Function in C++

Simple example of Function in C++, which explain the working of call by reference:

Program Code:

#include <iostream>

using namespace std;

void swap(int &x, int &y);

int main () 

{

int a = 100;

int b = 200;

cout << "Before swap, value of a :" << a << endl;

cout << "Before swap, value of b :" << b << endl;

swap(a, b);

cout << "After swap, value of a :" << a << endl;

cout << "After swap, value of b :" << b << endl;

return 0;

}

void swap(int &x, int &y) 

{

int temp;

temp = x; 

x = y;    

y = temp; 

return;

}

The output of the program is tested on www.jdoodle.com

Output:

Before swap, value of a :100

Before swap, value of b :200

After swap, value of a :200

After swap, value of b :100

Thanks

Mukesh Rajput