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

Defining scope – visibility, extent, and linkage

Often, when thescopeof a variable or function is mentioned, it is referring only to the visibility of the variable or function. Visibility essentially determines which functions or statements can see the variable to either access it or modify it. If the variable is visible, it can be accessed and modified, except—as you may recall from Chapter 4, Using Variables and Assignment—when it is declared as aconst variable, it can only be accessed but cannot be changed. As we will see, visibility is but one component of a variable's scope. The other components of scope are extent (or the lifetime of the variable) and linkage (or in which file the variable exists).

The visibility, extent, and linkage of variables and functions depend upon where they are declared and how they are defined. However, regardless of how or where they are defined, they must be defined before they can be accessed. This is true for...