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)

Reading a text file and converting all characters after the period into uppercase

Say we have a file that contains some text. We think that there is an anomaly in the text—every first character after the period is in lowercase when it should be in uppercase. In this recipe, we will read that text file and convert each character after the period (.) that is, in lowercase into uppercase.

In this recipe, I assume that you know how to create a text file and how to read a text file. If you don't know how to perform these actions, you will find programs for both of them in Appendix A.

How to do it…

  1. Open the sequential file in read-only mode using the following code:
    fp = fopen (argv [1],"r");