Sequential READ statements transfer input data from external
sequential-access records. The statements can be formatted with
format specifiers (which can use list-directed formatting) or
namelist specifiers (for namelist formatting), or they can be
unformatted.
Sequential READ statements take one of the following forms:
Formatted
READ (eunit, format [,advance] [,size] [,iostat] [,err] [,end] [,eor]) [io-list]
READ form [,io-list]
Formatted: List-Directed
READ (eunit, * [,iostat] [,err] [,end]) [io-list]
READ * [,io-list]
Formatted: Namelist
READ (eunit, nml-group [,iostat] [,err] [,end])
READ nml
Unformatted
READ (eunit [,iostat] [,err] [,end]) [io-list]
- eunit
- Is an external unit specifier ([UNIT=]io-unit).
- format
- Is a format specifier ([FMT=]format).
- advance
- Is an advance specifier (ADVANCE=c-expr). If the value
of c-expr is 'YES', the
statement uses advancing input; if the value is 'NO',
the statement uses nonadvancing input. The
default value is 'YES'.
- size
- Is a character count specifier (SIZE=i-var). It can only be
specified for nonadvancing READ statements.
- iostat
- Is a status specifier (IOSTAT=i-var).
- err, end, eor
- Are branch specifiers if an error (ERR=label), end-of-file
(END=label), or end-of-record (EOR=label) condition occurs.
EOR can only be specified for nonadvancing READ statements.
- io-list
- Is an I/O list.
- form
- Is the nonkeyword form of a format specifier (no FMT=).
- *
- Is the format specifier indicating list-directed formatting.
(It can also be specified as FMT=*.)
- nml-group
- Is a namelist specifier ([NML=]group) indicating namelist
formatting.
- nml
- Is the nonkeyword form of a
namelist specifier (no NML=) indicating namelist formatting.
For More Information:
- On I/O control-list specifiers, see Section 10.2.1.
- On I/O lists, see Section 10.2.2.
- On advancing I/O, see Section 10.2.1.9 and your user manual or programmer's guide.
- On file sharing, see your user manual or programmer's
guide.
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