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

Explicitly typed constants

C provides a safer means of declaring named constants, other than by using the preprocessor. This is done by adding the constkeyword to a variable declaration. This sort of declaration must be of the const type identifier = value;form, where type, identifier, and value are the same as in our preceding variable declaration form—except here, the initializing value is not optional. The constant variable loses its ability to change after the statement is evaluated. If we don't give it a value when we declare it, we cannotdo so later. Such a declaration without an initializing value is, therefore, useless.

When we declare a constant in this manner, it is named; it has a type and it has a value that does not change. So, our previous example becomes as follows:

const float kInchesPerFoot = 12.0;
const float kFeetPerYard = 3.0;

feet = inches / kInchesPerFoot;
yards = feet / kFeetPerYard;

This is considered safer because...