© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022
M. KalinModern C Up and Runninghttps://doi.org/10.1007/978-1-4842-8676-0_1

1. Program Structure

Martin Kalin1  
(1)
Chicago, IL, USA
 

1.1 Overview

This chapter focuses on how C programs are built out of functions, which are a construct in just about all modern program languages. The chapter uses short code segments and full programs to explain topics such as these:

  • Functions as program modules

  • Control flow within a program

  • The special function named main

  • Passing arguments to a function

  • Returning a value from a function

  • Writing functions that take a variable number of arguments

C distinguishes between function declarations, which show how a function is to be called, ...

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