// sum_arr1.c -- sums the elements of an array
// use %u or %lu if %zd doesn't work
#include <stdio.h>
#define SIZE 10
int sum(int ar[], int n);
int main(void)
{
    int marbles[SIZE] = {20,10,5,39,4,16,19,26,31,20};
    long answer;
    
    answer = sum(marbles, SIZE);
    printf("The total number of marbles is %ld.\n", answer);
    printf("The size of marbles is %zd bytes.\n",
           sizeof marbles);
    
    return 0;
}

int sum(int ar[], int n)     // how big an array?
{
    int i;
    int total = 0;
    
    for( i = 0; i < n; i++)
        total += ar[i];
    printf("The size of ar is %zd bytes.\n", sizeof ar);
    
    return total;
}