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Class objects inherit member
variables from the class to which they belong, and from all that class's
superclasses. Each box_car object, for example, has its own copy of
every member variable declared in the box_car, box,
container, and railroad_car classes.
Similarly, class objects
inherit member functions from the class to which they belong, and
from all that class's superclasses. You can, for example, work on a
box_car object not only with member functions defined in the
box_car class, but also with those defined in the box,
container, and railroad_car classes, if any.