Is it an assignment on OOP theory? First of all, you need to understand when the virtual method table is generated and how are those tables mapped on the types and their members. You will be able to count those pointers (pointless business in practice, but might be a fair device to check up your understanding), if you learn how VMT (vtable) works. For example, after reading and understanding of this article:
http://en.wikipedia.org/wiki/Virtual_method_table[
^].
Good luck,
—SA