s: indexing pointers, arrays or
<tt>struct</tt>/<tt>union</tt> types; initializing cdata objects;
casts to C&nbsp;types; writing to external variables; passing
arguments to C&nbsp;calls:
</p>
<table class="convtable">
<tr class="convhead">
<td class="convin">Input</td>
<td class="convop">Conversion</td>
<td class="convout">Output</td>
</tr>
<tr class="odd separate">
<td class="convin">number</td><td class="convop">&rarr;</td><td class="convout"><tt>double</tt></td></tr>
<tr class="even">
<td class="convin">