/* File I/O example */

#include <stdio.h>


int main() {

FILE *in, *out;

int x, i, z;

z=0;
i=0;

in = fopen("input1.txt","r");

out = fopen("output1.txt", "w");

for(i=fscanf(in, "%d",&x), i != EOF, i= fscanf(in, "%d",&x)) {
  i++;
  z += x;

  fprintf(out, "Step %d: sum= %d\n",i,z);
   printf("Step %d: sum= %d\n",i,z);
}

fclose(in);
fclose(out);


return 0;
}