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.

Practical C Programming
By :

Practical C Programming
By:
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)
Preface
Working with Arrays
Managing Strings
Exploring Functions
Preprocessing and Compilation
Deep Dive into Pointers
File Handling
Implementing Concurrency
Networking and Inter-Process Communication
Sorting and Searching
Working with Graphs
Advanced Data Structures and Algorithms
Creativity with Graphics
Using MySQL Database
General-Purpose Utilities
Improving the Performance of Your Code
Low-Level Programming
Embedded Software and IoT
Applying Security in Coding
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