Source Code : Program on Shap

//….Program on Shap.cpp…..//

#include

#include

class shape

{

  protected:

  float x,y;

  public:

  void getdata()

  {

    cout<<"enter x & y:"<

    cin>>x>>y;

  }

  virtual void display();

    /*  {

    cout<<"display area"<

  }*/

};

class triangle:protected shape

{

  float area;

  public:

    void area1()

    {

    area=(1/2)*x*y;

    }

  void display()

    {

  cout<<"area of triangle="<

    }

};

class rectangle:protected shape

{

  float area;

  public:

  void area1()

  {

    area=x*y;

  }

  void display()

  {

    cout<<"area of rectangle="<

  }

};

void main()

{

  clrscr();

  shape s;

  triangle t;

  rectangle r;

  shape *sptr;

  sptr=&s;

  sptr->getdata();

  sptr->display();

  sptr=&t;

  sptr->display();

  t.area1();

  sptr=&r;

  sptr->display();

  r.area1();

  getch();

}