gistfile1.cpp

#include <iostream>
#include <cstdio>
 
using namespace std;
 
#define CONCAT(a, b) a##b
 
#define file_type CONCAT(FI, LE)
#define file_open CONCAT(fo, pen)
#define file_scanf CONCAT(fs, canf)
#define file_printf CONCAT(fp, rintf)
#define file_close CONCAT(fc, lose)
 
int main(int argc, const char *argv[]) {
  file_type * f = file_open("use_macro_to_create_file", "r");
  char str[100] = {0};
  file_scanf(f, "%s", str);
  file_close(f);
  return 0;
}