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From: Michal Nowak <vinnie@inetia.pl>
Newsgroups: comp.lang.ada
Subject: Re: How to convert characters in a string into integers ?
Date: Sun, 03 Feb 2002 00:27:56 +0100
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Date: 2002-02-03T00:27:56+01:00

On 02-02-02 at 21:59 Jim wrote:

>is this possible, if so how ?
>
>say im reading a string (1 + 2 + 3)    (yep carrying on with my calculator
>program :-))
>
>how to get 1 and the convert to integer, then get + and store as
character,
>get 2 and convert to integer etc ?

Have a look a Find_Token procedure (LRM A.4.3 - A.4.5). 

Little example:

Find_Token (Source => "(102 + 200 + 32)",
            Set=>To_Set("0123456789"),
            Test=>Inside,
            First,
            Last,);

This will give you the beginning and ending of first integer
in source string. You may than slice it and convert this slice
to integer:
Operand := Integer'Value (Input_String (First .. Last) );
For this case you will have 102 in Operand.

Hope this was a bit helpful,
Mike

PS. To make this code compile you will have to "with" some
packeges - look at mentioned LRM sections to which ones.
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