#### Overview of this book

Used in everything from microcontrollers to operating systems, C is a popular programming language among developers because of its flexibility and versatility. This book helps you get hands-on with various tasks, covering the fundamental as well as complex C programming concepts that are essential for making real-life applications. You’ll start with recipes for arrays, strings, user-defined functions, and pre-processing directives. Once you’re familiar with the basic features, you’ll gradually move on to learning pointers, file handling, concurrency, networking, and inter-process communication (IPC). The book then illustrates how to carry out searching and arrange data using different sorting techniques, before demonstrating the implementation of data structures such as stacks and queues. Later, you’ll learn interesting programming features such as using graphics for drawing and animation, and the application of general-purpose utilities. Finally, the book will take you through advanced concepts such as low-level programming, embedded software, IoT, and security in coding, as well as techniques for improving code performance. By the end of this book, you'll have a clear understanding of C programming, and have the skills you need to develop robust apps.
Preface
Creativity with Graphics
Improving the Performance of Your Code
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# Finding whether a number is a palindrome

A palindrome number is one that appears the same when read forward and backward. For example, 123 is not a palindrome but 737 is. To find out whether a number is a palindrome, we need to split it into separate digits and convert the unit of the original number to hundred and the hundred to unit.

For example, pqr number will be called a palindrome number if pqr=rqp. And pqr will be equal to rqp only if the following is true:

p x 100 + q x 10 + r = r x 100 + q x 10 + p

In other words, we will have to multiply the digit in the unit place by 102 to convert it into the hundreds and convert the digit in the hundreds place to unit by multiplying it by 1. If the result matches the original number, it is a palindrome.

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