made the follwing changes:
order.cpp:
Code:
#ifndef Order_H
#define Order_H
#include "Order.h"
#include "ISBN.h"
#endif
isbn.cpp:
Code:
#ifndef ISBN_H
#define ISBN_H
#include "ISBN.h"
#include "ISBNPrefix.h"
#endif
isbnprefix.cpp
Code:
#ifndef ISBNPrefix_H
#define ISBNPrefix_H
#include "ISBNPrefix.h"
#endif
also changed the class ISBN; in order.cpp
only thing i'm stuck on is the "using directive in headers", don't know what that is exactly
btw, i'm still getting the linker errors....and yes they are 13, but our prof said we'll only be using 10 digits