Chapter 9. FUNCTIONS

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You will learn about the following in this chapter:

Keyword
```
 return 
```
Operators
```
 * (unary) & (unary) 
```

In this chapter, you learn about functions: how to define them, how to use arguments and return values, and how to use pointer variables as function arguments. You find out about function types, ANSI C prototypes , and recursion.

How do you organize a program? C's design philosophy is to use functions as building blocks. You've already relied on the standard C library for functions such as printf() , scanf() , getchar () , putchar () , and strlen() . Now you're ready for a more active role: creating your own functions. You've previewed several aspects of that process in earlier chapters, and this chapter consolidates your earlier information and expands on it.

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