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Re: Best way to round a number.

by CountZero (Bishop)
on Oct 25, 2012 at 07:58 UTC ( #1000775=note: print w/replies, xml ) Need Help??

in reply to Best way to round a number.

Maybe not the "best" way, but very flexible: adjust the %rule hash to change the way the rounding will work based upon the last digit and the regex will do all the work (assuming you feed it a positive integer):
use Modern::Perl; my %rule = ( 0 => 0, 1 => -1, 2 => -2, 3 => 2, 4 => 1, 5 => 0, 6 => -1, 7 => -2, 8 => 2, 9 => 1, ); my @nums = 0..30; foreach (@nums) { print "in=$_"; s/(\d*(\d))/$1+$rule{$2}/e; say "\t rounded=$_"; }


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