I think the direct answear to your question is to use a reference to your base class:
Try smth like:
Base::SomeBaseFunction(..);
or I forgot( damn havent used C++ lately)
there might be pointer:
base->baseFunction();
anyway if you know the name of the base class, you can always make a pointer to it and call functions, however look out for virtual functions!!
Looks like you are in C++ class
)
and looks like this staff is new for you!
just go and find as much info on C++ as you can, it will save you much time on later assignments!