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)

Reversing a string using pointers

In this recipe, we will learn to reverse a string using pointers. The best part is that we will not reverse the string and copy it onto another string, but we will reverse the original string itself.

How to do it…

  1. Enter a string to assign to the str string variable as follows:
printf("Enter a string: ");
scanf("%s", str);
  1. Set a pointer to point at the string, as demonstrated in the following code. The pointer will point at the memory address of the string's first character:
  1. Find the length of the string by initializing an n variable to 1. Set a while loop to execute when the pointer reaches the null character of the...