Book Image

Practical C Programming

By : B. M. Harwani
Book Image

Practical C Programming

By: B. M. Harwani

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.
Table of Contents (20 chapters)

Applying assertions for validation

In this recipe, we will learn how to implement validation using assertion. The program will ask the user to enter the information of the passengers that are flying from one place to another. Using assertions, we can ensure that the number of passengers entered is a positive number. If the number of passengers entered is zero or a negative value, the program will abort.

How to do it...

Follow these steps to create a validation check using assertion. The recipe will not allow the program to run if the value of the number of passengers is zero or negative:

  1. The user is prompted to enter how many passengers are flying:
printf("How many passengers ? ");