Returns a new token representing the additive identity. It should be overridden in subclasses.
@return A new Token containing the additive identity.If this token is a nil token, then {@link #NIL} is returned.
@exception IllegalActionException If this method is notsupported by the derived class.
Return the type of the additive identity for elements of this type.
@return A new type, or BaseType.GENERAL, if the operation doesnot make sense for the given types.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.