From: Christoph Rippel <crippel@...>
Date: 2001-03-30T08:58:57+09:00
Subject: [ruby-talk:13349] Re: A subtle Hash bug

> From: Christoph Rippel [mailto:crippel@primenet.com]
[...]
> the outcome of floating point division of 1 by +/-0.0 is either 
> Infinity or -Infinity and that they are different that just a 
> reflection of standard C double behavior. Not you can use 
> +/- Infinity as regular input and gets something sensible like
> 
> p Math.atan(1/-1.0)  # => -0.7853981634  a.k.a -Pi/4
> p Math.atan(1/1.0)   # => 0.7853981634
Em, try ...

p Math.atan(1/-0.0)  
p Math.atan(1/0.0)  
 

Christoph