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)

Time Limit: 1 Sec   Memory Limit: 128 MB

Submit: 5254  

Solved: 2627

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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。

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

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 : (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.

HINT

Append Code

append.cc,

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#include <iostream>
using namespace std;
class Point
{
private:
    double x,y;
public:
    Point(){x = 0;y = 0; cout << "Point : (" << x << ", " << y <<") is created." << endl;}
    Point(double xx ,double yy ){ x = xx; y = yy; cout << "Point : (" << x << ", " << y <<") is created." << endl;}
    Point (const Point &p)
 {
     x = p.x;
     y = p.y;
     cout << "Point : (" << x << ", " << y <<") is copied." << endl;
 }
    double getX() const {return x;}
    double getY() const {return y;}
   void setXY(double x1,double y2)
   {
       x = x1,y = y2;
   }
    void show()
    {
        cout << "Point : (" << x  << ", "<< y << ")" <<endl;
    }
    ~Point ()
  {
      cout << "Point : (" << x << ", " << y <<") is erased." << endl;
  }
};
class Line
{
private :
    Point st,ed;
public:
   Line():st(0,0),ed(0,0){cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is created." << endl;}
   Line( Point &sst, Point &eed):st(sst),ed(eed)
    {
 
      cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is created." << endl;
    }
    Line(Line & line):st(line.st),ed(line.ed){ cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is copied." << endl; }
    Line & setLine(const Line &pt)
    {
      st = pt.st;
      ed = pt.ed;
      return *this;
    }
     Line & setLine( Point &sst, Point &eed)
    {
      st = sst;
      ed = eed;
      return *this;
    }
    void readLine()
    {
        double x1,y1,x2,y2;
        char ch ;
        cin >> x1 >>ch >>y1>> x2 >> ch >>y2;
        st.setXY(x1,y1);
        ed.setXY(x2,y2);
    }
    void show() const
    {
         cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" <<endl;
    }
    ~Line()
    {
       cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is erased." << endl;
    }
};
 
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();
}