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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: unsigned type
Date: Mon, 29 Jun 2009 07:18:09 -0700 (PDT)
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Date: 2009-06-29T07:18:09-07:00
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Rob Solomon wrote on comp.lang.ada:
> I was able to use the Natural and Positive. =A0
>
> Now I'm trying to understand Mod types.
>
> I tried this:
> type card31 is mod 2_147_483_648;
> type card32 is mod 4_294_967_296;
> c31 : Card31;
> c32: Card32;
> LI : Long_Integer;
> and
>
> LI :=3D Long_Integer(c32);
>
> How to I output c31 and c32? =A0Modula-2 uses WriteCard or CardToString
> and WriteString
>
> I tried using Put, but I got an error saying that correct procedure
> could not be found, or something like that.
>
> Put(LI) works until the value of LI > 2**31, even for c32.

Ada.Text_IO.Put_Line (Card31'Image (c31));

or

   package C31_IO is new Ada.Text_IO.Modular_Text_IO (Num =3D> Card31);
begin
   C31_IO.Put (c31);

But I have three suggestions:

- rather than "type card31 is mod 2_147_483_648", write "type card31
is mod 2**31;"

- do not declare machine-oriented types like card31 or card32 in the
first place; instead, define application-oriented types like
"Temperature" or whatever

- before you define modular types, explain to yourself why you need
the wrap-around semantics or the bitwise operators (modular types have
them, signed integer types don't).

--
Ludovic Brenta.