y signed
      floating-point number in decimal notation, in the style <code class="code">dddd.ddd<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e/<span class="constructor">E</span>+-dd</code>.</li>
<li><code class="code">h</code>, <code class="code"><span class="constructor">H</span></code>: reads an optionally signed floating-point number
      in hexadecimal notation.</li>
<li><code class="code"><span class="constructor">F</span></code>: reads a floating point number according to the lexical
      conventions 