code: @Override
      public void resolve(final ValueStack values) throws Exception
      {
          if (values.size() < 1)
              throw new Exception("missing operands for " + toString());
          try
          {
              final double rads = values.popDouble();
              final double degrees = rads * (180 / Math.PI);
              values.push(new Double(degrees));
          } catch (final ParseException e)
          {
              e.fillInStackTrace();
              throw new Exception(toString() + "; " + e.getMessage(), e);
          }
      }
docs: {@inheritDoc}