#!/usr/bin/env perl

# [[[ PREPROCESSOR ]]]
# <<< PARSE_ERROR: 'ERROR ECOPARP00' >>>
# <<< PARSE_ERROR: 'Unexpected Token:  $FOO' >>>

# [[[ HEADER ]]]
use RPerl;
use strict;
use warnings;
our $VERSION = 0.001_000;

# [[[ CRITICS ]]]
## no critic qw(ProhibitUselessNoCritic ProhibitMagicNumbers RequireCheckedSyscalls)  # USER DEFAULT 1: allow numeric values & print operator
## no critic qw(RequireInterpolationOfMetachars)  # USER DEFAULT 2: allow single-quoted control characters & sigils

# [[[ OPERATIONS ]]]

my integer $FOO = 0;
my integer $bar = 1;
my integer $bat = !$FOO;
my integer $baz = !($bar);

print 'have $FOO = ', $FOO, "\n";
print 'have $bar = ', $bar, "\n";
print 'have $bat = ', $bat, "\n";
print 'have $baz = ', $baz, "\n";

$FOO = 2;
$bar = 3;
$bat = !2;                  # returns empty string ''
$baz = !( $FOO - $bar );    # returns empty string ''
my integer $bax = !!$FOO;

print 'have $FOO = ', $FOO, "\n";
print 'have $bar = ', $bar, "\n";
print 'have $bat = ', $bat, "\n";
print 'have $baz = ', $baz, "\n";
print 'have $bax = ', $bax, "\n";