Zero padding numbers (was: Ok, here's an easy one)

glickjd has asked for the wisdom of the Perl Monks concerning the following question:

I want to make sure my number is always two digits.

my $num = 5;

What's the easiest way to make $num = 05 instead of 5? Can I do this with sprintf?

Thanks

Jeremy

edited: Mon Sep 9 00:22:18 2002 by jeffa - title change

Comment on Zero padding numbers (was: Ok, here's an easy one)

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Re: Ok, here's an easy one by Aristotle (Chancellor) on Sep 08, 2002 at 17:44 UTC
See `perldoc -f sprintf and man 3 printf my $num = sprintf "%02d", $some_number; Makeshifts last the longest.`	[reply] [d/l]
Re: Ok, here's an easy one by blakem (Monsignor) on Sep 08, 2002 at 17:44 UTC
see sprintf `$num = 5; $zero_padded = sprintf "%02d", $num; print "$zero_padded\n";` [download] -Blake	[reply] [d/l]
Re: Ok, here's an easy one by abitkin (Monk) on Sep 08, 2002 at 19:53 UTC
sprintf is too easy, here's a fun way. `#!/usr/bin/perl my $num = 5; $num = substr("00",2-length($num)) . $num if length($num)<2; print $num;` [download] I only mention it, becuase sometimes you want to pad with something other than 0's (for example "." when doing a TOC listing.)	[reply] [d/l]
Re: Re: Ok, here's an easy one by I0 (Priest) on Sep 09, 2002 at 03:13 UTC
`$num = substr("00".$num,-2);`	[reply] [d/l]
Re: Ok, here's an easy one by Zaxo (Archbishop) on Sep 08, 2002 at 17:45 UTC
Yes, format string "%02d". After Compline, Zaxo	[reply]
Re: Ok, here's an easy one by glickjd (Novice) on Sep 08, 2002 at 17:46 UTC
I think I found it... $num = sprintf("%.2u", $num); guess I should have gave myself more time. Sorry to be wasting space for a stupid question.	[reply]
Re: Zero padding numbers (was: Ok, here's an easy one) by The_Rev (Acolyte) on Sep 09, 2002 at 13:07 UTC
Just to say it one more time! `$num = sprintf("%02d", $num);` [download]	[reply] [d/l]


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