第十一週項目3-点類派生直線類

/*
 *Copyright  (c)  2014,         
 *All rights reserved.
 *    : test.cpp
 *          :   
 *    :2015   5   18  
 *   :v1.0
 */
#include <iostream>
#include <iomanip>
#include <cstring>
#include <cmath>
using namespace std;
class Point //      
{
public:
    Point():x(0),y(0) {};
    Point(double x0, double y0):x(x0), y(y0) {};
    double getx();
    double gety();
    void PrintPoint(); //      
protected:
    double x,y;   //         
};
void Point::PrintPoint()
{
    cout<<"Point: ("<<x<<","<<y<<")";    //   
}
class Line: public Point   //           ,                
{
public:
    Line(Point pts, Point pte); //    ，                        
    double Length();    //          
    void PrintLine();   //              
private:
    Point pts,pte;   //       ， Point               
};
double Point::getx()
{
    return x;
}
double Point::gety()
{
    return y;
}
void Line::PrintLine()
{
    cout<<"1st Point is:";
    pte.PrintPoint();
    cout<<"
2nd Point is:";
    pts.PrintPoint();
    cout<<'
'<<"Line'length:";
    cout<<Length()<<endl;
}
Line::Line(Point ts, Point te):Point((ts.getx()+te.getx())/2,(ts.gety()+te.gety())/2)
{
    pte=te;
    pts=ts;
}
double Line::Length()
{
    double l;
    l=sqrt((pts.getx()-pte.getx())*(pts.getx()-pte.getx())+(pts.gety()-pte.gety())*(pts.gety()-pte.gety()));
    return l;
}
int main()
{
    Point ps(-2,5),pe(7,9);
    Line l(ps,pe);
    cout<<"About the Line: "<<endl;
    l.PrintLine();  //    l   ：      
    cout<<"The middle point of Line is: ";
    l.PrintPoint(); //    l     
    return 0;
}