Using pointers, write a function to swap the values of two ints. Test the function by calling it and printing the swapped values.

Here's an example implementation of a function that swaps the values of two integers using pointers:

#include <iostream>

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

int main() {
    int x = 5, y = 10;
    std::cout << "Before swap: x = " << x << ", y = " << y << std::endl;
    
    swap(&x, &y);
    
    std::cout << "After swap: x = " << x << ", y = " << y << std::endl;
    return 0;
}

This program first defines the `swap` function, which takes two integer pointers as arguments and swaps the values they point to. It then defines two `int` variables `x` and `y`, sets them to 5 and 10 respectively, and prints their values. The `swap` function is then called with the address of `x` and `y` as arguments, causing their values to be swapped. Finally, the new values of `x` and `y` are printed again to confirm that the swap was successful.