It is still relevant due to the fact that K&R C is still extremely (but not completely) forward compatible with even the most modern c++ standards. Many softwa

It is still relevant due to the fact that K&R C is still extremely (but not completely) forward compatible with even the most modern c++ standards. Many software design best practices have changed since then, but if you read a more modern book some of the first principles of the C language will have to be either repeated or omitted by a modern book.