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From: "Staszek Goldstein" <goldstei@math.uni.lodz.pl>
Newsgroups: comp.lang.ada
Subject: Re: output and digits
Date: Wed, 20 Apr 2005 21:53:23 +0200
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Date: 2005-04-20T21:53:23+02:00
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Uzytkownik "Robert A Duff" <bobduff@shell01.TheWorld.com> napisal w 
wiadomosci news:wcc1x95361o.fsf@shell01.TheWorld.com...

>> This works (if you correct it slightly to integer(character'pos('I')) - 
>> pos
>> gives a universal integer!), but changing the order does not seem nice in 
>> a
>> language like Ada...
>
> Oops.  Yeah, 'Pos is what you want.  But you don't need the conversion
> to Integer.

You are right, the representation clause accepts *any* integer type, even 
universal integers, nevertheless I had to add
for Roman_Digit'size use 8;

otherwise it complained that the two converted types have different sizes 
and gave no visible output.

> Actually, it makes no sense to do arithmetic on roman numerals.
> So if I were doing this, I would have two functions, for converting
> integers to/from roman numerals represented as Strings.
> You only need roman numerals for I/O.  All internal processing
> can be done in integers.

I totally agree with this point of view. If fact, my roman numerals were 
given as an example only,
in real life I had problems with output of DNA sequences, which is a more 
serious matter.
Nevertheless, I feel quite satisfied now, after learning so many nice 
solutions to the problem...

Staszek