Swap two numbers

#include<iostream>
using namespace std;

void swapTwoNums(int &a, int &b){
    int c = a; // c = 5, a = 5

    a = b; // a = 10, b=10

    b = c; //b = 5, a = 10

}

int main(){

    int a = 5, b =10;

    swapTwoNums(a,b);

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

}