If you're dealing with integers,

$array[$i] = abs($n);
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If you're dealing with floats,

use POSIX qw( ceil floor );

$array[$i] = int(abs($n));            # Truncates
$array[$i] = sprintf('%d', abs($n));  # Rounds
$array[$i] = ceil(abs($n));           # Finds ceiling
$array[$i] = floor(abs($n));          # Finds floor
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Add the "\n" when you print. There's no reason to store it in the array.