#include <stdio.h>

main(void)
{
  
  int a, sum;
  FILE *ifp, *ofp ;

  ifp = fopen("/u2/staff/ryan/numbers.dat", "r");
  ofp = fopen("sum.dat", "w");

  a = 0;
  sum = 0;

  while ( fscanf(ifp, "%d", &a) ==1)
    {
      sum += a;
    }
  fprintf(ofp, "the sum is %d\n", sum);
  fclose(ifp);

}