Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: A must-have book!

I've got a few C-programming books, but this is the one that I love best of all. It is a gem of a book that resonates with simple, crystal-clear explanations on topics so seemingly difficult to understand in the classic book by Kernighan and Ritchie. I would recommend using these two books together.What makes this book even more entertaining and readable is that Perry is not afraid to lay on his idiosyncrasies regarding the practice of programming. There is a little hiccup, though, when he recommends the use of gets() and sscanf() together for nearly all input of strings from the terminal: gets() is widely known to be inferior to fgets(), and sscanf() is not discussed in the book at all!But all in all, a book that deserves full marks.