Open Watcom FORTRAN 77 Language Reference

Format
Omitting the asterisk and format specification also indicates list-directed formatting.
Example:
READ, X, Y, Z
PRINT, X, Y, Z
Records used during list-directed formatting are called list-directed records. A list-directed record is a
sequence of values and value separators. Any sequence of blanks is treated as a single blank except when it
appears in a character constant. The end of a record has the same effect as a blank character.
A value is one of the following:
where:
1. A constant.
2. A null value.
3. r*c
4. r*
r
c
is an unsigned, nonzero integer constant.
is a constant.
The r*c form is equivalent to r successive occurrences of c. The r* form is equivalent to r successive
occurrences of the null value. In these two forms, blanks are permitted only where they are allowed in the
constant c.
A value separator is one of the following:
1. A comma preceded and followed by any number of blanks.
2. A slash preceded and followed by any number of blanks. A slash as a value separator terminates
the execution of the input statement. The definition status of the remaining input items in the
input list remains the same as it was prior to the input statement.
3. Any number of blanks between two values.
A null value is specified by having no character between successive value separators, no characters
preceding the first value separator in a record or the r* form. It has no effect on the current value of the
input item. Note that the end of record following a value separator does not specify a null value.
11.9.1 List-Directed Input
The input forms acceptable to format specifications for a given type are also acceptable for list-directed
formatting with certain exceptions.
1. Blanks are never used as zeroes and blanks embedded in constants are not allowed except in
character constants.
2. An input item of type real or double precision must have an input field suitable for F editing
except that no fractional digits are assumed unless a decimal point is present in the field. Such a
field will be called a numeric input field.
List-Directed Formatting 239