Open Watcom FORTRAN 77 Language Reference

Language Reference
2. An internal file identifier is the name of a character variable, character array,
character array element, or character substring.
If the optional UNIT= specifier is omitted then the unit specifier must be the first item in
the list of specifiers.
[FMT =] f
f is a format identifier. A format identifier is one of the following:
1. A statement label of a FORMAT statement that appears in the same program unit
as the format identifier.
2. An integer variable name that has been assigned the statement label of a
FORMAT statement that appears in the same program unit as the format identifier
(see the ASSIGN statement).
3. An integer array name.
4. A character array name.
5. Any character expression except one involving the concatenation of an operand
whose length specification is (*) unless the operand is a symbolic constant (see
the PARAMETER statement).
6. An asterisk (*), indicating list-directed formatting.
Open Watcom FORTRAN 77 supports a third form of the READ statement in
which the asterisk (*) may be omitted. This is a form of list-directed
formatting in which unit 5 is assumed. It is equivalent to
READ * [,ilist]
7. A NAMELIST name, indicating namelist-directed formatting.
If the optional FMT= specifier is omitted then the format specifier must be the second item
in the list of specifiers and UNIT= must not be specified for the first item in the list.
REC = rn
IOSTAT = ios
ERR = s
END = s
rn is an integer expression whose value must be positive. It is the number of the record to
be read when a file is connected for direct access.
is an input/output status specifier. The integer variable or integer array element ios is
defined with zero if no error occurs, a positive integer value if an error occurs, or a negative
integer value if an end-of-file occurs.
is an error specifier and s is a statement label. When an error occurs, execution is
transferred to the statement labelled by s.
is an end-of-file specifier and s is a statement label. When an end-of-file occurs, execution
is transferred to the statement labelled by s.
Input list - An input list may contain one or more of the following:
1. A variable name.
2. An array element name.
124 READ Statement