Example of inheritance programming

[1] Define class p with two variables as data members. Define another class d which inherits the data members of p. Multiply two variables and display it.

#include<iostream.h>

#include<conio.h>

class p

{

  protected:

        int  a,b;

  public:

        void input()

        {

                cout<<"\n Enter a,b:";

                cin>>a>>b;

        }

        void display()

        {

                cout<<"\n a : "<<a;

                cout<<"\t b : "<<b;

        }

};

class d : public p

{

        int  c;

  public:

        void input()

        {

                p :: input();

                c = a * b;

        }

        void display()

        {

                p :: display();

                cout<<"\t Mul : "<<c;

        }

};

void main()

{

        clrscr();

        d d1;

        d1.input();

        d1.display();

        getch();

}

OUTPUT:

Enter a,b:10   20

a : 10  b : 20  Mul : 200