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FORTRAN-SO
The list
of
control
information
specifiers is:
[UNIT
=]
unit
[FMT
=]
f
REC
= recno
IOSTAT =
stname
ERR
=
stl
END =
stl
6.3.1.1
Control
Information
List
U nit specifier
Format
specifier
Record
number
specifier
I/O
status specifier
Error
specifier
End-of-file specifier
The control
information
list must contain a unit specifier.
If
the second form
of
the
READ
statement shown above
is
used (that is,
if
no unit
is
specified), the unit read
is
the default unit.
The
'ctl-list'
may
contain, at most, one
of
each
of
the
other
specifiers.
The following sections 6.3.1.1.1
through
6.3.1.1.6 describe control list specifiers in
detail.
6.3.1.1.1
Unit Specifier.
The
unit specifier has the same interpretation as for the
OPEN
statement (section 6.2.1.1). In addition, for
data-transfer
I/O
statements,
'unit'
may be
an
asterisk.
If
this
is
the case, the specifier identifies a particular
processor-determined external unit.
The unit specifier may also point
to
an
internal file (that is,
'unit'
may be the name
of
a character variable, character array,
or
character
array
element name). In this
case, 'ctl-list' must contain a
format
identifier (other
than
asterisk)
and
may
not
contain a record
number
specifier.
If
the optional
'UNIT
='
is
omitted, the unit specifier must be the first item in 'ctl-
list.'
Example:
READ
(2)
PNAME, AB, HITS
6.3.1.1.2
Format
Specifier.
If
'ctl-list' contains a
format
specifier, the
READ
state-
ment
is
aformatted
I/O
statement; otherwise, it
is
an
unformatted
I/O
statement.
The
format
of
this specifier
is
[FMT
=]f
where
'f'
is
one
of
the following:
• The label
of
a
FORMAT
statement in the same
program
unit as the READ;
•
An
integer variable ASSIGNed the label
of
a
FORMAT
statement;
• A character
array
name, character variable name,
or
character expression
containing a
format
specification;
•
An
asterisk (*) specifying list-directed formatting (section 6.4.4);
•
An
integer, real,
or
logical
array
containing a
format
specification as Hollerith
data.
If
the optional
'FMT
='
is
omitted, the
format
specifier must be the second item in
'ctl-list'
and
the first item must be the unit specifier without the optional characters
'UNIT
=.'
Input/Output
6-11