Problem B: 平面上的点和线——Point类、Line类 (II)

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 5701  Solved: 3888
[Submit][Status]

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。

Sample Input

4 0,0 1,1 1,1 2,3 2,3 4,5 0,1 1,0

Sample Output

Point : (0, 0) Line : (0, 0) to (1, 1) is created. Line : (0, 0) to (1, 1) Line : (0, 0) to (1, 1) is erased. Line : (1, 1) to (2, 3) is created. Line : (1, 1) to (2, 3) Line : (1, 1) to (2, 3) is erased. Line : (2, 3) to (4, 5) is created. Line : (2, 3) to (4, 5) Line : (2, 3) to (4, 5) is erased. Line : (0, 1) to (1, 0) is created. Line : (0, 1) to (1, 0) Line : (0, 1) to (1, 0) is erased. Line : (1, -2) to (2, -1) is created. Line : (1, -2) to (0, 0) is created. Line : (2, -1) to (0, 0) is created. 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. Line : (2, -1) to (0, 0) is erased. Line : (1, -2) to (0, 0) is erased. Line : (1, -2) to (2, -1) is erased.

#include <iostream>
using namespace std;
 
class Point
{
 public:
     double st,ed;
     Point(double stt,double edd):st(stt),ed(edd){}
     Point():st(0),ed(0){}
     void show(){cout<<"Point : ("<<st<<", "<<ed<<")"<<endl;}
     double x()const{return st;}
     double y()const{return ed;}
} ;
 
class Line
{
public:
    Point st_,ed_;
    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;}
    Line(const Point &stt,const Point &edd):st_(stt.x(),stt.y()),ed_(edd.x(),edd.y()){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;}
 
 
};
 
 
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;
    for(i = 1; i <= num; i++)
    {
        std::cin>>x1>>c>>y1>>x2>>c>>y2;
        Line line(x1, y1, x2, y2);
        line.show();
    }
    Line l1(p, q), l2(p, t), l3(q, t), l4(t, q);
    l1.show();
    l2.show();
    l3.show();
    l4.show();
}