#include <iostream>

/*void Swap (int *x, int *y) {
    int temp = x;
    *x = *y;
    *y = temp;
}*/

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

int main() {
    using namespace std;
    int a = 5, b = 10;
    Swap(a, b);
    cout << "a:" << a << "\n";
    cout << "b:" << b << "\n";
    return 0;
}