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

The char type and ASCII

ASCII was based on older standards and was developed around the same time that C was invented. It consists of 128 character values, which can be represented with a single signed char value. The lowest valid ASCII value is 0 and the highest valid ASCII value is 127 (there's that off-by-one thing again that we first saw in Chapter 7, Exploring Loops and Iteration). Each value in this range has a single, specific character meaning.

When we talk specifically about a C character (such as a control character, a digit, an uppercase letter, a lowercase letter, or punctuation), we are really talking about a single byte value that is correlated to a specific position in the character set.

Any unsigned char property that has a value greater than 127 or any signed char property that has a value that is less than 0 is not a valid ASCII character. It may be some other kind of character, possibly part of a non-standard ASCII extension or...