Swap 2 numbers using XOR in C++

#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int a, b;
    cin >> a >> b;
    cout << "Before:" << '\n';
    cout << a << " " << b << '\n';
    a ^= b;
    b ^= a;
    a ^= b;
    cout << "After:" << '\n';
    cout << a << " " << b << '\n';
    return 0;
}