From: Stephen Satchell <list@fluent2.pyramid.net>
To: Glynn Clements <glynn.clements@virgin.net>,
"J." <mailing-lists@xs4all.nl>
Cc: linux-c-programming@vger.kernel.org
Subject: Re: printf(), aligning fields
Date: Sat, 23 Aug 2003 18:05:56 -0700 [thread overview]
Message-ID: <5.2.1.1.0.20030823180113.011bceb8@fluent2.pyramid.net> (raw)
In-Reply-To: <16200.462.367759.211524@cerise.nosuchdomain.co.uk>
At 01:07 AM 8/24/2003 +0100, Glynn Clements wrote:
> > I am trying to print collums from a c program, as the
> > following example illustrates:
> >
> > Total Number Folder
> > ----- ------ ------
> > 15502 17 cronlog
> > 189897 42 linux/debian-curiosa
> > 161751 32 linux/debian-firewall
> > 4305 1 linux/debian-general
> > 17431 1 linux/debian-news
> > 107517 1 linux/vger-kernel-announce
> > 61136 16 linux/vger-kernel-c-programming
> > 8580 2 linux/vger-kernel-gcc
> >
> > How can I can align the output to the max right field boundry without
> > overcrossing that field boundry if the field value gets longer?
> >
> > Do I really have to check the length of the value before printing it with,
> > %*s, and then determine how many spaces I need?
>
>You have to make the field large enough to hold all of the values. The
>*printf() family of functions don't provide any way to truncate a
>field to a maximum width.
No, but a program can truncate numbers to the left.
printf ("%7d%3d %1.64s\n", (total % 10000000), (number % 1000), folder);
Your other option is to do a conversion to string, and fill the string with
an "overflow indicator" when the number to be displayed is too large. The
advantage of the second method is you can insert comma (or dot, for Europe)
delimiters to make the numbers easier for humans to read.
--
X -> unknown; Spurt -> drip of water under pressure
Expert -> X-Spurt -> Unknown drip under pressure.
next prev parent reply other threads:[~2003-08-24 1:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-21 12:48 Question about checksums Holger Kiehl
2003-08-21 13:20 ` Luciano Miguel Ferreira Rocha
2003-08-21 16:36 ` Holger Kiehl
2003-08-21 17:28 ` Jeff Woods
2003-08-22 20:18 ` Holger Kiehl
2003-08-23 20:31 ` printf(), aligning fields J.
2003-08-24 0:07 ` Glynn Clements
2003-08-24 1:05 ` Stephen Satchell [this message]
2003-08-21 18:19 ` Question about checksums Luciano Miguel Ferreira Rocha
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