FORTRAN, Statements, INQUIRE
*Conan The Librarian (sorry for the slow response - running on an old VAX)
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VMS Help FORTRAN, Statements, INQUIRE *Conan The Librarian (sorry for the slow response - running on an old VAX) |
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Returns information about specified properties of a file or of a
logical unit on which a file might be opened. The unit need not
exist, nor need it be connected to a file. If the unit is
connected to a file, the inquiry encompasses both the connection
and the file. Statement format:
INQUIRE ([FILE=fi][,DEFAULTFILE=dfi...],flist)
INQUIRE ([UNIT=]u,flist)
fi Is a character expression, numeric scalar memory
reference, or numeric array name reference whose
value specifies the name of the file to be
inquired about.
dfi Is a character expression specifying a default file
specification string. Parts of the file specification
not specified in FILE are filled in from DEFAULTFILE.
Parts of the file specification that are still missing
are filled in from your default directory when the
program runs.
flist Is a list of property specifiers in which any one
specifier appears only once. Information about the
individual specifiers is available under the
subtopic headings listed at the end of this Help
topic.
u Is an integer variable or constant specifying the
logical unit number of the file, optionally prefaced
by UNIT=. UNIT= is required if unit is not the
first I/O specifier. The unit does not have to
exist, nor does it need to be connected to a file.
If the unit is connected to a file, the inquiry
encompasses both the connection and the file.
FILE=fi and UNIT=u can appear anywhere in the property-specifier
list; however, if the UNIT keyword is omitted, the unit specifier
("u") must be the first parameter in the list.
When inquiring by file, you can specify DEFAULTFILE=dfi in addition
to, or in place of, FILE=fi. If a file is open with both FILE and
DEFAULTFILE keywords specified in the OPEN statement, then you can
inquire about this file by specifying both the FILE and DEFAULTFILE
keywords in the INQUIRE statement.
An INQUIRE statement can be executed before, during, or after the
connection of a file to a unit. The values assigned by the
statement are those that are current when the INQUIRE statement
executes.
You can use INQUIRE to get file characteristics before opening a
file. (File characteristics are stored in the file header.)
Additional Information (explode) :
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