CHAPTER 3
AN INTRODUCTION TO FUNCTIONS

This chapter finishes our tutorial introduction to C. We focus on user-defined functions, showing how we can define simple functions and use them to improve upon our earlier interest rate programs. Along the way, we cover function definitions, function calls, function prototypes, and function return values. We also introduce the process of compiling programs that contain functions defined in multiple source files. Finally, we demonstrate how using functions leads to more readable and maintainable programs, and we discuss how to test the functions we've written. By this chapter's end, you should feel comfortable constructing programs from functions you write yourself.

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1. WRITING OUR OWN FUNCTIONS
   • Creating Functions
   • Calling Functions
   • Return Values
   • Providing Function Prototypes
   • Functions without Return Values
   • Ignoring Function Return Values
   • Functions without Parameters
2. SEPARATE COMPILATION
   • Recompiling When Fixing Mistakes
   • Reusing Object Modules
   • Support for Testing Functions
3. SOME ADDITIONAL FEATURES OF FUNCTIONS

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