wap to swap two number in cpp

#include <iostream>
using namespace std;

void swap(int&, int&);

int main()
{
    int a = 1, b = 2;
    cout << "Before swapping \n";
    cout << "a = " << a  << "\nb = " << b;
   
    swap(a, b);
    cout << "\nAfter swapping\n"<< "a = " << a << "\nb = " << b << endl;
   
   return 0;
}

void swap(int& n1, int& n2) {
    int temp;
    temp = n1;
    n1 = n2;
    n2 = temp;
}

Output:

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