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Re: RFA/PATCH gtest - NSNumber float != double

From: Alexander Malmberg
Subject: Re: RFA/PATCH gtest - NSNumber float != double
Date: Wed, 22 Jan 2003 00:53:44 +0100

David Ayers wrote:
> Hmm, I'll take your word  for it.  I just recalled back in the dark ages
> someone told me (or I read it somewhere) that 25.1 would somehow be
> represented as 2.51 * 10^1 and that a float or double only stored the
> mantissa and exponent which shouldn't result in any discrepancies here.

It does, but in base 2, and the fraction 25.1/16 can't be represented
exactly in base 2; you get 2^4 * 1.10010 0011 0011 0011 ...

- Alexander Malmberg

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