l8_10.cpp

《C++程序设计教程》-杨国兴-电子教案及例题 C++程序设计PPT课件 html课件 例题

#include <iostream.h>
#include <string.h>
class CPoint
{
private:
	int X;
	int Y;
public:
	CPoint(int x=0, int y=0)
	{
		X=x;
		Y=y;
	}
	CPoint(CPoint &p)
	{
		X=p.X;
		Y=p.Y;
	}
	int GetX()
	{
		return X;
	}
	int GetY()
	{
		return Y;
	}
};

class CShape
{
private:
	char Color[10];
public:
	CShape(char *c)
	{
		strcpy(Color,c);
	}
	virtual void Draw() = 0;
	void PrintColor()
	{
		cout << Color << endl;
	}
};

class CLine:public CShape
{
private:
	CPoint Start;
	CPoint End;
public:
	CLine(CPoint s, CPoint e, char *c):CShape(c),Start(s),End(e)
	{}
	virtual void Draw()
	{
		cout << "Draw a Line from (" << Start.GetX() << "," << Start.GetY();
		cout << ") to ("<< End.GetX() << "," << End.GetY() << "), with color ";
		PrintColor();
	}
};

class CCircle:public CShape
{
private:
	CPoint Center;
	int Radius;
public:
	CCircle(CPoint ctr, int r, char *c):CShape(c),Center(ctr)
	{
		Radius = r;
	}
	virtual void Draw()
	{
		cout << "Draw a Circle at center (" << Center.GetX() << "," ;
		cout << Center.GetY()<< ") with radius " << Radius << " and color ";
		PrintColor();
	}
};

void main()
{
	CShape *ps[3];
//	CShape s("Red");
	CPoint p1(10,10), p2(100,100),p3(50,50);
	CLine  l(p1,p2,"Green");
	CCircle c(p3, 20, "Black");
//	ps[0] = &s;
	ps[1] = &l;
	ps[2] = &c;
	for(int i=1; i<3; i++)
		ps[i]->Draw();
}