C++ Swap() Function

#include<iostream>
using namespace std;
int main()
{
    int a, b;

    cout << "Enter Two Number : ";
    cout << "\na = ";
    cin >>  a;
    cout << "\nb = ";
    cin >> b;

    swap(a, b);

    cout << "\nAfter Swap a = " << a << endl;
    cout << "After Swap b = " << b << endl;

    return 0;
}