Calculate the average of student math marks until termination

Last update on September 18 2025 12:33:43 (UTC/GMT +8 hours)

Calculate the average of student math marks until termination

Write a C program to calculate the average mathematics marks of some students. Input 0 (excluding to calculate the average) or a negative value to terminate the input process.

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>
int main() {
    int marks[99], m, i, a=0, total=0;
    float f;
    
    // Prompt for user input
    printf("Input Mathematics marks (0 to terminate): ");
    
    // Loop to get input marks
    for(i = 0; ; i++) {
        scanf("%d", &marks[i]);
        if(marks[i] <= 0) {
            break;
        }
        a++;
        total += marks[i];
    }
    
    // Calculate and print average
    f = (float)total/(float)a;
    printf("Average marks in Mathematics: %.2f\n", f);
    
    return 0;
}

Sample Output:

Input Mathematics marks (0 to terminate): 10                           
15                                                                     
20                                                                     
25                                                                     
0                                                                      
Average marks in Mathematics: 17.50

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to calculate the average marks for multiple subjects, terminating input when a negative value is entered.
• Write a C program to compute the average of student marks while ignoring invalid inputs (e.g., marks outside 0-100) until termination.
• Write a C program to continuously read student marks, count the number of pass and fail scores, and calculate the average for the passing marks only.
• Write a C program to dynamically calculate the average marks for an unspecified number of students, terminating on a specific sentinel value.

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