#include <iostream>

template <class T>
void scambia(T& x, T& y) {
  T tmp = x;
  x = y;
  y = tmp;
}

int main() {
  int i = 10;
  int j = 20;
  cout << "Prima: " << i << "\t" << j << endl;
  scambia(i, j);
  cout << "Dopo: " << i << "\t" << j << endl;

  float x = 10.2;
  float y = 20.3;
  cout << "Prima: " << x << "\t" << y << endl;
  scambia(x, y);
  cout << "Dopo: " << x << "\t" << y << endl;

  char a = 's';
  char b = 't';
  cout << "Prima: " << a << "\t" << b << endl;
  scambia(a, b);
  cout << "Dopo: " << a << "\t" << b << endl;

  return 0;
}