The C in Objective-C
In this chapter, we will introduce the main concepts common to the Objective-C and C languages. Objective-C is based on the original C language. As a result of this special relationship, any program that is valid C code is also valid from Objective-C's perspective. This is why it is so important to be familiar with the basics of C, as well as how they relate to areas of object oriented programming, such as classes, messages, and interfaces.