This folder contains source files for all of the examples given in Lecture 17, Wed Oct 31.employee.h, employee.cpp, hourly.h, hourly.cpp, salaried.h,salaried.cpp and main.cpp - demonstrates derived classes and the 	interactions with their base class.  Also demonstrates 	dynamic memory allocation and smart pointers, virtual 	functions, pure virtual functions, and abstract base 	classes.  The Makefile can be used to build the executable        derived_class from these source files.