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Re: Best way to round a number.

by ajam (Acolyte)
on Oct 25, 2012 at 00:32 UTC ( #1000739=note: print w/replies, xml ) Need Help??

in reply to Best way to round a number.

It can be done with less division.

Notice 0, 1 and 2 round to 0. While 3 and 4 round up to 5. Using this knowledge, examine the number modulus 5. If its below 3 round down, otherwise round up.

Also I agree with the other comment, your examples are a bit off. For example both 33 and 36 round to 35.

use warnings; use strict; sub round5 { my ($number) = @_; my $remainder = $number % 5; if ($remainder < 3) { return $number - $remainder; } else { return $number - $remainder + 5; } } for (0..10) { print "$_ rounded is " . round5($_) . "\n"; }

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