Problem E: 平面上的点和线——Point类、Line类 (V)-布布扣-bubuko.com

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。

Line::SetLine(double, double, double, double)方法：设置Line对象起点的x,y坐标（第一个和第二参数）和终点的x,y坐标（第三个和第四个坐标），并返回本对象

Line::SetLine(const Point &, const Point &)方法：设置Line对象的起点（第一个参数）和终点（第二个坐标），并返回本对象

Line::SetLine(const Line&)方法：设置Line对象，复制参数的坐标，并返回本对象

Line::readLine()方法：从标准输入上读入坐标，格式见Sample

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 : (1, -2) is copied. Point : (2, -1) is copied. Line : (1, -2) to (2, -1) is copied. Line : (1, -2) to (2, -1) Line : (1, -2) to (2, -1) 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 (2, -1) is erased. Point : (2, -1) 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
{
friend class Line;
private:
    double st,ed;
public:
    Point():st(0),ed(0){cout << "Point : (" <<st<< ", " <<ed<<") is created." << endl;}
    Point(double stt ,double edd ):st(stt),ed(edd){cout << "Point : (" <<st<< ", " <<ed<<") is created." << endl;}
    Point (const Point &p)
    {
        st = p.st;
        ed= p.ed;
        cout << "Point : (" << st<< ", " << ed<<") is copied." << endl;
    }
     
    double x() const {return st;}
    double y() const {return ed;}
    void show()
    {cout << "Point : (" <<st<< ", "<<ed<< ")" <<endl;}
    ~Point ()
    {cout << "Point : (" <<st<< ", " <<ed <<") is erased." << endl;}
};
class Line
{
friend class Point;
private :
    Point st_,ed_;
public:
Line():st_(0,0),ed_(0,0)
{
  cout << "Line : (" << st_.x() << ", " << st_.y()<< ") to (" <<ed_.x() <<", " << ed_.y() << ")" << " is created." << endl;
}
 
Line( Point &sst, Point &eed):st_(sst),ed_(eed)
    { cout << "Line : (" << st_.x() << ", " << st_.y()<< ") to (" <<ed_.x() <<", " << ed_.y() << ")" << " is created." << endl;}
Line(double x1,double y1,double x2,double y2):st_(x1,y1),ed_(x2,y2)
    {
   cout << "Line : (" << st_.x() << ", " << st_.y()<< ") to (" <<ed_.x() <<", " << ed_.y() << ")" << " is created." << endl;
    }
void show() const
    {cout << "Line : (" << st_.x() << ", " << st_.y()<< ") to (" <<ed_.x() <<", " << ed_.y() << ")" <<endl;
    }
~Line()
    { cout << "Line : (" << st_.x() << ", " << st_.y()<< ") to (" <<ed_.x() <<", " << ed_.y() << ")" << " is erased." << endl;}
Line(const Line &l):st_(l.st_),ed_(l.ed_)
    {cout << "Line : (" << st_.x() << ", " << st_.y()<< ") to (" <<ed_.x() <<", " << ed_.y() << ")" << " is copied." <<endl;}
 
 
Line setLine(double x1,double y1,double x2,double y2)
{
    st_.st=x1;
    st_.ed=y1;
    ed_.st=x2;
    ed_.ed=y2;
    return *this;}
Line &setLine(const Point &p  ,const Point &q)
{
    st_=p;
    ed_=q;
    return *this;
}
Line &setLine(const Line &p)
{
    st_=p.st_;
    ed_=p.ed_;
    return *this;
}
 
void readLine()
{
  double x1,y1,x2,y2;
  char in;
  cin>>x1>>in>>y1>>x2>>in>>y2;
    st_.st=x1;
    st_.ed=y1;
    ed_.st=x2;
    ed_.ed=y2;
 
}};
 
int main()
{
    int num, i;
    Point p(1, -2), q(2, -1), t;
    t.show();
    std::cin>>num;
    Line line[num];
    for(i = 0; i < num; i++)
    {
        line[i].readLine();
        line[i].show();
    }
    Line l1(p, q), l2(p,t), l3(q,t), l4(l1);
    l1.show();
    l2.setLine(l1).show();
    l3.show();
    l4.setLine(t,q).show();
}

Problem E: 平面上的点和线——Point类、Line类 (V)

Problem E: 平面上的点和线——Point类、Line类 (V)

Description

Input

Output

Sample Input

Sample Output