;
    average = total / 5.0;
    percentage = (total / 500.0) * 100;

    // Print the result
    printf("Total marks = %.2f\n", total);
    printf("Average marks = %.2f\n", average);
    printf("Percentage = %.2f", percentage);

    return 0;
} 
Output
Enter marks of five subjects: 95
76
85
90
89
Total marks = 435.00
Average marks = 87.00
Percentage = 87.00

Note: %.2f is used for printing fractional value only up to two decimal places. You can also use %f for printing fractional values normally up to six decimal places.

Happy coding ;)

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3 comments:

  1. This comment has been removed by the author.

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    Replies
    1. I made the excercice using do while loop so it calculates marks for 20 students

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    2. Well that's, a good approach Errahli. You can also use for loop or while loop for easiness.

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