passByValue and passByReference

// SortingAlgorithm.cpp : This file contains the 'main' function. Program execution begins and ends there.
#include <iostream>

void swapByValue(int el1, int el2)
{
    // Swapping algorithm
    int temp = el1;
    el1 = el2;
    el2 = temp;

    /*std::cout << "el1: " << el1 << "\n\n";
    std::cout << "el2: " << el2 << "\n\n";*/
}

void swapByReference(int& el1, int& el2)
{
    int temp = el1;
    el1 = el2;
    el2 = temp;
}

int main()
{
    int num1 = 5;
    int num2 = 6;

    // Before swapping
    std::cout << "Before Swap\n";
    std::cout << "num1: " << num1 << "\n";
    std::cout << "num2: " << num2 << "\n\n\n";

    // After swapping
    std::cout << "After Swap\n";
    // call function here
    // swapByValue(num1, num2);
    swapByReference(num1, num2);
    std::cout << "num1: " << num1 << "\n";
    std::cout << "num2: " << num2 << "\n";

    return 0;
}