VIRTUAL FUNCTION

AIM:
         To implement a C++ program to illustrate virtual function

ALGORITHM:

Step 1: Include the header files

Step 2: Declare the base class base.

Step 3: Declare and define the virtual function show().

Step 4: Declare and define the function display().

Step 5: Create the derived class from the base class.

Step 6: Declare and define the functions display() and show().

Step 7: Create the base class object and pointer variable.

Step 8: Call the functions display() and show() using the base class object and pointer.

Step 9: Create the derived class object and call the functions display() and show() using the derived class object and pointer.

PROGRAM:

#include<iostream.h>

#include<conio.h>

class base

{

    public:

      virtual void show()

      {

                cout<<"\n  Base class show:";

      }

      void display()

      {

              cout<<"\n  Base class display:" ;

      }

};

 class drive:public base

{

   public:

      void display()

      {

              cout<<"\n  Drive class display:";

      }

      void show()

      {

              cout<<"\n  Drive class show:";

      }

};

 void main()

{

   clrscr();

   base obj1;

   base *p;

   cout<<"\n\t P points to base:\n"  ;

    p=&obj1;

   p->display();

   p->show();

  cout<<"\n\n\t P points to drive:\n";

   drive obj2;

   p=&obj2;

p->display();

   p->show();

   getch();

}

SAMPLE OUTPUT:

              P points to Base

              Base class display

              Base class show

              P points to Drive

              Base class Display

              Drive class Show

RESULT:

                Thus a C++ program to illustrate virtual function is implemented successfully.