Use the abs function to find the absolute value .
The absolute value is a size that does not consider the sign, and is always a positive value. It is a number that represents how far away from 0. If it is "3", it will be "3", and if it is "-3", it will be "3".
This is an example to find the absolute value.
use strict; use warnings; my $num = -4; my $num2 = abs $num; print "(1) Find the absolute value.\n"; print "$num2\n";