Swap Two Values

#include <iostream>
using namespace std;

// your code here: define swapPtr(int* a, int* b)
void swapPtr(int *a,int *b)
{
   *a=*a+*b;
   *b=*a-*b;
   *a=*a-*b;
}

// your code here: define swapRef(int& a, int& b)
void swapRef(int &a,int &b)
{
   a=a+b;
   b=a-b;
   a=a-b;
}

int main() {
   int x, y;
   cin >> x >> y;
   int a = x, b = y;
   swapPtr(&a, &b);
   cout << "After swapPtr: a=" << a << " b=" << b << "\n";
   int c = x, d = y;
   swapRef(c, d);
   cout << "After swapRef: a=" << c << " b=" << d;
   return 0;
}