第11周项目3—点类派生直线类

来源：互联网发布：opt算法c语言代码编辑：程序博客网时间：2024/05/22 08:05
#include<iostream>#include<Cmath>using namespace std;class Point //定义坐标点类{public:    Point():x(0),y(0) {};    Point(double x0, double y0):x(x0), y(y0) {};    double getx();    double gety();    void PrintPoint(); //输出点的信息protected:    double x,y;   //点的横坐标和纵坐标};double Point::gety(){    return y;}double Point::getx(){    return x;}void Point::PrintPoint(){    cout<<"Point: ("<<x<<","<<y<<")";    //输出点}class Line: public Point   //利用坐标点类定义直线类, 其基类的数据成员表示直线的中点{public:    Line(Point pts, Point pte); //构造函数，用初始化直线的两个端点及由基类数据成员描述的中点    double Length();    //计算并返回直线的长度    void PrintLine();   //输出直线的两个端点和直线长度private:    class Point pts,pte;   //直线的两个端点，从Point类继承的数据成员表示直线的中点};Line::Line(Point pts1, Point pte1):Point((pts1.getx()+pte1.getx())/2,(pts1.gety()+pte1.gety())/2){pts=pts1;pte=pte1;}double Line::Length(){    return sqrt((pts.getx()-pte.getx())*(pts.getx()-pte.getx())+(pts.gety()-pte.gety())*(pts.gety()-pte.gety()));}void Line::PrintLine(){    cout<<"1st Point:("<<pts.getx()<<","<<pts.gety()<<")"<<endl;    cout<<"2st Point:("<<pte.getx()<<","<<pte.gety()<<")"<<endl;    cout<<"The Length of Line: "<<Length()<<endl;}int main(){    Point ps(-2,5),pe(7,9);    Line l(ps,pe);    cout<<"About the Line: "<<endl;    l.PrintLine();  //输出直线l的信息：两端点及长度    cout<<"The middle point of Line is: ";    l.PrintPoint(); //输出直线l中点的信息    return 0;}
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