Omitting If

Examples:

(a) Were I you, I wouldn't do that.
(b) Had I known, I would have told you.
(c) Should anyone call, please take a message.

With were, had (past perfect), and should, sometimes if is omitted and the subject and verb are inverted.
In (a): Were I you = If I were you
In (b): Had I known = If I had known
In (c): Should anyone call = If anyone should call


Cheers!
Naeem