I am using Let us C by Yashwant Kanetkar from since 1998. Now I am a trainer of programming language and I recommend this book to my students. Tha language of the book is very simple as compared to other books. This book provides in-depth knowledge of C language.
In 1998, I have started C language training in Kanpur and I have come across in the Bookstore and I found it very interesting.
All the programming of the book is nicely written and explained. All the concepts covered in-depth and explained with a good example.
I like this book for its in-depth contents and exercise is very challenging for the students.