Re: !!, what is it?

Flash Gordon wrote:
>
> Cafer Å?imÅ?ek wrote:
[...]
> > I think, C standarts says something about logical operations resusts;
> > if the result is false, it's value is 0 (zero). if the result is true,
> > it's value is non-zero (like -2, -1, 2, 3, ...). So, it must NOT be
> > one. This difference has seen according to compiler or target
> > platform.
>
> Incorrect. The result of any logical operator is *always* 0 or 1 and
> this is defined by the standard. What probably has you confused is that
> any non-zero value will act as true, so all the values you quote will
> act as true. However, I repeat, the boolean operators will never return
> any value other than 0 or 1 on *any* implementation.
[...]

Well, any C89 or later, I assume. I've worked on platforms (prior to
1989) where boolean expressions were 0 or -1.

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