Compare Files

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
  if (argc < 2) {
    fprintf(stderr, "Usage: %s FILE1 FILE2\n", argv[0]);
    exit(EXIT_FAILURE);
  }
  FILE *f1 = fopen(argv[1], "r");
  FILE *f2 = fopen(argv[2], "r");
  int c1, c2;
  while (1) {
    c1 = fgetc(f1);
    c2 = fgetc(f2);
    if (c1 != c2) {
      puts("differ");
      exit(EXIT_SUCCESS);
    }
    if (c1 == EOF) break;
  }
  puts("same");
  return EXIT_SUCCESS;
}