QUIZ 2

1. Describe the concept separating interface from implementation.
   • Easier to modify programs
   • Hints about other implementation; private members
   • Header files
     • Class definitions and function prototypes
     • Included in each file using class; #include
     • File extension .h
   • Source-code files
     • Member function definitions
     • Same base name; Convention
     • Compiled and linked
2. What are the utility functions? Compare with access functions.
   Not all member functions need be made public to serve as part of the interface of the class.
   • Access functions in public
     • Read/display data
     • Predicate functions
     • Check conditions
     • Utility functions (helper functions)
   • Utility functions in private
     • Support operation of public member functions
     • Not intended for direct client use
3. Write a code fragment to show Utility function demonstration. (see Fig 1)

   Figure 1: SalesPerson class definition

   
4. Describe the Software Reusability as a OOP concept.
   • Class libraries
     • Well-defined
     • Carefully tested
     • Well-documented
     • Portable
     • Widely available
   • Speeds development of powerful, high-quality software
     • Rapid applications development (RAD)
   • Resulting problems
     • Cataloging schemes
     • Licensing schemes
     • Protection mechanisms