Public virtual function derived private in C++

Question

I was trying to figure out what happens when a derived class declares a virtual function as private. The following is the program that I wrote

#include 

        

Answer 1

This is well-defined behavior. If a were a B* this wouldn't compile. The reason is that member access is resolved statically by the compiler, not dynamically at run-time. Many C++ books suggest that you avoid coding like this because it confuses less experienced coders.