final commit for chapter 15 exercises with nsarray and nsmutable array
final commit for chapter 15 challenge no1, nsmutablearray with fast enumeration with a for loop
initial commit for proper name challenge for chapter 15
proper name challenge final commit
chapter 17 initial commit declaration of class Person, and example code setting the instance variables and using the class method
final commit for chapter 17 example of custom class declaration, as well as using properties, and synthesize to automate the declaration of accessor methods for the defined object
initial commit of the challenge for ch17
changed bodyMassIndex function
final commit for chapter17 challenge
changed decimal notation to 2 places
added employee subclass
dunno