#include <iostream>
using namespace std;

#if 0
static void f(int& x, int& y){
  x = 1;
  y = 2;
}
#endif

#define f(x, y) {x=1; y=2;}

int main(int argc, char **argv){
  int a[2] = {10, 20};
  int i = 0;
  f(i, a[i]);
  cout << i << endl;
  cout << a[0] << " " << a[1] << endl;
  return 0;
}