That guy has written more than 40 books according to Wikipedia - quantity over quality, I suppose. I wonder how he justifies having 9 editions for "Let Us C". It's almost as if he is doing solely to be able to force students to buy the new version (as opposed to the used version in the university bookstore).
Your profile looks interesting. I too am passionate about programming and have been dabbeling into LISP for some time. Where can I find your contact info ?
http://www.ksetindia.com/books/let-us-c
Ironically this book is quite popular with students in Indian Universities (I guess mainly due to ignorance)
Even the wikipedia page for the author admits this fact
http://en.wikipedia.org/wiki/Yashavant_Kanetkar