#!/usr/bin/env perl
use strict;
use warnings;


sub println {
    local $, = "";
    print +(@_ ? @_ : $_), $/;
}


println(4 % 3);

println(4 % 2);

println(-4 % 3);

println(4 ** 2);

println(2 ** (1/2));

my $foo = 1;

println($foo--);

println($foo);

println("dog");

$foo = 1;

println(--$foo);

println($foo);

$foo = 'd';

println(--$foo);

println($foo);

$foo = 'Z';

println($foo++);

println($foo);

$foo = 'Hello';
$foo .= ', world';
println($foo);

my $bar = '+';
$bar x= 6;
println($bar);

print '$a = ';
my $a = <STDIN>;
print '$b = ';
my $b = <STDIN>;
print '$c = ';
my $c = <STDIN>;


my $ncookies = 0;

sub printcookies {
    println("I like cookies " . $ncookies++);
}


if ($a == 5 && $b == 2) {
    printcookies();
}


if ($a == 5 && $b == 2 || $c == 2) {
    printcookies();
}


if ($a == 5 and ($b == 2 || $c == 3)) {
    printcookies();
}


if ($a == 5 && $b == 2 or $c == 3) {
    printcookies();
}


if ($a == 5 && $b == 2 or $c == 3) {
    printcookies();
}


if (($a == 5 && $b == 2) or $c == 3) {
    printcookies();
}


($a, $b) = (5, 2);
if ($a == 4 && $b < 3) {
    printcookies();
}