#include <iostream>

using namespace std;

void Swap1(int* a, int* b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}

void Swap2(int& a, int& b) {
    int temp = a;
    a = b;
    b = temp;
}

int main() {
    setlocale(LC_ALL, "ru");

    int a = 5, b = 10;

    cout << a << " " << b << endl;
    Swap1(&a, &b);
    cout << a << " " << b << endl;
    Swap2(a, b);
    cout << a << " " << b << endl;
}