Problem A: 一切皆对象 （C++期末）

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Problem B: 一切皆对象

Time Limit: 1 Sec   Memory Limit: 128 MB
Submit: 685   Solved: 350
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Description

一切都是对象 —— Everything is an object。 所以，现在定义一个类Thing，来描述世界上所有有名字的事物。该类只有构造函数、拷贝构造函数和析构函数，并具有一个字符串数据成员来存储其名字。

Input

输入只有1行，是一个没有空白符的字符串。

Output

见样例。

Sample Input

NAME

Sample Output

A thing without name is created!
A thing without name is copied!
A thing named by NAME is created!
A thing named by NAME is copied!
A thing named by NAME is erased!
A thing named by NAME is erased!
A thing without name is erased!
A thing without name is erased!

HINT

Append Code

append.cc, 、

int main() 
{ 
    string name; 
    Thing Thing1, Thing2(Thing1); 
    cin>>name; 
    Thing Thing3(name); 
    Thing Thing4(Thing3); 
    return 0; 
}

代码如下：

#include <iostream> 
#include <iomanip> 
#include <string> 
#include<cstring> 
using namespace std; 
class Thing 
{ 
private: 
    string name; 
public: 
    Thing() 
    { 
        name = "without name"; 
        cout<<"A thing without name is created!"<<endl; 
    } 
    Thing(string _name) 
    { 
        name = _name; 
        cout<<"A thing named by "<<name<<" is created!"<<endl; 
  
    } 
    Thing(Thing &t) 
    { 
        name=t.name; 
        if(name=="without name") 
          cout<<"A thing "<<name<<" is copied!"<<endl; 
        else
             cout<<"A thing named by "<<name<<" is copied!"<<endl; 
    } 
    ~Thing() 
    { 
        if(name=="without name") 
          cout<<"A thing "<<name<<" is erased!"<<endl; 
        else
            cout<<"A thing named by "<<name<<" is erased!"<<endl; 
    } 
}; 
int main() 
{ 
    string name; 
    Thing Thing1, Thing2(Thing1); 
    cin>>name; 
    Thing Thing3(name); 
    Thing Thing4(Thing3); 
    return 0; 
}