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$a = 0;
$b = 0;
$c = $a++ && $b++;  # only $a++ is evaluated
print "a = $a, b = $b\n";  # prints "a = 1, b = 0"

$a = 0;
$b = 0;
$c = ++$a || ++$b;  # only ++$a is evaluated
print "a = $a, b = $b\n";  # prints "a = 1, b = 0"