pointer swap error3.

I am supposed to write a function that swaps the values of two integers using pointers.While I don't need it to show me the swap values as output, I have done so because I want to see if it works correctly, as I'm new to pointers.

#include <iostream>
#include <stdlib.h> // pause screen after completion
using namespace std;
int SwapIntegers(int *p1, int *p2);



int main() 
{

int x,y; // variable declaration

int *px = &x;
int *py = &y;

SwapIntegers (px, py);
     
cout << "x is " << px << endl 
     << "y is " << py  << endl;

                 
    
system("pause"); //stop the screen
    
} // end main


// swap function

int SwapIntegers (int px, int  py)

{

cout << "Enter first integer: ";
     cin >> px;
     
     cout << "Enter second integer: ";
     cin >> py;

cout << "x is: " << px << " before swapping" << endl
     << "y is: " << py << " before swapping" << endl;
     
   px ^= py;
   py ^= px;
   px ^= py;
        
  return(px, py);
  
} // end function swap

I get the following error:

" [Linker error] undefined reference to `SwapIntegers(int*, int*)' ld returned 1 exit status "