| <Syntax> |
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OPEN ( open-spec [ , open-spec ]... )
The possible open-specs are listed in the table in the section below.
In UNIT=, the keyword and equals sign may be omitted if it is the first open-spec.
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| <Semantics> |
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The OPEN statement connects a file to a unit with the specified properties.
The meaning of each open-spec specifier is as follows.
Specifiers whose values are indicated as variable must be variables;
all other non-label specifier values may be expressions.
Note that upper case and lower case are considered the same in all input/output specifier values.
| Specifier |
Argument |
Meaning |
Values |
| [ UNIT= ] |
Integer |
Unit to connect to |
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| FILE= |
Character |
File to connect |
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| ACCESS= |
Character |
Access mode |
'DIRECT', 'SEQUENTIAL', 'STREAM' |
| ACTION= |
Character |
Permitted actions |
'READ', 'WRITE', 'READWRITE' |
| ASYNCHRONOUS= |
Character |
Asynchronous input/output? |
'YES', 'NO' |
| BLANK= |
Character |
Blank mode |
'NULL', 'ZERO' |
| DECIMAL= |
Character |
Decimal edit mode |
'COMMA', 'POINT' |
| CONVERT= |
Character |
Unformatted file conversion |
'BIG_ENDIAN', 'BIG_IEEE', 'BIG_IEEE_DD', 'BIG_NATIVE', 'LITTLE_ENDIAN', 'LITTLE_IEEE', 'LITTLE_IEEE_DD', 'LITTLE_NATIVE', 'NATIVE' |
| DELIM= |
Character |
String delimiter |
'QUOTE', 'NONE', 'APOSTROPHE' |
| ENCODING= |
Character |
File encoding |
'ASCII', 'DEFAULT', 'SHIFT_JIS', 'UTF-8' |
| ERR= |
Label |
Branch on error |
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| FORM= |
Character |
Formatting |
'FORMATTED', 'UNFORMATTED' |
| IOMSG= |
Character |
Error message |
variable |
| IOSTAT= |
Integer |
Error status |
variable |
| NEWUNIT= |
Integer |
New unit number |
variable |
| PAD= |
Character |
Pad short records with blanks? |
'YES', 'NO' |
| POSITION= |
Character |
Initial file position |
'APPEND', 'ASIS', 'REWIND' |
| RECL= |
Integer |
Length of record in bytes |
Greater than zero |
| ROUND= |
Character |
Rounding mode |
'COMPATIBLE', 'DOWN', 'NEAREST', 'PROCESSOR_DEFINED', 'UP', 'ZERO' |
| SIGN= |
Character |
Sign edit mode |
'PLUS', 'SUPPRESS', 'PROCESSOR_DEFINED' |
| STATUS= |
Character |
File status |
'NEW', 'OLD', 'REPLACE', 'SCRATCH', 'UNKNOWN' |
If the unit is already open to a different file, that file is closed automatically.
If the unit is already open to the same file, only the BLANK=, DECIMAL=, DELIM=, PAD= and SIGN= may have values different from the current mode.
Fortran 2003 has stream files (ACCESS='STREAM') and the additional specifiers DECIMAL=, ENCODING=, IOMSG=, ROUND= and SIGN=.
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| <Related> |
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ASYNCHRONOUS= specifier,
BACKSPACE statement,
CLOSE statement,
CONVERT= specifier,
DECIMAL= specifier,
ENCODING= specifier,
ENDFILE statement,
ERR= specifier,
INQUIRE statement,
IOMSG= specifier,
IOSTAT= specifier,
NEWUNIT= specifier,
PRINT statement,
READ statement,
REWIND statement,
ROUND= specifier,
SIGN= specifier,
UNIT= specifier,
WRITE statement |
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