#include <stdio.h>

int main(void) 
{
      int i;
      int arr[] = {1,2,3,4,5,6,7,8,9};
      int sum = 0;
      
      printf("%d\n", arr[2]); // show 3
       
      for (i = 0; i < 9; i++) { // the positions in arrays start from 0!!
          
          sum = sum + arr[i]; // the sum of all the elements in the array
      } 
      
      return 0;
}