Create a base class called 'SHAPE'

 Create a base class called 'SHAPE' having

-          two data members of type double

-          member function get-data( ) to initialize base class data members

-          pure virtual member function display-area( ) to compute and display the area of

the geometrical object.

Derive two specific classes 'TRIANGLE' and 'RECTANGLE' from the base class. Using these three classes design a program that will accept dimension of a triangle / rectangle interactively and display the area.

#include<iostream.h>

#include<conio.h> class shape

{

protected:double x, y;

public:void getdata(double a, double b)

{

x=a;

y=b;

}

virtual void display_area()=0;

};

class triangle:public shape

{

double triangle_area; void display_area()

{

triangle_area=(1*x*y)/2;

cout<<"area of triangle is:"<<triangle_area<<endl;

}

};

class rectangle:public shape

{

double rectangle_area; void display_area()

{

rectangle_area=x*y;

cout<<"area of rectangle is:"<<rectangle_area;

}

};

int main()

{

clrscr(); shape *p; triangle t; rectangle r;

p=&t; p->getdata(10,30); p->display_area(); p=&r; p->getdata(20,30); p->display_area(); getch();

return 0;

}

*******************************OUTPUT*******************************

area of triangle is:150 area of rectangle is:600