How to compare two floats?

[Cathey, Jim]

Unless you need the enhance dynamic range abilities of
floating point, you shouldn't be using it at all.  That's
just a general principle.  Devcie temperatures are well
handled by fixed-point (integer) routines.

-- Jim

-----Original Message-----
From: busybox [mailto:busybox-bounces at busybox.net] On Behalf Of bifferos
Sent: Sunday, May 24, 2015 4:05 AM
To: Lauri Kasanen; busybox at busybox.net
Subject: Re: How to compare two floats?

Thanks for all the responses to this, it's given me some ideas.


regards,
Biff.

>________________________________
> From: Lauri Kasanen <curaga at operamail.com>
>To: busybox at busybox.net 
>Sent: Sunday, 24 May 2015, 8:40
>Subject: Re: How to compare two floats?
> 
>
>> On Saturday 23 May 2015 21:41:51 bifferos wrote:
>> > I'm trying to write a thermostat using busybox shell, however the only way I
>> > could think to compare two float temperatures (without adding awk) was to
>> > multiply them up in dc and then compare as integers. In the end I modified
>> > dc to add a comparison operator, which probably breaks the spirit of dc
>> > somewhat.  I'm interested if I missed a trick somewhere.  Is there another
>> > way to do this?  Is this considered a heinous thing to do to dc?
>
>a - b
>
>Then you check if the sign is negative, using the shell's string ops.
>
>- Lauri
>
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