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From: rav@goanna.cs.rmit.edu.au (robin)
Subject: Re: Leading zeros with Int_IO.Put()? Or another package?
Date: 1996/11/08
Message-ID: <55ubsh$lh0$1@goanna.cs.rmit.edu.au>#1/1
X-Deja-AN: 195208643
references: <baldwinE0Eq2n.KLB@netcom.com>
 <327FB8A3.745B@itg-sepg.logicon.com>
organization: Comp Sci, RMIT, Melbourne, Australia
newsgroups: comp.lang.ada,comp.lang.pl1
nntp-posting-user: rav
Date: 1996-11-08T00:00:00+00:00
List-Id: <comp.lang.ada>


	David Shochat <shochat@itg-sepg.logicon.com> writes:

	>J.D. Baldwin wrote:

	>> My question:  is there a better way to pad out integers with leading
	>> zeros?  

	>Whenever I need leading zeros (in any radix), I use what we call here
	>the "Everage Maneuver" (named after fellow Logiconer Amy Everage, who
	>came up with this years ago). Lets say we want to put the nonnegative
	>integer n to a field of k characters with radix r using leading zeros if
	>necessary. So we assert n < r**k.
	>1. Convert n + r**k to a string. This uses k+1 characters, the 1st of
	>which is '1', representing r**k.
	>2. Use all but the 1st character from the result of (1).

Interface to PL/I and you can use standard I/O:

put edit (n) (P'-99999999');

and you don't have to worry about whether the number is
negative either.  The nines in the picture format
force leading zeros to print.

And if you want, you can insert commas in the output
to make it more readable.  The picture specification becomes:

P'-999,999,999'