What's the difference between friendship and inheritance?

Question

Suppose there are two classes A and B:

class A {};
class B {};

In what aspects differ the two examples below?

Example 1:

Answer 1

In the context you're using, to answer your question to the best of my ability, friends simply allow your classes to share protected/private data, while inheritance will do the same, except there'll be a deeper relationship, where the classes are one in the same (such as with casting).