Bit Hack - Round off to multiple of 8

Question

can anyone please explain how this works (asz + 7) & ~7; It rounds off asz to the next higher multiple of 8.

It is easy to see that ~7 produces 11111000 (8bit repre

Answer 1

Well, the mask would produce an exact multiple of 8 by itself. Adding 7 to asz ensures that you get the next higher multiple.