<?php
function compare($f, $g) {
echo '<table border="1" style="border-collapse:collapse" cellpadding="4">';
echo '<tr><th>A</th><th>B</th><th>C</th><th>Y1</th><th>Y2</th></tr>';
for ($i = 0; $i < 8; $i++) {
$a = (($i & 0x01) != 0);
$b = (($i & 0x02) != 0);
$c = (($i & 0x04) != 0);
$y1 = $f($a, $b, $c);
$y2 = $g($a, $b, $c);
printf('<tr><td>%d</td><td>%d</td><td>%d</td><td>%d</td><td>%d</td></tr>', $a, $b, $c, $y1, $y2);
}
echo '</table>';
}
function y12_1($a, $b, $c) {
return !(($a && $b && !$c) || ($a && !$b && $c) || (!$a && $b && $c));
}
function y12_2($a, $b, $c) {
return !(!(!$a && !$b) && !(!$a && !$c) && !(!$b && !$c) && !(!$b && !$c) && !($a && $b && $c));
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Week 2</title>
</head>
<body>
<?php
compare('y12_1', 'y12_2');
?>
</body>
</html>
