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Annotation of 43BSDTahoe/new/help/src/f77/io_random, revision 1.1

1.1     ! root        1: .TI F77/IO_RANDOM "Sep. 15, 1984"
        !             2: Random Access I/O
        !             3: 
        !             4: F77 allows files to be accessed by both sequential and direct (random)
        !             5: access reads and writes.
        !             6: For example, suppose you want
        !             7: to use random access I/O on unit 10 with records that are 20 bytes
        !             8: long.
        !             9: Open unit 10 by:
        !            10: 
        !            11: .nf
        !            12:        open(10, file='randfile', form='unformatted',
        !            13:        .       access='direct', recl=20 )
        !            14: .fi
        !            15: 
        !            16: Write to it by:
        !            17: 
        !            18: .nf
        !            19:        real vec(5)
        !            20:           ...
        !            21:        write(10, rec=n) vec
        !            22: .fi
        !            23: 
        !            24: and read from it by:
        !            25: 
        !            26:        read(10, rec=n) vec
        !            27: 
        !            28: where n contains the record number being read or written.
        !            29: The f77 I/O library
        !            30: keeps track of the highest record number written to the file.
        !            31: Any time
        !            32: a write specifies a higher record number, the file is extended.
        !            33: If a
        !            34: read specifies a higher record number, an end-of-file error results.
        !            35: Records not explicitly written contain zeros.

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