没报错，也不能运行？

Question

#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 %u bytes.\n",sizeof marbles);
    return 0;
}

int sum(int ar[], int n)
{
    int i;
    int total = 0;

    for (i = 0; i < n; i++)
        total += ar[i];
    printf("The size of ar is %u bytes.\n", sizeof ar);

    return total;
}

Answer 1

我这边可以呀。