#include <iostream>
using namespace std;
 class test
{
    public:
        int a;
        test() : a(0){}
        test &operator*(){
            cout << "operator*" << endl;
            cout << a << endl;
            return *this;
        }
};
 
 int main()
{
    test *t;
    t = new test;
    test t2 = *t;
    t->a += 1;
    // t2.a += 1;
    *t = *t2;
    *t;    // 這一行     *t2;    //      **t;    // 注意*t 和 **t這兩個的差別
    return 0;
}