Quote Originally Posted by mistu4u View Post
So what is the best book do you think which can challenge "Let Us C"?
I haven't read it myself, but a lot of "newbies" on the board seem to benefit much from Brian Kernighan and Dennis Ritchie's book:

The C Programming Language - Wikipedia, the free encyclopedia

and if those people are any indication it seems to encourage good style and provide a lot of well designed, challenging exercises.