复制深体验2

#include <iostream>
#include<cstring>

using namespace std;
class A
{
private:
char *a;
public:
A(char *aa)
{
a= new char[strlen(aa)+1];
strcpy(a,aa);
}
A( const A &obj)
{

a= new char[strlen(obj.a)+1];
strcpy(a,obj.a);
}
~A()
{
delete []a;
}
void output(){cout<<a<<endl;}
};

int main()
{
A a("good moring, code monkeys!");
a.output();
A b(a);
b.output();
return 0;
}