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From: Ted Dennison <dennison@telepath.com>
Subject: Re: Ada vs Delphi?
Date: 1999/08/16
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In article <37b54687.54956646@news.total.net>,
  aratel@total.net (Andre Ratel) wrote:

> Sorry, I should have mentioned this. In Delphi, a cardinal is defined
> as an unsigned 32-bit with range  0 .. 4294967295  whereas an
> integer is a signed 32-bit with range  2147483648 .. 2147483647.
> So, yes, cardinal is a completely different type and it contains 0.
...
> If I understand correctly, in Ada, some types have subtypes. So I
> could declare
>
>   N21: Integer;
>  n1, n2: Natural;
>
> and evaluate the expression
>
>   N21:= n2 - n1;
>
> without problem.

Exactly. The only hitch is that subtypes cannot have a greater range
than their base type. So Natural'last = Integer'last. If you want to use
that extra bit for a larger positive range, you'd have to go to a
separate integer type (actually probably a modular type, but let's not
get into that here). In that case you will have to perform the explicit
conversions to get the assignment to work. And of course the conversion
will raise an exception if the value won't fit in an integer.

--
T.E.D.


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