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Let us c 17th edition
What is C? C is a programming language developed at AT & T’s Bell Laboratories of USA in 1972 by Dennis Ritchie.
C became popular because it is simple and easy to use. An opinion that is often heard today is—“C has been already superseded by languages like C++, C#, and Java, so why bother to learn C today”. I seriously beg to differ with this opinion.
There are several reasons for this. These are as follows:(a) C++, C#, or Java makes use of a principle called Object Oriented Programming (OOP) to organize programs that offer many advantages.
While using this organizing principle, you need basic programming skills. So it makes more sense to first learn C and then migrate to C++, C# orJava.
Though this two-step learning process may take more time, in the end of it, you will definitely find it worth the trouble.
(b) Major parts of popular operating systems like Windows, UNIX, Linux, and Android are written in C. Moreover, if one is to extend the operating system to work with new devices, one needs to write device driver programs.
These programs are written exclusively in C.(c) Common consumer devices like microwave ovens, washing machines, and digital cameras are getting smarter by the day. This smartness comes from a microprocessor, an operating system, and a program embedded in these devices.
These programs have to run fast and work with a limited amount of memory. C is the language of choice while building such operating systems and programs. (d) You must have seen several professional 3D computer games where the user navigates some object, like say a spaceship, and fires bullets, at invaders.
The essence of all such games is speed. To match this expectation of speed, the game has to react fast to the user inputs.
The popular gaming frameworks (like DirectX) that are used for creating such games are written in C. I hope that these are very convincing reasons why you should adopt C as the first step in your quest for learning programming.
Getting Started with C There is a close analogy between learning the English language and learning the C language. This is illustrated in Figure 1.1.
Let Us C has become an important part of my life. I have created and nurtured it for the last two decades. While doing so, I have received, in addition to compliments, a lot of suggestions from students, developers, professors, publishers, and authors.
So much have their inputs helped me in taking this book up to its seventeenth edition that ideally, I should put their names too on the cover page.
In particular, I am indebted to Manish Jain who had a faith in this book idea, believed in my writing ability, whispered words of encouragement, and made helpful suggestions from time to time. I hope every author gets a publisher who is as cooperative, knowledgeable, and supportive as Manish.
The previous editions of this book saw several changes and facelifts. During this course, many people helped in executing programs and spotting bugs.
I trust that with their collective acumen, all the programs in this book would run correctly. I value the work that they did a lot. Any errors, omissions, or inconsistencies that remain are, alas, my responsibility.
I thank all my family members for enduring the late nights, the clicking keyboard, and mostly for putting up with a marathon book effort.
Thinking of a book cover idea is one thing, putting it into action is a different cup of tea. This edition’s cover idea has been implemented by VinayIndoria. Many thanks to him!And finally my heartfelt gratitude to the countless students who made me look into every nook and cranny of C. I want to remain in their debt.
It is only because of them that Let Us C is now published in India, Singapore, the USA, Japan, Dubai, Korea, and China in multiple languages.PrefaceLet Us C has been part of learning and teaching material in most Engineering and Science Institutes round the country for years now.
From last year or so, I received several suggestions that its size is pruned a bit, as many learners who learn the C language in their Engineering or Science curriculum has some familiarity with it.
I am happy to fulfill this request. I hope the readers would appreciate the lean look of the current edition. In one of the previous editions I had realigned the chapters in such a manner that if a C programming course is taught using Let Us C, it can be finished in 22 lectures of one hour each, with one chapter’s contents devoted to one lecture.
I am happy that many readers liked this idea and reported that this has made their learning path trouble-free. A more rational reorganization of end-of-chapter Exercises in the book has also been well-received. Riding on that feedback I introduced one more feature in the fifteenth edition—KanNotes.
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