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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Integer to String
Date: Thu, 29 Jan 2015 17:51:03 +0000
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Date: 2015-01-29T17:51:03+00:00
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montgrimpulo <aghte@hotlinemail.com> writes:

>    num : integer ; char : character ; str : String(1..6);
> begin

>    str:="123456";
>    num:=Integer'Value(str);
>    New_Line(2);Put("num= ");Put(num);
> (20)   str:=Integer'Image(num);

> raised CONSTRAINT_ERROR : itos.adb:20 length check failed.

Integer'Image prefixes the digits of the result with a '-' if the number
is negative and a space if it's positive.

You could just write

   Put (Integer'Image (num));

or

   num := Integer'Value ("123456");
   Put_Line ("str=" & Integer'Image (num));