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

Understanding the block scope of variables

We have already seen several instances of block scope. Function bodies consist of a block beginning with { and ending with }. Complex statements such as conditional statements and looping statements also consist of one or more blocks beginning with { and ending with }. Finally, it is possible to create an unnamed block anywhere with any other block that begins with { and ends with }. C is very consistent in its treatment of blocks, regardless of where they appear.

Variables declared within a block are created, accessed, and modified within that block. They are deallocated and are no longer accessible when that block completes; the space they occupied is gone, only to be reused by something else in the program.

When you declare and initialize variables within a function, those variables are visible to all statements within that function until the function returns or the final } is encountered. Upon completion of the block...