Write a C++ program to illustrate virtual function implementation.

Write a C++ program to illustrate virtual function implementation.

Program Code:

Step 1: Create a class base with a method marked as virtual.

Step 2: Create a subclass of the base called derived and redefine the method defined in step 1.

Step 3: Create an object pointer of type base and Create it point to an object of type base first and call the methods you had marked as virtual using -> operator.

Step 4: repeat the same steps but by making the pointer point to an object of the derived type now.

Program Code:

#include<iostream.h>

class base

{

public:

void display()

{

cout<<"\nDisplay base";

}

virtual void show()

{

cout<<"\nShow base.";

}

};

class derived:public base

{

public:

void display()

{

cout<<"\nDisplay derived";

}

void show()

{

cout<<"\nShow Derived.";

}

};

int main()

{

base b;

derived d;

base *bptr;

bptr=&b;

cout<<"\nbptr points to base\n";

bptr->display();

bptr->show();

cout<<"\n\nbptr points to derived.";

bptr=&d;

bptr->display();

bptr->show();

return 0;

}

Sample Inputs and Outputs:

bptr points to base

Show base

Display base

bptr points to derived

Show derived

Display derived