Pass by Reference or Passing Pointer to a Function in c++

This video tutorial explains how to pass a pointer to a function which is also called pass by reference in c++.
You will learn what happens when a pointer is passed to a function in c++, how to access the pointer in c++, how to pass the pointer to a function in c++ in detail with examples.

source code for this tutorial

#include <iostream>

using namespace std;
void display(int *ptr);

int main()
    int age = 24;


    cout << age << endl;

    return 0;

void display(int *ptr){

    cout << *ptr << endl;
    *ptr = 100;