Re: A pettiness question.

[Vadim Lobanov <vlobanov@speakeasy.net>]

On Wed, 21 Sep 2005, Nick Warne wrote:

> >> This give a enum of {0,1}. If test is not 0, !!test will give 1,
> >> otherwise 0.
> >>
> >> Am I right?
> >
> > Yes.  I think of it as a "truth value" predicate (or operator).
>
> Interesting.  I thought maybe this way was trick, until later I experimented.
>
> My post here (as Bill Stokes):
>
> http://www.quakesrc.org/forums/viewtopic.php?t=5626
>
> So what is the reason to doing !!num as opposed to num ? 1:0 (which is more
> readable I think, especially to a lesser experienced C coder).  Quicker to
> type?

Some people also prefer the following form:
	num != 0

> My quick test shows compiler renders both the same?
>
> Nick
> --
> "When you're chewing on life's gristle,
> Don't grumble, Give a whistle..."
> -

-Vadim Lobanov