C++ point类 求矩形面积及两点距离

/* Name:矩形 Author: 张祥文 Time ：20120831 Beta 1.0 */ #include<iostream> #include<math.h> using namespace std; class Point { public: Point(float xx=0,float yy=0); //构造函数 double Distance(Point a,Point b); float GetX(){return X;} float GetY(){return Y;} ~Point(){}; //析构函数 private: float X,Y;//两点变量 }; class Rectangle { public: Rectangle(Point mm,Point nn);//构造函数 float Area();//求矩形面积函数 private: Point p1; Point p2; }; //构造函数定义 Point::Point(float xx,float yy) { X=xx; Y=yy; } Rectangle::Rectangle(Point mm,Point nn) { p1=mm; p2=nn; } //求两点间距离函数定义 double Point::Distance(Point p1,Point p2) { double distance; distance=sqrt((p1.X-p2.X)*(p1.X-p2.X)+(p1.Y-p2.Y)*(p1.Y-p2.Y));//两点间距离公式 return distance; } //计算面积函数定义 float Rectangle::Area() { float area,x,y; x=p1.GetX()-p2.GetX(); y=p1.GetY()-p2.GetY(); area=x*y; //求矩形面积 return area; } int main() { float x1,x2,y1,y2,Rec_area; cout<<"请输入矩形左上角的点坐标 :"<<endl; cin>>x1>>y1; //输入点坐标 cout<<"请输入矩形右上角的点坐标:"<<endl; cin>>x2>>y2; //输入点坐标 Point p1(x1,y1); Point p2(x2,y2); Rectangle rectangle1(p1,p2);//矩形对象 Rec_area = rectangle1.Area();//调用求矩形面积函数 cout<<"The area is:"<<Rec_area<<endl; system("pause"); return 0; }