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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Learning Ada (Was: unsigned type)
Date: Mon, 6 Jul 2009 18:15:16 -0500
Organization: Jacob Sparre Andersen
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Date: 2009-07-06T18:15:16-05:00
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"anon" <anon@anon.org> wrote in message 
news:4Aa4m.421894$4m1.207252@bgtnsc05-news.ops.worldnet.att.net...
...
>        But Ada also, use standards for it types, "Integer", and "Float', 
> with
> their associate subtypes.  One reason but not the only reason for the 
> range of
> these built-in types are the hardware.  If the hardware uses 32-bits 
> integers
> then the Ada "Integer" is based on 32-bit.

This statement is not true. For instance, for Janus/Ada 95 on Windows, type 
Integer is 16-bits. (We chose that to remain compatible with our earlier 
compilers.)

All the standard requires is that Integer is 16-bits, and that Long_Integer 
(if it exists) is longer than Integer.

Thus, type Integer means vastly different things when compiled with 
Janus/Ada on Windows as compared to when compiled with Gnat on Windows. If 
you need values up to 1 million, you will have no portability at all if you 
use type Integer.

OTOH,
                       type My_Int is range 0 .. 1_000_000;

will work properly on both compilers (and most likely, on any other Ada 
compiler for Windows).

So which is more portable??

                                 Randy.