11.13.cpp

这是C++的一部分练习程序!对初学者有一定的帮助作用。

#include <iostream.h>
class Point
{
  public: 
	virtual void Draw()=0;
};
class Line:public Point
{
  public:
	  void Draw()
	  {  cout<<"Line::Draw() called.\n";  }
};class Circle:public Point
{
  public:

	  void Draw()
	  {  cout<<"Circle::Draw() called.\n";  }
};
void DrawObject(Point *p)
{
	p->Draw();
}
void main()
{
	Line *lo=new Line;
	Circle *co=new Circle;
	DrawObject(lo);
	DrawObject(co);
}