C Primer Plus, Fifth Edition

CHAPTER 9FUNCTIONS

You will learn about the following in this chapter:

• Keyword:

return

• Operators:

* (unary) & (unary)

• Functions and how to define them

• How to use arguments and return values

• How to use pointer variables as function arguments

• Function types

• ANSI C prototypes

• 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.

Reviewing Functions ...