[Areading314]

The best C book is the Kernighan + Ritchie book "The C programming language", hands down. This is also one of the best books on practical computer science available today. Other books could help to provide a more modern take on how to adapt the language to 2020, but the original K+R book is still the best way to really learn the language.

[_l4jh]

I've been programming in C for twenty years now and K&R has a special place in my heart however I do not think it is the best book for a beginner to learn C.

If you're coming from COBOL and wanting to learn C (like the target audience at the time the book was written) ok perhaps it is a good book for you. But if you're coming from something like Python or Java or JavaScript (or even no language at all) there are better options such as K N King's A Modern Approach.

K&R is a fantastic book in its own right and I certainly think once you feel more comfortable with C it is a superb book to read and more importantly complete as many of the exercises as you can.

It is that I have seen too many people come from higher level languages or with no programming knowledge and find K&R frustrating due to its assumption the reader is already a programmer in some other (1970s) language with a fundamental understanding of some programming concepts.

[bluetomcat]

K&R is a worthy historical artifact on its own, documenting the then prevailing programming styles and problems of interest, and the overall cultural vibe of the programming community back then. It just takes you back to the creative and somewhat unorderly 1970s atmosphere in Bell labs, with its former hippies now wearing big glasses and colourful sweaters.

[runbsd]

Working at Bell Labs in the 70s/80s must have been interesting.

[runbsd]

Thanks, this is really useful info for someone who wants to learn C coming from Pyhon, etc.

[saagarjha]

I think it’s a great book to read first; it is concise and correct and gives a very good idea of what C is about. However, I would immediately follow it up with the newer parts of C, going more into the modern definition of undefined behavior, practices to keep your code correct in larger applications, how to debug issues, etc.

[pjmlp]

Only for historical reasons, it is full of examples of bad practices regarding safe C code by modern standards.

[Koshkin]

But C is “bad practice” (by design, and I mean it in a good sense).

[pjmlp]

Ideally C should be avoided as much as possible outside kernel code.

However it has gotten so deep into IT infrastructure, thanks to the hegemony of UNIX/POSIX clones, that even if starting today no more greenfield software would be written in C, and its copy-paste compatible languages, Objective-C and C++, it would take generations to clean it up and it would never be 100% replaced, as proven by mainframe environments and their languages.

So for the use cases where C isn't going away no matter what, we should strive for newer generations to improve their code quality and not to repeat bad practices from the past.

[nine_k]

Do people still use the K&R style of declarations?

OTOH a microcontroller is an acceptable approximation of a PDP-11, so much of the old approaches are very directly applicable.

[sureshv]

The 2nd edition circa 1988 uses ANSI style declarations.

[pjmlp]

And has never been updated ever since. Latest standard revision is ISO C17.

[Koshkin]

Thank god. I’d hate to see the book grow to a thousand pages.

[pjmlp]

On the other side it is full with outdated information and examples that lead to unsafe C code, not much to be happy about.

[saagarjha]

Name one from the second edition? I found the book’s examples to be fairly timeless.

[Koshkin]

I am sensing a confusion. Syntax has nothing to do with applicability to microcontrollers.

[nine_k]

Yes. But the general approach does.

If you drop down to C on x64, you likely deeply care about cache efficiency, pipelines not stalling, etc.