My K & R second edition is at my left hand. I just used it this morning to find a nifty way to stack ‘case :’ statements in the same line in order to make my switch statement readable. My first edition K & R is at home, retired.
I was just examining a copy of “21st Century C” on a colleagues desk. It does not mention Kernighan as a co-author. It does mention Ben Klemens as the author.
Sorry for the confusion: the book is “The Go Programming Language” by Alan A. A. Donovan & Brian W. Kerrigan (2016 Addison-Wesley).
“21st Century C” is only a moniker someone has given to the language...