书籍源码

开发平台：
Visual C++

ep8_5.cpp：源码内容
							/*8.5	以点（point）类为基类，重新定义矩形类和圆类。点为直角坐标点，矩形水平放置，由左下方
的顶点和长宽定义。圆由圆心和半径定义。派生类操作判断任一坐标点是在图形内，还是在图形的边缘
上，还是在图形外。缺省初始化图形退化为点。要求包括拷贝构造函数。编程测试类设计是否正确。*/
#include <iostream>
#include <cmath>
using namespace std;
const double PI=3.1415926535;
class Point{
private:
	double x,y;
public:
	Point(){x = 0; y = 0; }
	Point(double xv,double yv){x = xv;y = yv;}
	Point(Point& pt){ x = pt.x; y = pt.y; }
	double getx(){return x;}
	double gety(){return y;}
	double Area(){return 0;}
	void Show(){cout<<"x="<<x<<' '<<"y="<<y<<endl;}
};
class Circle :public Point{
	double radius;
public:
	Circle(){radius = 0;}
	Circle(double xv,double yv,double vv):Point(xv,yv){radius = vv;}
	Circle(Circle& cc):Point(cc){radius = cc.radius;}  //拷贝构造函数	
	double Area(){return PI*radius*radius;}
	void Show(){
		cout<<"x="<<getx()<<'t'<<"y="<<gety()<<'t'<<"radius="<<radius<<endl;//访问基类的数据成员
	}
	int position(Point &pt){
	double distance = sqrt((getx()-pt.getx())*(getx()-pt.getx())
		                    +(gety()-pt.gety())*(gety()-pt.gety()));
    double s=distance-radius;
	if(s==0) return 0;    //在圆上
	else if(s<0) return -1;					//在圆内
	else return 1;									//在圆外
	}
};
class Rectangle:public Point{
	double width,length;
public:
	Rectangle(){width=0; length=0; }
	Rectangle(double xv,double yv,double wv,double lv):Point(xv,xv)	{
		width = wv;
		length= lv;
	}
	Rectangle(Rectangle& rr):Point(rr){
		width = rr.width;
		length = rr.length;
	}
	double Area(){return width*length;}
	void Show(){
		cout<<"x="<<getx()<<'t'<<"y="<<gety()<<'t';
		cout<<"width="<<width<<'t'<<"length="<<length<<endl;
	}
	int position(Point &pt);
};
int Rectangle::position(Point &pt){
	double s1,s2;
	s1 = (pt.getx()-getx()); s2=(pt.gety()-gety());
	if(((s1==0||s1==width)&&s2<=length)||((s2==0||s2==length)&&s1<=width)) return 0; //在矩形上
	else if(s1<width&&s2<length) return -1;					//在矩形内
	else return 1;									//在矩形外
}
int main(){
	Circle cc1(3,4,5),cc2,cc3(cc1);
	Rectangle rt1(0,0,6,8),rt2,rt3(rt1);
	Point p1(0,0),p2(6,8),p3(3,3),p4(8,4),p5(8,8);
	cc1.Show();
	cc2.Show();
	rt1.Show();
	rt2.Show();
	cout<<"点p1:";
	p1.Show();
	cout<<"矩形rt3:"<<'t';
	rt3.Show();
	switch(rt3.position(p1)){
	case 0:cout<<"在矩形上"<<endl;break;
	case -1:cout<<"在矩形内"<<endl;break;
	case 1:cout<<"在矩形外"<<endl;break;
	}
	cout<<"圆cc3:"<<'t';
	cc3.Show();
	switch(cc3.position(p1)){
	case 0:cout<<"在圆上"<<endl;break;
	case -1:cout<<"在圆内"<<endl;break;
	case 1:cout<<"在圆外"<<endl;break;
	}
	cout<<"点p2:";
	p2.Show();
	cout<<"矩形rt3:"<<'t';
	rt3.Show();
	switch(rt3.position(p2)){
	case 0:cout<<"在矩形上"<<endl;break;
	case -1:cout<<"在矩形内"<<endl;break;
	case 1:cout<<"在矩形外"<<endl;break;
	}
	cout<<"圆cc3:"<<'t';
	cc3.Show();
	switch(cc3.position(p2)){
	case 0:cout<<"在圆上"<<endl;break;
	case -1:cout<<"在圆内"<<endl;break;
	case 1:cout<<"在圆外"<<endl;break;
	}
	cout<<"点p3:";
	p3.Show();
	cout<<"矩形rt3:"<<'t';
	rt3.Show();
	switch(rt3.position(p3)){
	case 0:cout<<"在矩形上"<<endl;break;
	case -1:cout<<"在矩形内"<<endl;break;
	case 1:cout<<"在矩形外"<<endl;break;
	}
	cout<<"圆cc3:"<<'t';
	cc3.Show();
	switch(cc3.position(p3)){
	case 0:cout<<"在圆上"<<endl;break;
	case -1:cout<<"在圆内"<<endl;break;
	case 1:cout<<"在圆外"<<endl;break;
	}
	cout<<"点p4:";
	p4.Show();
	cout<<"矩形rt3:"<<'t';
	rt3.Show();
	switch(rt3.position(p4)){
	case 0:cout<<"在矩形上"<<endl;break;
	case -1:cout<<"在矩形内"<<endl;break;
	case 1:cout<<"在矩形外"<<endl;break;
	}
	cout<<"圆cc3:"<<'t';
	cc3.Show();
	switch(cc3.position(p4)){
	case 0:cout<<"在圆上"<<endl;break;
	case -1:cout<<"在圆内"<<endl;break;
	case 1:cout<<"在圆外"<<endl;break;
	}
	cout<<"点p5:";
	p5.Show();
	cout<<"矩形rt3:"<<'t';
	rt3.Show();
	switch(rt3.position(p5)){
	case 0:cout<<"在矩形上"<<endl;break;
	case -1:cout<<"在矩形内"<<endl;break;
	case 1:cout<<"在矩形外"<<endl;break;
	}
	cout<<"圆cc3:"<<'t';
	cc3.Show();
	switch(cc3.position(p5)){
	case 0:cout<<"在圆上"<<endl;break;
	case -1:cout<<"在圆内"<<endl;break;
	case 1:cout<<"在圆外"<<endl;break;
	}
	return 0;
}

						