TIMTOWTDI.

use strict;
use warnings;

use constant LEN => 5;

my $n = 12;
my $str = '0' x (LEN-length($n)) . $n;

print "$str";

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Output is as expected -
00012

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In reply to Re: printf & sprintf: variable number formats by Roger
in thread printf & sprintf: variable number formats by Anonymous Monk

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