#include <stdio.h>


int main ()
{
   int primes[] = { 1 , 2, 3, 5, 7, 11, 13, 17, -1};
   int * pi;

   for (pi = primes; *pi != -1; pi++)
   {
      printf("The %dth primes is: %d\n",(pi-primes),*pi);
   }   

   /* EXERCISE : print the array in reverse */

   return 0;
}