using namespace std;

class rectangle

        class point

        {

        public:

                void setx ( int x ) {itsx=x;}

                void sety ( int y ) {itsy=y;}

                int getx() const {return itsx;}

                int gety() const {return itsy;}

        private:

                int itsx;

                int itsy;

        };

        point GetUpLeft() const {return upleft;}

        point GetLowLeft() const {return lowerleft;}

        point GetUpRight() const {return upright;}

        point GetLowRight() const {return lowerright;}

 

        rectangle ( int top,int left,int bottom,int right );

        ~rectangle() {}

 

        int GetTop() const {return Top;}

        int GetLeft() const {return Left;}

        int GetBottom() const {return Bottom;}

        int GetRight() const {return Right;}

 

        void SetUpLeft() {upleft.setx ( Left ); upleft.sety ( Top );}

        void SetLowLeft() {lowerleft.setx ( Left ); lowerleft.sety ( Bottom );}

        void SetUpRight() {upright.setx ( Right ); upright.sety ( Top );}

        void SetLowRight() {lowerright.setx ( Right ); lowerright.sety ( Bottom );}

 

        void SetTop ( int top ) {Top=top;}

        void SetLeft ( int left ) {Left=left;}

        void SetRight ( int right ) {Right=right;}

        void SetBottom ( int bottom ) {Bottom=bottom;}

 

        int GetArear() const {int width=Right-Left; int height=Bottom-Top; return ( width*height );}

 

        point upleft;

        point lowerleft;

        point upright;

        point lowerright;

 

        int Top;

        int Left;

        int Bottom;

        int Right;

rectangle::rectangle ( int top,int left,int bottom,int right )

        Top=top;

        Left=left;

        Bottom=bottom;

        Right=right;

 

        upleft.setx ( Left );

        upleft.sety ( Top );

 

        upright.setx ( Right );

        upright.sety ( Top );

 

        lowerright.setx ( Right );

        lowerright.sety ( Bottom );

 

        lowerleft.setx ( Left );

        lowerleft.sety ( Bottom );

class point

        int GetArear ( rectangle &rec ) {return rec.GetArear();}

 

int main()

        rectangle date ( 40,50,60,80 );

        cout<<"左边为："<<date.GetLeft() <<endl;

        cout<<"下边为："<<date.GetBottom() <<endl;

        cout<<"左下的X坐标为："<<date.GetLowLeft().getx() <<endl;

        cout<<"左下的y坐标为："<<date.GetLowLeft().gety() <<endl;

        cout<<"矩形面积为:"<<date.GetArear() <<endl;

        cout<<"重新设置Left和Bottom值"<<endl;

        date.SetLeft ( 0 );

        date.SetBottom ( 100 );

        date.SetLowLeft();

        cout<<"左边为："<<date.GetLeft() <<endl;

        cout<<"下边为："<<date.GetBottom() <<endl;

        cout<<"左下的X坐标为："<<date.GetLowLeft().getx() <<endl;

        cout<<"左下的y坐标为："<<date.GetLowLeft().gety() <<endl;

        point pt;

        cout<<"矩形面积为:"<<pt.GetArear ( date ) <<endl;

        system ( "pause" );