第十周实验报告1

#include<iostream>
#include<Cmath>
using namespace std;
class Point //定义坐标点类
{public:
double x,y;   //点的横坐标和纵坐标
Point(){x=0;y=0;}
Point(double x0,double y0) {x=x0; y=y0;}
void PrintP(){cout<<"Point:("<<x<<","<<y<<")";}
};
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
{private:
class Point pt1,pt2;   //直线的两个端点
public:
Line(Point pts, Point pte);  //构造函数
double Dx(){return pt2.x-pt1.x;}
double Dy(){return pt2.y-pt1.y;}
double Length();//计算直线的长度
void PrintL();  //输出直线的两个端点和直线长度
};
//构造函数，分别用参数初始化对应的端点及由基类属性描述的中点
Line::Line(Point pts, Point pte)
{
pt1 = pts;
pt2 = pte;
}

double Line::Length(){return sqrt(Dx()*Dx()+Dy()*Dy());};//计算直线的长度

void Line::PrintL()
{
cout<<" 1st ";
pt1.PrintP();
cout<<"\n 2nd ";
pt2.PrintP();
cout<<"\n The middle point of Line: ";
PrintP();
cout<<"\n The Length of Line: "<<Length()<<endl;
}
int main()
{
Point ps(-2,5),pe(7,9);
Line l(ps,pe);
l.PrintL(); //输出直线l的信息
l.PrintP();//输出直线l中点的信息
cout<<endl;
system("pause");
return 0;
}
运行结果：

1st Point:(-2,5)
2nd Point:(7,9)
The middle point of Line: Point:(0,0)
The Length of Line: 9.84886
Point:(0,0)
请按任意键继续. . .