CS202 4- ‹#›
Static Binding
nUsing this account class hierarchy, whenever we need an account object we can use a checking, student, or savings object in its place.
nThis is because every checking, student, and savings object contains an account object.
nThis is the essential characteristic of a hierarchy.
nNotice that it does not work the other way around.
nWe cannot use an account object when we need a checking, student, or savings object because an account object does not have the necessary data members or member functions.
nIf we attempt to do that a compile error will result.