#include<iostream>

using namespace std;

class A

{

public:

    int x;

    int sayhello()

    {

        cout<<"hello world"<<endl;

    }

};

class B:public A

{

};

typedef int A::*int_pointer;

typedef int (A::*FP)();

int main()

{

    int A::*pointer1 = &A::x;

    int_pointer pointer2 = &A::x;

    A a;

    a.*pointer1 = ;

    ++(a.*pointer2);

    cout << &a->*pointer1 << endl;

    B b;

    a.sayhello();

    int (A::*classAfunctionpointer1)();

    classAfunctionpointer1 = &A::sayhello;

    FP classAfunctionpointer2 = &A::sayhello;

    (a.*classAfunctionpointer1)();

    (a.*classAfunctionpointer2)();

    (&a->*classAfunctionpointer1)();

    (b.*classAfunctionpointer1)();

    return ;

}