Write a C++ program to demonstrates call by reference functionality in user defined function.

Write a C++ program to demonstrates call by reference functionality in user defined function.

Program Code:

#include<iostream>

using namespace std;

void swap(int &, int &);

int main()

{

int a, b;

cout<<"Enter any two number to swap with each other : ";

cin>>a;

cin>>b;

cout<<endl;

cout<<"Value of entered number before swaping : "<<endl;

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

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

swap(a, b);

cout<<"Value of entered number after swaping :"<<endl;

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

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

return 0;

}

void swap(int &x, int &y)

{

int temp;

temp = x;

x = y;

y = temp;

cout<<"Value of entered number within swaping function :"<<endl;

cout<<"a = "<<x<<endl;

cout<<"b= "<<y<<endl;

}

The program code is tested on www.jdoodle.com

Output:

Enter any two number to swap with each other : 10 15

Value of entered number before swaping : 

a = 10

b = 15

Value of entered number within swaping function :

a = 15

b= 10

Value of entered number after swaping :

a = 15

b = 10

Thanks

Mukesh Rajput