text: // sum_arr1.c
  #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 nuber 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)
  {
      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;
  }