Re: [q-lang-users] [Chicken-users] Re: IEEE float arithmetic

[Thomas C. <ch...@we...>]

On Wed, 21 Jun 2006, John Cowan wrote:

> Abdulaziz Ghuloum scripsit:
>
>> Out of curiosity, why not simply do "f==1.0/0.0 || f==-1.0/0.0" to test
>> if f is +inf.0/-inf.0?
>
> Umm.  Too obvious, I guess.  I started working these out in
> Chicken, where dividing by zero throws an exception, so I
> wanted some other method.  But in C, of course, there's no
> such issue. [...]

Hello,

are you sure this works on every architecture? I dimly recall having seen 
systems where NaN != NaN holds, so you have to use the isnan predicate 
function from the C math library...

cu,
Thomas