public static AddClass_Unary operator -(AddClass_Unary op1)
        {
            AddClass_Unary returnVal = new AddClass_Unary();

            returnVal.val = -op1.val;

            return(returnVal);
        }
        public static AddClass_Unary operator +(AddClass_Unary op1, AddClass_Unary op2)
        {
            AddClass_Unary returnVal = new AddClass_Unary();

            returnVal.val = op1.val + op2.val;

            return(returnVal);
        }