[Applied] Build a Simple Grade Aggregation Program

This lesson covers building a simple grade-aggregation program in C using arrays, so you understand how to combine what you've learned so far into an applied program. It's for anyone searching "C grade aggregation applied implementation."

Let's combine arrays and loops, covered so far, to build a program that aggregates several people's grades. Totaling and averaging data stored in an array is a basic pattern that comes up frequently in real work too.

The example stores several people's scores in an array called scores, adding up every element with a for loop into total to find the sum. More advanced logic, like computing an average from the total, can be implemented as an extension of this.

A common early mistake is integer division when computing an average. Dividing two integers truncates anything after the decimal point, so you need to cast one side to double to get an accurate average.

The knowledge covered so far — pointers, structs, arrays — carries directly over into real C embedded development and systems programming; these are core skills for C. Well done getting this far.

📖 Reference code

#include <stdio.h>

int main(void) {
    int scores[] = {88, 95, 60, 72, 100};
    int n = 5;
    int total = 0;
    for (int i = 0; i < n; i++) {
        total += scores[i];
    }
    printf("Total: %d\n", total);
    printf("Average: %.1f\n", (float)total / n);
    return 0;
}

✍️ Your code

Type your code, then press "Run"

🧪 This site can't compile or run C directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser — nothing is sent anywhere).