219: Highlights

• Inadvertent member-variable references and assignments via the class-member operator can destroy your effort to practice data abstraction.
• You can prevent inadvertent direct access to member variables by moving their declarations into the private part of the class definition.
• Member functions in general, and constructors, readers, and writers in particular, have complete access to all member variables, public and private.
• The member variables and member functions in the public part of a class definition constitute the class's public interface.
• The public–private dichotomy helps to ensure that you can benefit from data abstraction.