<html>
<style>
body {
font-family: courier, fixed, sans-serif;
}
h1 {
font-size: 1.25em;
}
table, td {
border: 1px #cccccc solid;
}
table {
border-collapse: collapse;
}
td, th {
padding: 0.3em 1em;
font-size: 0.85em;
}
tbody tr:nth-child(odd) {
background-color: #f3f3f3; /* zebra stripes */
}
</style>
<body>
<h1>Bits Cheat Sheet</h1>
<table>
<thead>
<tr>
<th> </th>
<th>2<sup>n</sup></th>
<th>Bits</th>
<th>Max unsigned int</th>
<th>Min signed int</th>
<th>Max signed int</th>
</tr>
</thead>
<tbody>
<? foreach(range(1, 32) as $b): ?>
<tr>
<td>2<sup><?=$b ?></sup></td>
<td><?=number_format(pow(2, $b)) ?></td>
<td><?=$b ?></td>
<td><?=number_format(pow(2, $b) - 1) ?></td>
<td><? $num = pow(2, $b) / 2 * -1 ?><?=number_format($num) ?></td>
<td><? $num = pow(2, $b) / 2 - 1 ?><?=number_format($num) ?></td>
</tr>
<? endforeach; ?>
</tbody>
</table>
</body>
</html>