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

Introducing variables

A variable is a location in memory that holds a value of a specified type that can vary over the life of the variable, identified by its name. When the variable is defined with both a type and an identifier, its life begins. It can hold the same value throughout its life or it can be modified or overwritten with a new value of that type. The variable's life ends—that is, the memory it identifies is deallocated—when the block in which it was declared ends. We'll talk more about variable lifetimes in Chapter 25, Understanding Scope.

So, a variable is a memory location with an identifier (name) associated with a type that contains a value. The following three components are essential:

  • A unique identifier or name
  • A type
  • A value

The variable should always have some known starting value, even if it is 0; this is called initialization. If we don't give the variable an initial...