Re: 0.3-0.2=0.999999999998?

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#16321

From: Chris Ruml
Date: Wed, 10 Mar 1999 00:00

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Rene wrote:

[snip]

> The result is surprising, because 0.1 does not seem to equal 0.3-0.2,
> which can be checked by 0.3-0.2==0.1 (resulting in false). This is
> again correct with proper rounding in base 2.

[snip]

This is why it was Programming 101 (give or take) that explained that one should
never use
                (double1 == double2)
to check equality of such inexact numeric values but rather
                (abs(double1-double2) < some_tolerance) .

Chris.

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From: Chris Ruml <cruml@medsweb.com>
Subject: Re: 0.3-0.2=0.999999999998?
Date: 1999/03/10
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