题目描述
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。
输入
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。
输出
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。
样例输入
4 0,0 1,1 1,1 2,3 2,3 4,5 0,1 1,0
样例输出
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) 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.
Point : (0, 0) is erased.
Point : (2, -1) is erased.
Point : (1, -2) is erased.
提示
Append Code
#include<iostream>
#include<string>
using namespace std;
class Point
{
friend class Line;
private:
double x;
double y;
public:
Point(double a=0,double b=0){x=a;y=b;cout<<"Point : ("<<x<<", "<<y<<") is created."<<endl;}
Point(const Point&p):x(p.x),y(p.y)
{
cout<<"Point : ("<<x<<", "<<y<<") is copied."<<endl;
}
~Point(){cout<<"Point : ("<<x<<", "<<y<<") is erased."<<endl;}
void show(){cout<<"Point : ("<<x<<", "<<y<<")"<<endl;}
};
class Line
{
private:
Point A;
Point B;
public:
Line(double x1,double y1,double x2,double y2):A(x1,y1),B(x2,y2)//调用Point(double a=0,double b=0)
{
cout<<"Line : ("<<A.x<<", "<<A.y<<") to ("<<B.x<<", "<<B.y<<") is created."<<endl;
}
//Line(Point C,Point D):A(C),B(D){cout<<"Line : ("<<A.x<<", "<<A.y<<") to ("<<B.x<<", "<<B.y<<") is created."<<endl;}
~Line(){cout<<"Line : ("<<A.x<<", "<<A.y<<") to ("<<B.x<<", "<<B.y<<") is erased."<<endl;}
void show()
{
cout<<"Line : ("<<A.x<<", "<<A.y<<") to ("<<B.x<<", "<<B.y<<")"<<endl;
}
Line(const Point &p,const Point &q):A(p),B(q)//调用Point(const Point&p)
{
cout<<"Line : ("<<A.x<<", "<<A.y<<") to ("<<B.x<<", "<<B.y<<") 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();
}