#include<iostream>
#include<string.h>
using namespace std;
class A{
public:
    A(char* username) {
        cnt++;
        cout << cnt << endl;
        name = new char[strlen(username)];
        strcpy(name,username);
        cout << username << endl;
    }
    A(const A& cp) {
        /*name = new char[strlen(cp.name)];
        strcpy(this->name,cp.name);*/
        name = cp.name;
        cout << cnt << endl;
        cout << "this name is "<< this->name << "\t" << cp.name << endl;
    }
    A& operator= (const A& cp) {
        name = cp.name;
        cout << "this name is "<< this->name << "\t" << cp.name << endl;
    }
    ~A() {
        delete name;
        name = NULL;
    }
private:
    static int cnt;
    char* name;
};
int A::cnt = 0;
int main()
{
    A test1("nihao");
    A test2(test1);
    A test3 = test1;
    test3 = test2;
    return 0;
}