Book Image

Learn C Programming

By : Jeff Szuhay
Book Image

Learn C Programming

By: Jeff Szuhay

Overview of this book

C is a powerful general-purpose programming language that is excellent for beginners to learn. This book will introduce you to computer programming and software development using C. If you're an experienced developer, this book will help you to become familiar with the C programming language. This C programming book takes you through basic programming concepts and shows you how to implement them in C. Throughout the book, you'll create and run programs that make use of one or more C concepts, such as program structure with functions, data types, and conditional statements. You'll also see how to use looping and iteration, arrays, pointers, and strings. As you make progress, you'll cover code documentation, testing and validation methods, basic input/output, and how to write complete programs in C. By the end of the book, you'll have developed basic programming skills in C, that you can apply to other programming languages and will develop a solid foundation for you to advance as a programmer.
Table of Contents (33 chapters)
Section 1: C Fundamentals
Section 2: Complex Data Types
Section 3: Memory Manipulation
Section 4: Input and Output
Section 5: Building Blocks for Larger Programs

Understanding function scope

The scoping rules for functions are considerably simpler than for variables. Function declarations are very similar to external variable declarations. As we have variables that must be declared before they can be accessed, functions must be declared or prototyped before they can be called, and—like external variables—function declarations also have a file scope. They can be called anywhere within a source file after they have been prototyped or defined.

We have already seen how we can define functions in such a way that prototypes are not needed. We simply define them before they are ever called. Most often, however, it is far more convenient to simply declare function prototypes at the beginning of source files. When this is done, functions can be called from anywhere within the file, and there is no need to worry about whether a function has been declared before calling it.

To make functions extend beyond their compilation...