#!/usr/bin/perl

$x = 1; $y = 0;

# example of AND
$z = $x && $y;
print "$x && $y = $z\n";
# prints 1 && 0 = 0

# example of OR
$z = $x || $y;
print "$x || $y = $z\n";
# prints 1 || 0 = 1

# example of NOT
$z = !$y;
print "!$y = $z\n";
# prints !0 = 1

# example of NOT
$z = !$x;
print "!$x = $z\n";
# prints !1 = 0 ? No, actually it leaves $z as a blank!