# Index U

    UBOUND function,  [+], [+]
      in pointer assignment, [+]
    ULTRIX f77
      source program compatibility, [+]
    Unambiguous generic references,  [+]
    Unary operations,  [+]
    Unary operators (+ and -),  [+]
      definition of, [+]
      form of, [+]
      order of precedence of, [+]
    Unconditional
      DO statement, [+]
      GO TO statement, [+]
    Undeclared names
      See Names
    UNDEFINE directive,  [+]
    UNDEFINED value
      for INQUIRE (SHARE)
         on WNT, W9*, [+]
    Underscore character (_)
      in names, [+]
    Unformatted data
      See also your user manual or programmer's guide
      specifying nonnative numeric format for
         on U*X, WNT, W9*, [+], [+]
         on VMS, [+], [+]
    Unformatted I/O statements
      READ
         direct access, [+], [+]
         indexed (VMS), [+], [+]
         sequential, [+], [+]
      REWRITE, [+]
      using aggregate field references in, [+]
      WRITE
         direct access, [+], [+]
         indexed (VMS), [+], [+]
         sequential, [+], [+]
    Unformatted records
      definition of, [+]
    UNFORMATTED specifier
      in INQUIRE statements
         on U*X, WNT, W9*, [+]
         on VMS, [+]
    UNFORMATTED value
      for INQUIRE (FORM)
         on U*X, WNT, W9*, [+]
         on VMS, [+]
      for OPEN (FORM)
         on U*X, WNT, W9*, [+]
         on VMS, [+]
    Union declarations,  [+]
      compared to EQUIVALENCE statement, [+]
      initializing data in, [+]
      size of shared area, [+]
    UNION statement,  [+]
      using to make record fields equivalent, [+]
    Unit number
      assignment of, [+]
    Units
      See Program unit
      See also Scoping units
    UNIT specifier,  [+]
    UNKNOWN value
      for OPEN (STATUS)
         on U*X, WNT, W9*, [+]
         on VMS, [+]
    Unlocking records
      on U*X, WNT, W9*, [+]
      on VMS, [+]
    UNLOCK statements
      on U*X, WNT, W9*, [+]
      on VMS, [+]
    Unpacked array
      function to create, [+]
    UNPACK function,  [+], [+]
    UNROLL directive,  [+]
    Unspecified storage unit,  [+]
    Upper bounds
      function returning, [+]
    Uppercase letters
      in character set, [+]
      treatment on compiler, [+]
    Use association,  [+], [+]
    User-defined
      data types
         See Derived data types
      elemental procedures, [+]
      pure procedures, [+]
    USEROPEN specifier
      in OPEN statements
         on U*X, WNT, W9*, [+]
         on VMS, [+]
    User-written subprograms
      for opening files
         on U*X, WNT, W9*, [+]
      types of, [+]
    USE statement,  [+], [+]
      ONLY keyword in, [+]

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