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Re: big number printout
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From: |
Marijn Schouten (hkBst) |
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Subject: |
Re: big number printout |
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Date: |
Wed, 02 Jul 2008 23:22:27 +0200 |
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User-agent: |
Thunderbird 2.0.0.14 (X11/20080620) |
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Ludovic Courtès wrote:
> Hi,
>
> "Bill Schottstaedt" <address@hidden> writes:
>
>> Not sure this is a bug, but it is confusing:
>>
>> guile> (version)
>> "1.8.5"
>> guile> (+ 40816513889983671.0 3.0)
>> 40816513889983700.0
>
> You're exceeding the precision of a float or double (whichever is used
> for reals):
>
> guile> 40816513889983671.0
> 40816513889983700.0 <--- rounded up
> guile> 40816513889983671
> 40816513889983671 <--- integers are not rounded
>
> FWIW, Bigloo and Ikarus behave similarly, and I don't think there's much
> that can be done.
As I understand it, Bill's test shows that the internal representation does not
lose any precision, even though the exterior representation (the printed value)
is inaccurate. I don't understand how that fits with your explanation.
Marijn
- --
Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML
<http://www.gentoo.org/proj/en/lisp/>, #gentoo-{lisp,ml} on FreeNode
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