#include <iostream>

#include <cstdlib>



using namespace std;



void swap(int &x, int &y) {

  int tmp = x;

  x = y;

  y = tmp;

}



int main(int argc, char **argv) {

  int a = 5, b = 10;



  swap(a, b);

  cout << "a: " << a << "; b: " << b << endl;

  return EXIT_SUCCESS;

}