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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
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Subject: Re: How to use a struct with qsort()?
Date: Wed, 23 Oct 2019 04:51:27 -0700
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already5chosen@yahoo.com writes:

> [...] floating-point rarely produces an exact equality.

Floating-point often produces an exact equality.  The problem is
it often doesn't produce equality when that is expected, and
sometimes vice versa.