In Compaq Fortran 77, you can specify the following form for a
record specifier in an I/O control list:
'r
- r
- Is a numeric expression with a value that represents the
position of the record to be accessed using direct access I/O. The
value must be greater than or equal to 1, and less than or equal to
the maximum number of records allowed in the file. If necessary, a
record number is converted to integer data type before being used.
If this nonkeyword form is used in an I/O control list, it must
immediately follow the nonkeyword form of the logical specifier.