C++ Program to use the virtual function

Program -

#include<iostream.h>

#include<conio.h>

#include<math.h>

class abc

{

public:

int a,b;

void read()

{

cout<<"enter the integer values";

cin>>a>>b;

}

virtual void display()

{

cout<<"this is base class abc;"<<endl;

}

};

class xyz:public abc

{

private:

int c,r;

public:

void display()

{

abc::read();

c=a+b;

cout<<"the sum is="<<c<<endl;

}

};

class lmn:public abc

{

private:

int d;

public :

void display()

{

abc::read();

d=a*b;

cout<<"the multiplaction is="<<d;

}

};

void main()

{

clrscr();

class abc*p;

class xyz m;

cout<<"base class xyz:"<<endl;

p=&m;

p->display();

cout<<"\n base class lmn\n ";

class lmn r;

p=&r;

p->display();

getch();

}

Output - 

base class xyz:

enter the integer values 9 8

the sum is=17

base class lmn

enter the integer values7 5

the multiplaction is=35