Re: How to check a Float for NaN

On Apr 30, 1:33 pm, Jerry <lancebo...@[EMAIL PROTECTED]
> 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 im****t 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.  You'll probably be OK if you use a 64-bit float type (probably
Long_Float).  But if you want to test a 32-bit float type, I don't see
a C function that works on 32-bit floats, and doing an Ada type
conversion is very likely to fail---probably cause a processor fault
when the compiler generates a floating-point conversion instruction
and the processor then faults because you gave it a NaN as an
instruction operand.

                               -- Adam