Re: [Jscheme-devel] (eq? 128 128) => #f

[Geoffrey K. <ge...@kn...>]

Never mind.  I should have tried eqv? too.  For the record:

JScheme:
(eq? 128 128)  => #f		;; 2^8
(eq? 127 127)  => #t
(eqv? 128 128)  => #t

PLT Scheme v207:
(eq? 1073741824 1073741824)  => #f	;; 2^30
(eq? 1073741823 1073741823)  => #t
(eqv? 1073741824 1073741824)  => #t

Geoffrey
--
Geoffrey S. Knauth | http://knauth.org/gsk

On Jun 17, 2004, at 06:50, Geoffrey Knauth wrote:

> I ran into this while calculating azimuths.
>
> > (eq? 180 180)
> #f
> > (= 180 180)
> #t
> > (eq? 0 0)
> #t
> > (eq? 1 1)
> #t
> > (eq? 2 2)
> #t
> > (eq? 3 3)
> #t
> > (eq? 180 180)
> #f
>
> After poking around, I found this:
>
> > (eq? 127 127)
> #t
> > (eq? 128 128)
> #f
> > (eq? -127 -127)
> #t
> > (eq? -128 -128)
> #f
>
> For now I'll use = instead of eq?.  I was just wondering if this was 
> documented.
>
> Geoffrey
> --
> Geoffrey S. Knauth | http://knauth.org/gsk
>
>
>
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