PROGRAM FOR VIRTUAL FUNCTION FOR RUNTIME POLYMORPHISM

//program for run time polymorphism using virtual function
#include<iostream.h>
#include<conio.h>
class base
{
  public:
    void display()
    {
       cout<<"\n display base:";
    }
    virtual void show()
    {
       cout<<"\nshow base:";
    }
};
class derived:public base
{
  public:
  void display()
  {
    cout<<"\n display derived:";
  }
  void show()
  {
  cout<<"\nshow derived:";
  }
};
void main()
{
base b;
derived d;
base *bptr;
clrscr();
cout<<"\n bptr points to base\n";
bptr=&b;
bptr->display();
bptr->show();
cout<<"\n\n bptr points to derived\n";
bptr=&d;
bptr->display();
bptr->show();
getch();
}