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Extend the handling of field names in Fig. $6.18$ to classes and single-inheritance class hierarchies.

  1.  Give an implementation of class $Enu$ that allows linked symbol tables, so that a subclass can either redefine a field name or refer directly to a field name in a superclass.
  2. Give a translation scheme that allocates a contiguous data area for the fields in a class, including inherited fields. Inherited fields must maintain the relative addresses they were assigned in the layout for the superclass. 


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