Few lesser known tricks, quirks and features of C

There are some tricks, quirks and features (some quite fundamental to the language!) which seems to throw even experienced developers off the track. Thus I did a sloppy job of gathering some of them in this post (in no particular order) with even sloppier short explanations and/or examples (or quote of thereof). Array pointers Comma operator Digraphs, trigraphs and alternative tokens Designated in