What string should I pass to Java lang.Long. Parselong() to return Nan?

Unfortunately, I can't use anything like long Nan, because the string is actually the return value from different C modules Is there a string I can pass to parselong() to return a Nan?

Solution

No long Nan – you're confused

For double Nan, how about this:

public double myParseDouble(String s)
{
   double result;
   try
   {
      result = Double.parseDouble(s);
   }
   catch (NumberFormatException nfe)
   {
      result = Double.NaN;
   }
   return result;
}

(edit: the obvious way is to pass in any invalid double string, such as an empty string or Nan)