Demo: Virtual Function in Virtual Base Hierarchy

Expected three outputs: GiantPanda::locate()
GiantPanda::locate()
GiantPanda::locate()
GiantPanda::locate()

Expected three outputs: Bear::locate()
Bear::locate() dominates ZooAnimal::locate()
(*** for explanation, see the demo ``dominate.c'' ***)

Bear::locate()
Bear::locate()
Bear::locate()