From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.5-pre1 (2020-06-20) on
	ip-172-31-74-118.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.5-pre1
Path: eternal-september.org!reader02.eternal-september.org!news.gegeweb.eu!gegeweb.org!usenet-fr.net!feeder1-2.proxad.net!proxad.net!feeder1-1.proxad.net!cleanfeed3-a.proxad.net!nnrp1-1.free.fr!not-for-mail
Newsgroups: comp.lang.ada
References: <c4cce4e8-8b69-4a0a-b628-921c1b845dcfn@googlegroups.com>
 <fc7db0da-59f3-4b50-be41-98b8f3eb8ca5n@googlegroups.com>
 <5126648c-215e-4d9e-bdd9-82fa5b510896n@googlegroups.com>
From: DrPi <314@drpi.fr>
Subject: Re: From_string(Arg : String) return Big_Integer
Date: Sat, 9 Jan 2021 23:13:15 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.6.0
MIME-Version: 1.0
In-Reply-To: <5126648c-215e-4d9e-bdd9-82fa5b510896n@googlegroups.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: fr
Content-Transfer-Encoding: 8bit
Message-ID: <5ffa2a7b$0$19459$426a74cc@news.free.fr>
Organization: Guest of ProXad - France
NNTP-Posting-Date: 09 Jan 2021 23:13:15 CET
NNTP-Posting-Host: 82.65.30.55
X-Trace: 1610230395 news-2.free.fr 19459 82.65.30.55:64550
X-Complaints-To: abuse@proxad.net
Xref: reader02.eternal-september.org comp.lang.ada:61085
List-Id: <comp.lang.ada>

Le 09/01/2021 à 21:11, soren rundgren a écrit :
> lördag 9 januari 2021 kl. 18:00:36 UTC+1 skrev AdaMagica:
>> Since Ada 202X is not yet released, this package is not yet fully implemented. (I had a conversation with AdaCore about a similar case a year ago.)
> 
> I managed to make a very basic solution by creating my own:
> 
>     function My_From_String(S : String) return Big_Integer is
>        sum : Big_Integer := 0;
>        Len : constant Integer := S'Length;
>        i : Integer := 1;
>     begin
>        -- Ada.Text_IO.Put_Line("My_From_String.S = " & S);
>        while i <= Len loop
>           case S(i) is -- i = Len : Len - Len = 0,
>                        -- i = 1 : Len - 1
>              when '1' => sum := sum + 1*10**(Len - i);
>              when '2' => sum := sum + 2*10**(Len - i);
>              when '3' => sum := sum + 3*10**(Len - i);
>              when '4' => sum := sum + 4*10**(Len - i);
>              when '5' => sum := sum + 5*10**(Len - i);
>              when '6' => sum := sum + 6*10**(Len - i);
>              when '7' => sum := sum + 7*10**(Len - i);
>              when '8' => sum := sum + 8*10**(Len - i);
>              when '9' => sum := sum + 9*10**(Len - i);
>              when others => null;
>           end case;
>           i := i + 1;
>        end loop;
>        return sum;
>     end My_From_String;
> 
A much simpler function for Integer :

    function Int_From_String (Str : String) return Integer is
       Num : Integer := 0;
    begin
       for C of Str loop
          Num := (Num * 10) + Integer'Value((1 => C));
       end loop;

       return Num;
    end Int_From_String;

Notes :
- I don't have a 202x compiler, so I can't check if it works with big ints.
- It does not manage the sign (like the function you designed).