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NNTP-Posting-Date: Thu, 12 Aug 2010 05:57:32 -0500
From: Brian Drummond <brian_drummond@btconnect.com>
Newsgroups: comp.lang.ada
Subject: Re: Efficiency of code generated by Ada compilers
Date: Thu, 12 Aug 2010 12:04:56 +0100
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Date: 2010-08-12T12:04:56+01:00
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On Thu, 12 Aug 2010 00:54:52 -0700, csampson@inetworld.net (Charles H. Sampson)
wrote:

>Simon Wright <simon@pushface.org> wrote:
>
>> csampson@inetworld.net (Charles H. Sampson) writes:
>> 
>> >      I then overloaded "+" and "-" for (Bearing, Turn_Angle) arguments
>> > and Bearing return value.  In those functions is where the mod 360
>> > occurred.  (Actually, mod 360.0, as it were.)
>> 
>> Depending on what is doing the turning, in our application that would
>> in some cases have to be mod 720.0 ...
>
>     I'm puzzled.  Unless you're very careful, intermediate calculations
>could result in a quasi-Bearing of more than 360 degrees but I'm pretty
>sure most programmers on my project would have been surprised to see a
>real bearing of 360 degrees or more.

Some applications must distinguish between odd and even revolutions.
Get it wrong and they might backfire.

- Brian