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

Declaring the pointer type

A pointer is a variable. Therefore, it has a type and an identifying name. It is distinguished as a pointer at declaration with the * notation.

The syntax for a pointer is type * identifier;, where type is either an intrinsic type or a custom type, * indicates a pointer to the given type, and identifier is the name of the pointer variable. The actual type of a pointer variable is not just type, but type*. This is what distinguishes a direct variable from an indirect variable.

A pointer must have a type for the thing it points to. A pointer type can be any intrinsic type (such as int, long, double, char, byte, and so on) or any already-defined custom type (such as an array, struct, typedef, and so on). The pointer's value (an address) can be any named location (the variable identifier) that has that type. We will see why this is essential when we access the value at the pointer's address.

An example of an integer pointer...