Description

在數學上，平面直角坐標系上的點用X軸和Y軸上的兩個坐標值唯一確定?，F在我們封裝一個“Point類”來實現平面上的點的操作。

根據“append.cc”，完成Point類的構造方法和show()方法，輸出各Point對象的構造和析構次序。

接口描述：
Point::show()方法：按輸出格式輸出Point對象。

Input

輸入多行，每行為一組坐標“x,y”，表示點的x坐標和y坐標，x和y的值都在double數據范圍內。

Output

輸出每個Point對象的構造和析構行為。對每個Point對象，調用show()方法輸出其值：X坐標在前，Y坐標在后，Y坐標前面多輸出一個空格。每個坐標的輸出精度為最長16位。輸出格式見sample。

C語言的輸入輸出被禁用。

Sample Input

1,2 3,3 2,1

Sample Output

Point : (0, 0) is created. Point : (1, 2) is created. Point : (1, 2) Point : (1, 2) is erased. Point : (3, 3) is created. Point : (3, 3) Point : (3, 3) is erased. Point : (2, 1) is created. Point : (2, 1) Point : (2, 1) is erased. Point : (0, 0) is copied. Point : (1, 1) is created. Point : (0, 0) Point : (1, 1) Point : (0, 0) Point : (1, 1) is erased. Point : (0, 0) is erased. Point : (0, 0) is erased.

HINT

思考構造函數、拷貝構造函數、析構函數的調用時機。

Append Code

#include<iostream> #include<iomanip> using namespace std; class Point { private: ????double x,y; public: ????Point(){x=0,y=0;cout<<setprecision(16)<<"Point : (0, 0) is created.\n";} ????Point(double a,double b){x=a,y=b;cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created.\n";} ????void show(){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<")\n";} ????~Point(){cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is erased.\n";} ????Point(Point &a){x=0,y=0;cout<<setprecision(16)<<"Point : (0, 0) is copied.\n";} ????Point(int a){x=a,y=a;cout<<setprecision(16)<<"Point : ("<<x<<", "<<y<<") is created.\n";} }; int main() { ????char c; ????double a, b; ????Point q; ????while(std::cin>>a>>c>>b) ????{ ????????Point p(a, b); ????????p.show(); ????} ????Point q1(q), q2(1); ????q1.show(); ????q2.show(); ????q.show(); }

轉載于:https://www.cnblogs.com/TogetherLaugh/p/6544632.html

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