pan class="string">""</span></code>.</li>
</ul>
<ul>
<li>in addition to the relevant digits, <code class="code"><span class="string">'_'</span></code> characters may appear
    inside numbers (this is reminiscent to the usual OCaml lexical
    conventions). If stricter scanning is desired, use the range
    conversion facility instead of the number conversions.</li>
</ul>
<ul>
<li>the <code class="code">scanf</code> facility is not intended for heavy duty lexical
    analysis and parsing. If it appears not 