How to test if float is NaN?

[Lionello Lunesu]

Don Clugston wrote:
> Lionello Lunesu wrote:
>> Since by definition a NaN is not equal to anything, including itself, 
>> I suppose it's a compiler bug?
> 
> Definitely. I've seen that sort of behaviour before in VC++.
> <cynic> Does anyone at Microsoft understand floating point arithmetic? 
> </cynic>

I must mention that I have the unstable floating point optimizations 
turned on, /fp:fast.. I'll have to try the default before trashing the 
VC team ;)

L.