// copy_digits.cpp

#include <stdio.h>
int main() {
  int c;
  FILE *in=fopen("digits.txt", "rb");
  FILE *out=fopen("copied_digits.txt", "wb");
  if (in && out) {
    while ((c=getc(in))!=EOF)
      putc(c, out);
  }
  return 0;
}