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

External static storage

Because an internal static variable can only be initialized by the compiler, we need another mechanism to safely store a value that we might want to initialize, or seed, ourselves. For this, we can use an external static variable.

External static variables can only be accessible by any other variable or code block, including function blocks, within the file where it is declared. Ideally, then, the code for the external static variable and the function that accesses it should be in a single, separate .c file, as follows:

// seriesGenerator.c 

static int seriesNumber = 100; // default seed value

void seriesStart( int seed ) {
seriesNumber = seed;

int series( void ) {
return series++;

To use these functions, we would need to include a header file with function prototypes for it, as follows:

// seriesGenerator.h

void seriesStart( int seed );
int series( void );

We would create the seriesGenerator.c and seriesGenerator...