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 NaN

A NaN result occurs when the result of an operation is an undefined or an unrepresentable number.

Consider this equation: y = 1 / x. What is the value of y as x approaches zero from the positive side? It will become an infinitely large positive value. What then is the value of y as x approaches zero from the negative side? It will become an infinitely large negative value. Mathematically, this is called a discontinuity, which cannot be resolved. As we approach zero from either direction, the result is a value that will be infinitely different when we approach from one direction or the other (an infinitely large positive value or an infinitely small negative value). Therefore, division by zero is mathematically undefined. In the computer, the result is NaN.

NaNs also occur when the data types are real, but the result of the computation is a complex number, for example, the square root of a negative number or the logarithm of a negative number....