6. (C) Show the implementation of abstract class.

6. (C) Show the implementation of abstract class.

	#include<iostream.h> #include<conio.h>
	class shape
	{
	public:
	virtual int getarea()=0;
	void setwidth(int w)
	{
	width=w;
	}
	void setheight(int h)
	{
	height=h;
	}
	protected:
	int width;
	int height;
	};
	class rectangle:public shape
	{
	public:
	int getarea()
	{
	return(width*height);
	}
	};
	class triangle:public shape
	{
	public:
	int getarea()
	{
	return(width*height)/2;
	}
	};
	int main ()
	{
	clrscr();
	rectangle rect;
	triangle tri;
	rect.setwidth(5);
	rect.setheight(7);
	cout<<"total rectangle area:"<<rect.getarea()<<endl;
	tri.setwidth(5);
	tri.setheight(7);
	cout<<"total triangle area :"<<tri.getarea()<<endl;
	getch();
	return 0;
	}