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Date: Wed, 01 Oct 2008 18:47:46 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: Ada Recursion with strings
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Date: 2008-10-01T18:47:46+02:00
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Jean-Pierre Rosen schrieb:
> Adam Beneschan a écrit :
>> Yep, the advantage of that is that if the people who design the
>> Internet communication protocols suddenly decide that IP addresses are
>> going to use 9-bit bytes, all you have to do is change one constant,
>> rather than try to find all the 8's in your code and change them,
>> which is more error-prone.
>>
> Reminds me of an old advice explaining why named constants were better
> than numerical values. They took the example of Pi, saying it would make
>  maintenance easier "should the value of Pi change" :-)
> 

See ftp://pi.super-computing.org/README  for currently known
values to be used for Ada.Numerics.["03C0"].

In case you are wondering about the Perlish spelling of that
Ada constant, it is Ada.Numerics.π encoded for those of our computers
that cleanly represent characters using 7-bit bytes.  Which should
of course be the default representation by any modern engineering
standard. Who would build a keyboard having 16#110000# keys for
just one ancient constant?