scanf_format&nbsp;ic&nbsp;fmt&nbsp;f</code> reads a format string token from the formatted
    input channel <code class="code">ic</code>, according to the given format string <code class="code">fmt</code>, and
    applies <code class="code">f</code> to the resulting format string value.
    Raise <a href="Scanf.html#EXCEPTIONScan_failure"><code class="code"><span class="constructor">Scanf</span>.<span class="constructor">Scan_failure</span></code></a> if the format string value read does not have the
    s