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From: "Steve" <nospam_steved94@attbi.com>
Newsgroups: comp.lang.ada
References: <b6eog4$8jl$1@news.uni-stuttgart.de>
Subject: Re: Ada2005 random
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The following code almost does what you asked for.  The problem is that
without the delays the selected random number is always the same.  I think
this is because a new generator is created for each call, and the "seed"
value (based on time) is the same unless I include delays.

with Ada.Integer_text_Io;
with Ada.Text_Io;

procedure CLA_Test2 is

  function Check( low, high : Integer ) return Integer is
    subtype check_range is integer range low .. high;
    package ranged_random is
      new Ada.Numerics.Discrete_Random( check_range );
    gen : ranged_random.Generator;
  begin
    ranged_random.reset( gen );
    return ranged_random.Random( gen );
  end Check;

begin
  Ada.Integer_Text_Io.Put( Check( 1, 10 ) );
  Ada.Text_Io.New_Line;
  Delay 1.0;
  Ada.Integer_Text_Io.Put( Check( 1, 10 ) );
  Ada.Text_Io.New_Line;
  Delay 1.0;
  Ada.Integer_Text_Io.Put( Check( 1, 10 ) );
  Ada.Text_Io.New_Line;
  Delay 1.0;
  Ada.Integer_Text_Io.Put( Check( 1, 10 ) );
  Ada.Text_Io.New_Line;
  Delay 1.0;
end CLA_Test2;

I would probably go with creating my own routine using the float package.
Steve
(The Duck)


"Peter Hermann" <ica2ph@sinus.csv.ica.uni-stuttgart.de> wrote in message
news:b6eog4$8jl$1@news.uni-stuttgart.de...
> In an application I need a variable discrete random function.
>
> Due to good reason I am reluctant to use my own very old
> http://www.csv.ica.uni-stuttgart.de/ftp/pub/ada/ica/misc/randomph.txt
>
> Instead, I would prefer to use
> generic
>    type Result_Subtype is (<>);
> package Ada.Numerics.Discrete_Random is
>
> which offers a
>    function Random (Gen : Generator) return Result_Subtype;
>
> but does not offer something like
>    function Random (Gen : Generator;
>                     from : Result_Subtype := Result_Subtype'first;
>                      to  : Result_Subtype := Result_Subtype'last)
>                                       return Result_Subtype;
> which may or may not make sense in that raw disguise.
>
> Anyway in Ada95, I have to roll my own code or let me send one ;-)
>
> Does an AI exist for Ada95 or Ada2005?
> Did I miss something?
>
> --
> --Peter Hermann(49)0711-685-3611 fax3758 ica2ph@csv.ica.uni-stuttgart.de
> --Pfaffenwaldring 27 Raum 114, D-70569 Stuttgart Uni Computeranwendungen
> --http://www.csv.ica.uni-stuttgart.de/homes/ph/
> --Team Ada: "C'mon people let the world begin" (Paul McCartney)