Class name does not name a type in C++

Question

I just started programming in C++, and I\'ve tried to create 2 classes where one will contain the other.

File A.h:

#ifndef _A_h
#define          


        

Answer 1

when you define the class A, in A.h, you explicitely say that the class has a member B.

You MUST include "B.h" in "A.h"