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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: Leading zeros with Int_IO.Put()? Or another package?
Date: 1996/11/09
Message-ID: <dewar.847550505@merv>#1/1
X-Deja-AN: 195511499
references: <baldwinE0Eq2n.KLB@netcom.com> <3281088B.24F@watson.ibm.com>
 <32834C9C.6D6A@watson.ibm.com>
organization: New York University
newsgroups: comp.lang.ada
Date: 1996-11-09T00:00:00+00:00
List-Id: <comp.lang.ada>


Norman Cohen says

"Keith Thompson informed me in private correspondence that, like the
standard 'Image attribute, the GNAT-only 'Img attribute puts in that
annoying leading space, and upon trying it I find he's right.  That's
the risk of relying on vague recollections of descriptions of 'Img by
GNAT team members rather than testing its behavior.  (The ideal
approach, of course, is to consult the documentation, but no version of
gnatinfo.txt that I have mentions 'Img.)"

Norman, you are missing a critical piece of documentation that is included
in all GNAT releases, and which has often been mentioned on CLA, namely
the features file.

This describes the language features implemented, and in particular has
full documentation on all GNAT defined attributes and pragmas (there are
quite a lot of them, you should definitely look at this file).

Here is the excerpt on 'Img

  Img 
   
    The 'Img function is defined for any prefix, P, that denotes an
    object of scalar type T. P'Img is equivalent to T'Image (P). This
    is convenient for debugging. For example:
   
       Put_Line ("X = " & X'Img);
   
    has the same meaning as the more verbose:
   
       Put_Line ("X = " & Temperature_Type'Image (X));
   
    where Temperature_Type is the subtype of the object X.

I think you will find reading this file better than relying on vague
recollections :-)