Problem B: 平面上的点和线——Point类、Line类 (III)
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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。
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 : (1, 1) is created.Line : (0, 0) to (1, 1) is created.Line : (0, 0) to (1, 1)Line : (0, 0) to (1, 1) is erased.Point : (1, 1) is erased.Point : (0, 0) is erased.=========================Point : (1, 1) is created.Point : (2, 3) is created.Line : (1, 1) to (2, 3) is created.Line : (1, 1) to (2, 3)Line : (1, 1) to (2, 3) is erased.Point : (2, 3) is erased.Point : (1, 1) is erased.=========================Point : (2, 3) is created.Point : (4, 5) is created.Line : (2, 3) to (4, 5) is created.Line : (2, 3) to (4, 5)Line : (2, 3) to (4, 5) is erased.Point : (4, 5) is erased.Point : (2, 3) is erased.=========================Point : (0, 1) is created.Point : (1, 0) is created.Line : (0, 1) to (1, 0) is created.Line : (0, 1) to (1, 0)Line : (0, 1) to (1, 0) is erased.Point : (1, 0) is erased.Point : (0, 1) is erased.=========================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) i
s 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.Point : (0, 0) is erased.Point : (2, -1) is erased.Point : (1, -2) is erased.
#include <iostream>using namespace std;class Point{public: 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; }};class Line{private: Point x; Point y;public: Line(double x1,double y1,double x2,double y2):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.x1 = p.x1; x.y1 = p.y1; y.x1 = q.x1; y.y1 = q.y1; cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is created."<<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::cout<<"=========================\n"; std::cin>>x1>>c>>y1>>x2>>c>>y2; Line line(x1, y1, x2, y2); line.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();}
s 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.Point : (0, 0) is erased.Point : (2, -1) is erased.Point : (1, -2) is erased.
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- Problem B: 平面上的点和线——Point类、Line类 (III)
- Problem B: 平面上的点和线——Point类、Line类 (III)
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- Problem F: 平面上的点和线——Point类、Line类 (VI)
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