Pointer vs Reference Swap

#include <iostream>

void swapPtr(int* a, int* b){
    int temp=*(a);
    *a=*b;
    *b=temp;
};
 void swapRef(int& a, int& b){
    int temp=b;
    b=a;
    a=temp;
 }

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;
}