#include <stdio.h>

main (int argc, char** argv) {

  short int buf_1[1];
  short int buf_2[1];

  FILE* fp_1 = fopen(argv[1], "r");
  FILE* fp_2 = fopen(argv[2], "r");

  rewind(fp_1);
  rewind(fp_2);

  int sample_num=0;

  while (fread(buf_1, 2, 1, fp_1) > 0) {

    fread(buf_2, 2, 1, fp_2);

    printf("%d: %7d - %7d = %7d\n", sample_num, buf_1[0], buf_2[0],
	   buf_1[0] - buf_2[0]);

    sample_num++;
    buf_1[0] = 0;
    buf_2[0] = 0;

  }

  fclose(fp_1);
  fclose(fp_2);

}