Re: How to check a Float for NaN

[Adam Beneschan <adam@irvine.com>]

On Apr 30, 4:23 pm, I wrote:
> On Apr 30, 1:33 pm, Jerry <lancebo...@qwest.net> wrote:
>
> > Thanks for the insight. From my point of view, not having access to
> > the all the IEEE-754 features is a nuisance. I'm not sure what I'm
> > going to do--probably try in import the C function isnan.
>
> Be careful with that, too.  On my (Pentium Linux) system, the man page
> for "isnan" says it takes a "double", which I think means a 64-bit
> float.

Ha, ha, ha, the man page lied.  Apparently (on my system) isnan is a C
macro (in <math.h>), which will call one of three routines depending
on the size of the float.  But since isnan is a macro, doing an Import
pragma on it is likely going to fail since "isnan" is not the name of
an actual routine in the library.  That's on my OS, though; who knows
how it works on yours.

Anyway, good luck and have fun getting this to work.

                               -- Adam