more general
    source of characters is named a <em>formatted input channel</em> (or <em>    scanning buffer</em>) and has type <a href="Scanf.Scanning.html#TYPEin_channel"><code class="code"><span class="constructor">Scanf</span>.<span class="constructor">Scanning</span>.in_channel</code></a>. The more general
    formatted input function reads from any scanning buffer and is named
    <code class="code">bscanf</code>.</p>

<p>Generally speaking, the formatted input functions have 3 arguments:</p>
<ul>
<l