HIERARCHICAL INHERITANCE IN C++

#include<iostream.h>


#include<conio.h>

class B

{

protected:

int x,y;

public:

void assign()

{

x=10;

y=20;

}

};



class d1:public B

{

int s;

public:

void add()

{

s=x+y;

cout<<s;

}

};



class d2:public B

{

int t;

public:

void sub()

{

t=x-y;

cout<<t;

}

};



class d3:public B

{

int m;

public:

void mul()

{

m=x*y;

cout<<m;

}

};



void main()

{

clrscr();

d1 a;

d2 b;

d3 c;

a.assign();

a.add();

b.assign();

b.sub();

c.assign();

c.mul();

getch();

}