Swapping function in c++

 #include<iostream>

using namespace std;

void swapnum(int& a, int& b){

    cout<<"Before swaping: "<<endl;

    cout<<"a = "<<a<<","<<"b = "<<b<<endl;

    int temp = a;

    a = b;

    b = temp;

    cout<<"After swaping: "<<endl;

    cout<<"a = "<<a<<","<<"b = "<<b<<endl;

}

int main(){

    int x = 12;

    int y = 4;

   swapnum(x, y);

   

    return 0;

}