average.c

#include <stdio.h>


/**
 * average.c
 *
 * this program will allocate memory for an integer array on the stack, and
 * demonstrate how C treats values passed by value as opposed to by reference.
 */

int averageGradeValue (int grades[], int count, int bonus);


int main() {

    int grades[5] = {50, 60, 40, 30, 70};
    int average = 0;

    for (int i = 0; i < 5; i++) {
        average += grades[i];
    }
    average /= 5;

    printf ("Your average mark is %d. ", average);
    puts (average < 50 ? "You failed!" : "You passed!");

    average = averageGradeValue (grades, 5, 5);  // passed value modified
    printf ("Your average mark is %d. ", average);
    puts (average < 50 ? "You failed!" : "You passed!");

    return 0;
}


int averageGradeValue (int grades[], int count, int bonus) {

    int average = 0;

    for (int i = 0; i < count; i++) {
        average += grades[i];
    }
    average /= count;
    return average + bonus;
}