pan class="keywordsign">'</span>c,&nbsp;<span class="keywordsign">'</span>d)&nbsp;scanner</code>, since it is a formatted input function that
    reads from <a href="Scanf.Scanning.html#VALstdin"><code class="code"><span class="constructor">Scanf</span>.<span class="constructor">Scanning</span>.stdin</code></a>: <code class="code">scanf&nbsp;fmt&nbsp;f</code> applies <code class="code">f</code> to the arguments
    specified by <code class="code">fmt</code>, reading those arguments from <a href="Pervasives.