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Date: Mon, 29 Jun 2009 16:13:54 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: unsigned type
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Date: 2009-06-29T16:13:55+02:00
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Rob Solomon schrieb:
> I was able to use the Natural and Positive.  
> 
> 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 := Long_Integer(c32);

(this type conversion might not be what you want...)

> How to I output c31 and c32?  Modula-2 uses WriteCard or CardToString
> and WriteString

For the modular types you have defined, you instantiate I/O packages
with the types. For example,

with Ada.Text_IO;  use Ada;  -- make Text_IO directly visible

procedure P is

        type card31 is mod 2_147_483_648;
        type card32 is mod 4_294_967_296;
        c31 : Card31;
        c32: Card32;
        LI : Long_Integer;

	-- I/O of modular numbers defined above
        package Card_IO_31 is new Text_IO.Modular_IO(card31);
        package Card_IO_32 is new Text_IO.Modular_IO(card32);
begin
        Text_IO.put("c31 (not initialized) is ");
        Card_IO_31.Put(c31);
        Text_IO.new_line;

        Text_IO.put("c32 (not initialized) is ");
        Card_IO_32.Put(c32);
        Text_IO.new_line;
end P;

It's usually a good idea to have a tutorial or reference
near you too look up such things.