#include<iostream>
#include<Cmath>
using namespace std;
class Point //定義坐标點類
{
public:
Point():x(0),y(0) {};
Point(double x0, double y0):x(x0), y(y0) {};
void PrintPoint(); //輸出點的資訊
double get_X();
double get_Y();
protected:
double x,y; //點的橫坐标和縱坐标
};
void Point::PrintPoint()
{
cout<<"Point: ("<<x<<","<<y<<")"<<endl; //輸出點
}
class Line: public Point //利用坐标點類定義直線類, 其基類的資料成員表示直線的中點
{
public:
Line(Point pts, Point pte); //構造函數,用初始化直線的兩個端點及由基類資料成員描述的中點
double Length(); //計算并傳回直線的長度
void PrintLine(); //輸出直線的兩個端點和直線長度
private:
class Point pts,pte; //直線的兩個端點,從Point類繼承的資料成員表示直線的中點
};
double Point::get_X()
{
return x;
}
double Point::get_Y()
{
return y;
}
Line::Line(Point p1,Point p2):Point((p1.get_X()+p2.get_X())/2,(p1.get_Y()+p2.get_Y())/2)
{
pts=p1;
pte=p2;
}
double Line::Length()
{
double d1,d2,d;
d1=pts.get_X()-pte.get_X();
d2=pts.get_Y()-pte.get_Y();
d=sqrt(d1*d1+d2*d2);
return d;
}
void Line::PrintLine()
{
cout<<" 1st:";
pts.PrintPoint();
cout<< "2nd:";
pte.PrintPoint();
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(); //輸出直線l的資訊:兩端點及長度
cout<<"The middle point of Line is: ";
l.PrintPoint(); //輸出直線l中點的資訊
return 0;
}
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIiclRnblN0LclHdpZXYyd2LcBzNvwVZ2x2bzNXak9CX90TQNNkRrFlQKBTSvwFbslmZvwFMwQzLcVmepNHdu9mZvwFVywUNMZTY18CX052bm9CX9MGVORTVE9keFpWTmZEWjZXUYpVd1kmYr50MZV3YyI2cKJDT29GRjBjUIF2LcRHelR3LcJzLctmch1mclRXY39zNyYDO1UTMzEDOxUDM1EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
學習總結:感覺好事不太熟練,思路時好時壞,這樣真的不好!!!