## CatchDivByZero.pl
use strict;
use warnings;

use Error qw(:try);
use Arithmetic;
use DivByZero;

my $a = 10;
my $b = 0;
my $result;

try {
  $result = Arithmetic::divide($a,$b);
} catch DivByZero with {   ## catch it here and not in the Class Arithmetic.pm 
  $b = 1;                  ## so we can still do something else and not just die there
  $result = Arithmetic::divide($a,$b);
} catch Error with {
  my $e = shift;
  print "Unhandled Exception $e\n";
};

printf "The result is %d\n", $result;

## Arithmetic.pm
package Arithmetic;

use strict;
use warnings;
use Error qw(:try);
use DivByZero;

sub divide {
  my ($a, $b)  = @_;
  my $r;
  throw DivByZero if $b == 0;
  $r = $a/$b;
  return $r;
}

1;

## DivByZero.pm
package DivByZero;

use Moose;
extends 'Error';

1;