 Convert a base 16 ``scientific notation''
                   character string into a double precision number.
</PRE>
<h4><a name="Examples">Examples</a></h4>
<PRE>
   The following input and output argument values illustrate the
   action of <b>dp2hx_c</b> for various input values of 'number'.

   Note: The hat or caret, '^', signals an exponent.

      number             string                         length
      -----------------  -----------------------------  ------
           2.0D-9         89705F413