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

Getting information about characters

The next thing we might want to do to individual characters has to do with figuring out what kind of character it is. Given a character from an input source, we may want to determine one or more of the following properties of that character:

  • Is it a control character?
  • Is it whitespace? (that is, does it include SPACE, TAB, LF, CR, VT, or HT?)
  • Is it a digit or a letter?
  • Is it in uppercase or not?
  • Is it even ASCII?

Now, reflecting on the four groups of ASCII characters and how they are laid out, you might consider how you would write functions to test these properties. For instance, to see whether a character is a decimal digit, you could write the following:

bool isDigit( int c )  {
bool bDigit = false;
if( c >= '0' && c <= '9' )
bDigit = true;
return bDigit;

This function checks to see whether the value of the...