Problem A: 平面上的点——Point类 (III)

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。现在我们封装一个“Point类”来实现平面上的点的操作。

根据“append.cc”，完成Point类的构造方法和show()方法，输出各Point对象的构造和析构次序。实现showPoint()函数。

接口描述：
showPoint()函数按输出格式输出Point对象，调用Point::show()方法实现。
Point::show()方法：按输出格式输出Point对象。

Input

输入多行，每行为一组坐标“x,y”，表示点的x坐标和y坐标，x和y的值都在double数据范围内。

Output

输出每个Point对象的构造和析构行为。showPoint()函数用来输出（通过参数传入的）Point对象的值：X坐标在前，Y坐标在后，Y坐标前面多输出一个空格。每个坐标的输出精度为最长16位。输出格式见sample。

C语言的输入输出被禁用。

Sample Input

1,2 3,3 2,1

Sample Output

Point : (0, 0) is created.

Point : (1, 2) is created.

Point : (1, 2) is copied.

Point : (1, 2)

Point : (1, 2) is erased.

Point : (1, 2) is erased.

Point : (3, 3) is created.

Point : (3, 3) is copied.

Point : (3, 3)

Point : (3, 3) is erased.

Point : (3, 3) is erased.

Point : (2, 1) is created.

Point : (2, 1) is copied.

Point : (2, 1)

Point : (2, 1) is erased.

Point : (2, 1) is erased.

Point : (0, 0) is copied.

Point : (1, 1) is created.

Point : (0, 0) is copied.

Point : (1, 1) is copied.

Point : (0, 0) is copied.

Point : (0, 0)

Point : (1, 1)

Point : (0, 0)

Point : (0, 0) is erased.

Point : (1, 1) is erased.

Point : (0, 0) is erased.

Point : (1, 1) is erased.

Point : (0, 0) is erased.

Point : (0, 0) is erased.

HINT

思考构造函数、拷贝构造函数、析构函数的调用时机。

Append Code

#include<iostream>
#include<iomanip>
using namespace std;
class Point
{
private:
    double x,y;
public:
    Point(double a):x(a),y(a){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created. ";}
    Point():x(0),y(0){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created. ";}
    Point(double a,double b):x(a),y(b){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created. ";}
    Point(const Point &q):x(q.x),y(q.y){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is copied. ";}
    ~Point(){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is erased. ";}
    void show(){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") ";}
};
void showPoint(Point p){p.show();}
void showPoint(Point q,Point w,Point e){q.show();w.show();e.show();}
int main()
{
    char c;
    double a, b;
    Point q;
    while(std::cin>>a>>c>>b)
    {
        Point p(a, b);
        showPoint(p);
    }
    Point q1(q), q2(1);
    showPoint(q1, q2, q);
}
int main()
{
    cout<<"Static member test output :"<<endl;
    Time::displayNumber();
    Time t;
    t.displayNumber();
    Time tt(t);
    tt.displayNumber();
    Time ttt(1, 2, 3);
    ttt.displayNumber();
    Time tttt(ttt.getTime());
    tttt.displayNumber();
    int non_cases = Time::getNumber();

    cout<<" Test data output :"<<endl;
    int hour, minute, second;
    while(cin>>hour>>minute>>second)
    {
        Time t;
        t.setTime(hour, minute, second).showTime();
    }
    cout<<t.getNumber() - non_cases<<endl;
}