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.\n";}
Point():x(0),y(0){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created.\n";}
Point(double a,double b):x(a),y(b){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created.\n";}
Point(const Point &q):x(q.x),y(q.y){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is copied.\n";}
~Point(){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is erased.\n";}
void show(){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<")\n";}
};
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<<"\nTest 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;
}