#!/usr/bin/perl

$x = 3;
$y = 5;

$z = $x + $y;
print "$x + $y = $z\n";
# 3 + 5 = 8

$z = ++$x + $y;
print "$x + $y = $z\n";
# 4 + 5 = 9

$x = 3;

# watch out for this one
$z = $x++ + $y;
print "$x + $y = $z\n";
# 4 + 5 = 8