#include <iostream>

#include <fstream>

#include <vector>

#include <algorithm>

using namespace std;

class A{

public:

    A(){

        a = ;

    }

    int a;

};

class B :public A{

public:

    B(){

        a = ;

    }

    int a;

};

int main(){

    B b ;

    B *pb = &b;

    A* pa = &b;

    printf("a in B is: %d\n", pb->a);

    printf("a in A is: %d\n", pa->a);

    printf("value of pb is: %p\n", pb);

    printf("value of pa is: %p\n", pa);

    printf("address of pb->a is: %p\n", &(pb->a));

    printf("address of pa->a is: %p\n", &(pa->a));

    return ;

}