This chapter deals with the specifics of realising ADTs in C++ through
the new concept of CLASSES. The chapter introduces necessary
terminology and covers the fundamental stages of defining,
implementing and using classes.  Some initial guide- lines for good
class design are also provided.

The chapter follows three examples: a simple  Counter  class,  used  for
counting  the  occurrences  of  events, a Money class used to manipulate
values of pounds and pence, and a more complex Set  class  which  allows
programmers  to work with sets of characters and supports set operations
such as union and intersection.