Chapter 8 n Variable Data Types ow we're cooking! You may now consider yourself a C Programmer, First Class. At this point, you've mastered all the basic elements of C programming. You know that C programs are made up of functions, one--and only one!--of which is named main() . Each of these functions uses keywords (such as if , for , and while ), operators (such as = , ++ , and *= ), and variables to manipulate the program's data.