TCPL/A.02.4_Keywords

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A.2.4 Keywords

The following identifiers are reserved for the use as keywords, and may not be used otherwise:

     auto          double      int          struct
     break         else        long         switch
     case          enum        register     typedef
     char          extern      return       union
     const         float       short        unsigned
     continue      for         signed       void
     default       goto        sizeof       volatile
     do            if          static       while

Some implementations also reserve the words fortran and asm.

The keywords const, signed, and volatile are new with the ANSI standard; enum and void are new since the first edition, but in common use; entry, formerly reserved but never used, is no longer reserved.