From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <yallop@gmail.com>
X-Original-To: caml-list@sympa.inria.fr
Delivered-To: caml-list@sympa.inria.fr
Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104])
	by sympa.inria.fr (Postfix) with ESMTPS id B7D0E7EE25
	for <caml-list@sympa.inria.fr>; Wed,  6 Nov 2013 13:57:14 +0100 (CET)
Received-SPF: None (mail3-smtp-sop.national.inria.fr: no sender
  authenticity information available from domain of
  yallop@gmail.com) identity=pra; client-ip=74.125.82.44;
  receiver=mail3-smtp-sop.national.inria.fr;
  envelope-from="yallop@gmail.com";
  x-sender="yallop@gmail.com"; x-conformance=sidf_compatible
Received-SPF: Pass (mail3-smtp-sop.national.inria.fr: domain of
  yallop@gmail.com designates 74.125.82.44 as permitted sender)
  identity=mailfrom; client-ip=74.125.82.44;
  receiver=mail3-smtp-sop.national.inria.fr;
  envelope-from="yallop@gmail.com";
  x-sender="yallop@gmail.com"; x-conformance=sidf_compatible;
  x-record-type="v=spf1"
Received-SPF: None (mail3-smtp-sop.national.inria.fr: no sender
  authenticity information available from domain of
  postmaster@mail-wg0-f44.google.com) identity=helo;
  client-ip=74.125.82.44;
  receiver=mail3-smtp-sop.national.inria.fr;
  envelope-from="yallop@gmail.com";
  x-sender="postmaster@mail-wg0-f44.google.com";
  x-conformance=sidf_compatible
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: AksEAHk7elJKfVIslGdsb2JhbABahAYMgkREvCsBCYEeCBYOAQEBAQcLCwkSKoIlAQEFIx0BGx0BAwwGBQsNAgImAgIhAQERAQUBHAYTh24BAw+gHowEU4MJhCYKGScNZIkBAQUMgR2LPoJyB4JrgUUDliGBa4xSg0wYKYRRPA
X-IPAS-Result: AksEAHk7elJKfVIslGdsb2JhbABahAYMgkREvCsBCYEeCBYOAQEBAQcLCwkSKoIlAQEFIx0BGx0BAwwGBQsNAgImAgIhAQERAQUBHAYTh24BAw+gHowEU4MJhCYKGScNZIkBAQUMgR2LPoJyB4JrgUUDliGBa4xSg0wYKYRRPA
X-IronPort-AV: E=Sophos;i="4.93,647,1378850400"; 
   d="scan'208";a="34015506"
Received: from mail-wg0-f44.google.com ([74.125.82.44])
  by mail3-smtp-sop.national.inria.fr with ESMTP/TLS/RC4-SHA; 06 Nov 2013 13:57:14 +0100
Received: by mail-wg0-f44.google.com with SMTP id n12so4765867wgh.11
        for <caml-list@inria.fr>; Wed, 06 Nov 2013 04:57:13 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :cc:content-type;
        bh=dFGh7hy+knJCQjQhVjm7Kr/wt5Ec1NNZ0DYrVTlO6wI=;
        b=QLV4SUDOFhNh1fyWkSHov4u/X+SCi8u1lTXyFAXprWMkUtw2dPlE/ZKeEXDRS2VTI7
         oubf4MotLNY1H/DcG0Nx86H6YVXNlvlm+LN8txZg4StVi8yR0tSglrD2v0Yh+0C5xHDv
         UcjgPETcAZMiePTfIZqbnnSytfOYBy3OmcoHPgq199c/hvwglumUGqh2IpdhxWEKPc/v
         +6OqbnQeFhxV/RSyuxpgLKsKrRRhYyTJTqbzzth69Eog/7w4fyIhViUIVjbSgm9HmAqo
         iPYVBwSpxTkZeEDKF+QRov1BH+jWFZA8Uawc5H0RJ0evHOkn7cH66GKLCepX6Xpa6nji
         lJXA==
MIME-Version: 1.0
X-Received: by 10.180.94.100 with SMTP id db4mr21286013wib.14.1383742633847;
 Wed, 06 Nov 2013 04:57:13 -0800 (PST)
Received: by 10.216.185.65 with HTTP; Wed, 6 Nov 2013 04:57:13 -0800 (PST)
In-Reply-To: <527A389B.9070408@gmail.com>
References: <527A389B.9070408@gmail.com>
Date: Wed, 6 Nov 2013 12:57:13 +0000
Message-ID: <CAAxsn=E6GkTO_daN4dhxxvw-2_3zvY7w1PJiRYELLAH2qcGrJQ@mail.gmail.com>
From: Jeremy Yallop <yallop@gmail.com>
To: Matej Kosik <5764c029b688c1c0d24a2e97cd764f@gmail.com>
Cc: OCaml <caml-list@inria.fr>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [Caml-list] is there a way for turning strings to "format"s?

On 6 November 2013 12:39, Matej Kosik
<5764c029b688c1c0d24a2e97cd764f@gmail.com> wrote:
> I would like to ask, how to do something like:
>
>         let computed_format = Printf.sprintf "%%0%dd" 5 in
>         Printf.printf computed_format 42

For this example, you can use '*' in the format string to pass the
width as an argument

         let computed_format = Printf.sprintf "%0*d" 5 in
         computed_format 42

or even just

         Printf.sprintf "%0*d" 5 42