/*   loop03.c               */

#include <stdio.h>

int main(void)
{
   int c,s,n;

   s=0;
   n=1;

   do  {
      printf("n=%d\n",n);
      printf("c=");
      scanf("%d",&c);
      if  (c>0)
      {
            s=s+c;
            printf("s=%d\n",s);
      } 
      n=n+1;  /* n++ */
   } while (c>0);
   printf("sum=%d\n",s);

   return 0;
}