Write a C++ program to implement the concept of Virtual functions.

Write a C++ program to implement the concept of Virtual functions.

Algorithm to solve the above problem:

1. Start the program.

2. Define a base class called base and define a function called display as virtual in it.

3. Derive a new class called derv1,derv2 using a base class called base and define a function ‘display’ in the respective classes.

4. Declare a base class pointer in main function and objects for derv1 and derv2 classes.

6. Assign derv1 and derv2 obj to base pointer

7. Now display function shows the derv1 and derv2 class’ function respectively.

Implementation of the above problem in C++:

#include<iostream>

using namespace std;

class base

{

public:

virtual void display() 

{

cout<<"Base class display function is called \n";

}

};

class derv1:public base

{

public:

void display() 

{

cout<<"Derived1's class display function is called \n";

}

};

class derv2:public base

{

public:

void display() 

{

cout<<"Derived2's class display function is called \n";

}

};

int main()

{

base *ptr, b;

ptr=&b;

ptr->display();

derv1 d1;

derv2 d2;

ptr=&d1;

ptr->display();

ptr=&d2;

ptr->display();

return 0;

}

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

Output:

Base class display function is called 

Derived1's class display function is called 

Derived2's class display function is called 

Thanks

Mukesh Rajput