#include <iostream.h>

void  scambio(int &x, int &y  ) {
    int temp;  
    temp = x; x = y; y =temp;
}


int main() {
  int a,b;
  a = 1; b=2;
  cout << a  << b << endl;
  scambio(a,b);
  cout << a  << b << endl;
  return 0;
}