30-pass_pointers_to_func.c

//
// Created by Halil Acar on 13.05.2021.
//
#include <stdio.h>

/* function declaration */
double getAverage(int *arr, int size);

int main () {

    /* an int array with 5 elements */
    int balance[5] = {1000, 2, 3, 17, 50};
    double avg;

    /* pass pointer to the array as an argument */
    avg = getAverage( balance, 5 ) ;

    /* output the returned value  */
    printf("Average value is: %f\n", avg );
    return 0;
}

double getAverage(int *arr, int size) {

    int  i, sum = 0;
    double avg;

    for (i = 0; i < size; ++i) {
        sum += arr[i];
    }

    avg = (double)sum / size;
    return avg;
}