float</span></code>,
        <code class="computeroutput"><span class="keyword">double</span></code> and <code class="computeroutput"><span class="keyword">long</span>
        <span class="keyword">double</span></code>. The strings can be in all
        lower case or all upper case. An optional + sign can be used with positive
        numbers. This can be controlled with the <code class="computeroutput"><span class="identifier">uppercase</span></code>,
        <code class="computeroutput"><span class="ident