实验12：Problem A: 你会定义类吗？

Problem A: 你会定义类吗？

Problem A: 你会定义类吗？

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 556  Solved: 464
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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

append.cc,

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#include<iostream>
using namespace std;
class Demo{
public:
    int x;
    Demo(int a=0):x(a){cout<<"A data "<<x<<" is created!"<<endl;}
    ~Demo(){cout<<"A data "<<x<<" is erased!"<<endl;}
    void show(){cout<<"This is data "<<x<<endl;}
};
int main()
{
    Demo tmp(10), tmp2;
    int d;
    cin>>d;
    Demo tmp3(d);

    tmp.show();
    tmp2.show();
    tmp3.show();
    return 0;
}