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From: Preben Randhol <randhol+news@pvv.org>
Newsgroups: comp.lang.ada
Subject: Re: Concatenation and Characters
Date: Fri, 18 Oct 2002 18:13:06 +0000 (UTC)
Organization: Norwegian university of science and technology
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Date: 2002-10-18T18:13:06+00:00
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Programmer Dude wrote:
> Mark Biggar wrote:
> 
>> Becasue evaluating an uninitialized variable is only a bounded error,
>> which is handled at run-time.
> 
> I'm new to, and just beginning to explore, Ada.  It surprised me that
> Ada allows evalutation of an uninitialized variable without saying
> *something* about it during compile.
> 
> Surely I'm missing something?

Here is an example:

with Ada.Text_IO; use Ada.Text_IO;

procedure uninit is
   A  : Integer;
   B  : Integer := 2;
begin

   if A > B then
      Put_Line ("A is greater than B");
   else
      Put_Line ("B is greater than A");
   end if;
end uninit;


Compiling it with GNAT:

gnatmake uninit.adb 

gnatgcc -c uninit.adb
uninit.adb:4:04: warning: "A" is never assigned a value
gnatbind -x uninit.ali
gnatlink uninit.ali

You can also compile with the -gnatwe flag which treats all warnings as
errors.

Regards,
Preben
-- 
This is Ada land. On quiet nights you can hear C programmers debug.