CS202   3- ‹#›
Single Inheritance
nWe specify in the derived class which class is to be its parent. It is this parent's members that are then inherited by the derived class.
nSaying class derived : public base establishes a single inheritance hierarchy.
nThe keyword public specifies that all public members of the base class remain public in the derived class.
nThis is called public derivation and is how we specify an "is a" relationship between two classes.