Pointer vs Reference Swap

#include <iostream>

void swapPtr(int *a, int *b){
    *a^=*b;
    *b^=*a;
    *a^=*b;
}

void swapRef(int &a, int &b){
    a^=b;
    b^=a;
    a^=b;
}

int main() {
    int x, y;
    std::cin >> x >> y;

    int a = x, b = y;
    swapPtr(&a, &b);
    std::cout << "After swapPtr: a=" << a << " b=" << b << "\n";

    int c = x, d = y;
    swapRef(c, d);
    std::cout << "After swapRef: a=" << c << " b=" << d;

    return 0;
}

Solving Approach