Question

Is it possible for a member function of a class to activate another member function of the same class?

Answer 1

Yes it is possible for a member function of a class to activate another member function of the same class.

Answer 2

Yes, inside the same class any function or method can also access any other function or method no matter whether it is public or private.

Even public as well as private really only handles what can access it outside of that class.

The body of a member function is analyzed after the class declaration due to the members of that class can be used in the member function body.