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