Problem A: 你会定义类吗？

Description

定义一个类Demo，有构造函数、析构函数和成员函数show()，其中show()根据样例的格式输出具体属性值。该类只有一个int类型的成员。

Input

输入只有一个整数，int类型范围内。

Output

见样例。

Sample Input

-100

Sample Output

A data 10 is created!

A data 0 is created!

A data -100 is created!

This is data 10

This is data 0

This is data -100

A data -100 is erased!

A data 0 is erased!

A data 10 is erased!

HINT

Append Code

int main()

{

    Demo tmp(10), tmp2;

    intd;

    cin>>d;

    Demo tmp3(d);

 

    tmp.show();

    tmp2.show();

    tmp3.show();

    return0;

}

#include <iostream>using namespace std;class Demo{private :    int x;public:    Demo(int y = 0)    {        cout<<"A data "<<y<<" is created!"<<endl;        x = y;    }    void show()    {        cout<<"This is data "<<x<<endl;    }    ~Demo()    {        cout<<"A data "<<x<<" is erased!"<<endl;    }};