#include <stdio.h>

void main() {
  const int n = 100;
  char buf [n];
  FILE *in = fopen (in_file,r);
  FILE *out = fopen (out_file,w);
  if (!in) return;
  while (!feof(in)) {
     fgets(buf, n, in);
     fputs(buf, out);
  }
  fcloseall();
}