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

Debugging with the preprocessor

So, we have seen two instances of using the preprocessor effectively: for #include files and limiting redundant processing of #include files. The last simple and effective use for the preprocessor is as a tool for debugging large and/or complex programs of multiple files.

Using the conditional directives, we can easily control what source code is inserted into the source file or excluded from the source file. Consider the following directives:

// code to be inserted and executed in final program
fprintf( stderr, "This is a test. We got here.\n" );

If the TEST_CODE macro is defined and has a nonzero value, the statements within the #if and #endif directives will be included in the source file. For this code to be included, we can define the macro in a couple of ways. First, it can be defined in the main source file with the following code:

#define TEST_CODE 1

This statement...