This book was writen by yashwant kanetkar he lives in india and studied computer software he wrotes alot of books on programming and also wrotes books for their solution so the book let us c is about c programming language in this book he tried to explain every topic in a good manner and try to write every topic in simple words also its solution is avalible in soft form in internet this is the perfect book for learning c programming I have read this book and gain alot of knowledge so I request you all to read this book if you want to learn c