FORTRAN Reference Manual

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Introduction to File I/O in the HP NonStop

Environment

FORTRAN Reference Manual—528615-001

5-17

Unstructured Files

•

All physical records are the same length.

•

All logical records are the same length.

•

You can access records sequentially or directly.

•

You can read, write, or update any record in the file but you can never delete a

record once it has been written.

•

You cannot use alternate keys.

EDIT Format Files

EDIT format files are unstructured files. Each line of an EDIT format file is a record of

that file. The record number equals the EDIT line number times 1000; for example, line

number 12.34 is record number 12340.

You can create an EDIT format file in any of the following ways:

•

Specify CODE 101 in a UNIT directive

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Specify CODE 101 in a TACL ASSIGN command

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Use the FUP utility. The following commands create the EDIT format file

CREDITOR:

In an EDIT format file:

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Physical records vary in length. The maximum length is always 239 bytes.

•

Logical records also vary in length, up to the maximum length specified when the

file is connected.

•

You can read records sequentially.

•

You can rewind the file.

•

You cannot use keyed access.

•

For a FORTRAN program running as a NonStop process pair:

You cannot write, update, or delete records in the file.

You cannot backspace over records in the file.

You cannot use direct access.

•

For a FORTRAN program that is not running as a NonStop process pair:

1> FUP

File Utility Program - T6553D10 - (08JUN92) System \ASYS

-set type u

-set code 101

-create creditor

CREATED - $AVOL.USER.CREDITOR

-exit