stack(TYPE)
 This class provides a generic (parameterized) data abstraction for a
 fixed-sized stack of objects of some given type.

 Before a stack can be declared or implemented, the base class, a
 vector with the same type parameter, must also be declared or
 implemented.

vector(TYPE)
 This class provides the (parameterized) data abstraction for a
 fixed-sized vector of objects of some given type.