平面上的点和线——Point类、Line类 (IV)

Description

在数学上，平面直角坐标系上的点用X轴和Y轴上的两个坐标值唯一确定，两点确定一条线段。现在我们封装一个“Point类”和“Line类”来实现平面上的点的操作。
根据“append.cc”，完成Point类和Line类的构造方法和show()方法，输出各Line对象和Point对象的构造和析构次序。
接口描述：
Point::show()方法：按格式输出Point对象。
Line::show()方法：按格式输出Line对象。

Input

输入的第一行为N，表示后面有N行测试样例。
每行为两组坐标“x,y”，分别表示线段起点和终点的x坐标和y坐标，两组坐标间用一个空格分开，x和y的值都在double数据范围内。

Output

输出为多行，每行为一条线段，起点坐标在前终点坐标在后，每个点的X坐标在前，Y坐标在后，Y坐标前面多输出一个空格，用括号包裹起来。输出格式见sample。
C语言的输入输出被禁用。

Sample Input
40,0 1,11,1 2,32,3 4,50,1 1,0
Sample Output
Point : (1, -2) is created.Point : (2, -1) is created.Point : (0, 0) is created.Point : (0, 0)Point : (0, 0) is created.Point : (0, 0) is created.Line
 : (0, 0) to (0, 0) is created.Point : (0, 0) is created.Point : (0, 0) is created.Line : (0, 0) to (0, 0) is created.Point : (0, 0) is created.Point : (0, 0) is created.Line : (0, 0) to (0, 0) is created.Point : (0, 0) is created.Point : (0, 0) is created.Line
 : (0, 0) to (0, 0) is created.=========================Line : (0, 0) to (1, 1)=========================Line : (1, 1) to (2, 3)=========================Line : (2, 3) to (4, 5)=========================Line : (0, 1) to (1, 0)=========================Point : (1,
 -2) is copied.Point : (2, -1) is copied.Line : (1, -2) to (2, -1) is created.Point : (1, -2) is copied.Point : (0, 0) is copied.Line : (1, -2) to (0, 0) is created.Point : (2, -1) is copied.Point : (0, 0) is copied.Line : (2, -1) to (0, 0) is created.Point
 : (0, 0) is copied.Point : (2, -1) is copied.Line : (0, 0) to (2, -1) is created.Line : (1, -2) to (2, -1)Line : (1, -2) to (0, 0)Line : (2, -1) to (0, 0)Line : (0, 0) to (2, -1)Line : (0, 0) to (2, -1) is erased.Point : (2, -1) is erased.Point : (0, 0) is
 erased.Line : (2, -1) to (0, 0) is erased.Point : (0, 0) is erased.Point : (2, -1) is erased.Line : (1, -2) to (0, 0) is erased.Point : (0, 0) is erased.Point : (1, -2) is erased.Line : (1, -2) to (2, -1) is erased.Point : (2, -1) is erased.Point : (1, -2)
 is erased.Line : (0, 1) to (1, 0) is erased.Point : (1, 0) is erased.Point : (0, 1) is erased.Line : (2, 3) to (4, 5) is erased.Point : (4, 5) is erased.Point : (2, 3) is erased.Line : (1, 1) to (2, 3) is erased.Point : (2, 3) is erased.Point : (1, 1) is erased.Line
 : (0, 0) to (1, 1) is erased.Point : (1, 1) is erased.Point : (0, 0) is erased.Point : (0, 0) is erased.Point : (2, -1) is erased.Point : (1, -2) is erased.

#include <iostream>
using namespace std;
class Point
{
private:
    double x1,y1;
public:
    Point(double  xx1 = 0,double yy1 = 0)
    {
        x1 = xx1;
        y1 = yy1;
        cout<<"Point : ("<<x1<<", "<<y1<<") is created."<<endl;
    }
    void show()
    {
        cout<<"Point : ("<<x1<<", "<<y1<<")"<<endl;
    }
    ~Point()
    {
        cout<<"Point : ("<<x1<<", "<<y1<<") is erased."<<endl;
    }
    Point (const Point& p)
    {
        x1 = p.x1;
        y1 = p.y1;
        cout<<"Point : ("<<x1<<", "<<y1<<") is copied."<<endl;
    }
    double getx()
    {
        return x1;
    }
    double gety()
    {
        return y1;
    }
    void setx(double a,double b)
    {
        x1 = a;
        y1 = b;
    }
};
class Line
{
private:
    Point x;
    Point y;
public:
    Line(double x1 = 0,double y1 = 0,double x2 = 0,double y2 = 0):x(x1,y1),y(x2,y2)
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is created."<<endl;
    }
    ~Line()
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is erased."<<endl;
    }
    void show()
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<")"<<endl;
    }
    Line(const Point& p,const Point& q):x(p),y(q)
    { 
       cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is created."<<endl;
    }
    int SetLine(double a, double b, double c, double d)
    {
        x.setx(a,b);
        y.setx(c,d);
    }
};
int main()
{
    char c;
    int num, i;
    double x1, x2, y1, y2;
    Point p(1, -2), q(2, -1), t;
    t.show();
    std::cin>>num;
    Line line[num];
    for(i = 0; i < num; i++)
    {
        std::cout<<"=========================\n";
        std::cin>>x1>>c>>y1>>x2>>c>>y2;
        line[i].SetLine(x1, y1, x2, y2);
        line[i].show();
    }
    std::cout<<"=========================\n";
    Line l1(p, q), l2(p, t), l3(q, t), l4(t, q);
    l1.show();
    l2.show();
    l3.show();
    l4.show();
}