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

Exploring visibility

The visibility of a variable is largely determined by its location within a source file. There are a number of places a variable can appear, which determines its visibility. Some of these we have already explored. The following is a comprehensive listing of types of visibility:

  • Block/local scope: This occurs in function blocks, conditional statement blocks, loop statement-body blocks, and unnamed blocks. These are also called internal variables. The visibility of variables declared in this scope is limited to the boundaries of the block where they are declared.
  • Function parameter scope: Even though this scope occurs in function parameters, the function parameters are actually within the block scope of the function body.
  • File scope: These are also called external variables. A variable declared outside any function parameter or block is visible to all other functions and blocks in that file.
  • Global scope: When...