Pointer vs Reference Swap

#include <iostream>
using namespace std;

// Define swapPtr(int* a, int* b)
void swap_ptr(int *a, int *b){
    int i = 0;
    int *temp = &i;              //set a temp pointer to store temp for swapping
    *temp = *a;                  //store the value pointing at a into temp address
    *a = *b;                     //store value pointing at b into a
    *b = *temp;                  //store value that we previously stored into temp back into b
}

// Define swapRef(int& a, int& b)
void swap_ref(int &c, int &d){
    int temp = c;
    c = d;
    d = temp;
}

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

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

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

    return 0;
}