Filter
Top Products
FORTRAN-80
6.4.2 Formatted Data Transfer
During
formatted
data
transfer,
data
is
transferred
with editing between the file
and
the
110
list.
The
editing
is
directed by some kind
of
format
specification.
Format
specifications can be given:
•
In
FORMAT
statements;
• As values
of
character
arrays,
character
variables,
or
other
character
expressions;
• As Hollerith values assigned
to
integer,
real,
or
logical
arrays.
I f the
format
specifier (section 6.3.1.1.2) in a
formatted
110
statement
is
a
character
array
name,
character
variable
name,
or
other
character
expression, the value
referenced
must
contain
a valid
format
specification in its leftmost
character
posi-
tions.
The
format
specification
is
described below (section 6.4.3).
Character
data
may
follow the right parenthesis
that
ends the
format
specification with no effect
on
the
format
specification itself.
The
same applies
to
Hollerith
data
in an integer, real,
or
logical
array.
6.4.2.1
Printing Formatted Records
If
a
formatted
record
is
printed
on
some external listing device, the first
character
of
the record
is
not
printed.
It
is
used instead to indicate vertical spacing.
The
remain-
ing
characters
of
the record
are
then printed beginning
at
the left margin.
When
this convention
is
specified,
the
first
character
is
interpreted
as follows:
Character
Blank
o
I
+
Vertical Spacing
One
line
Two
lines
Ski p
to
next page
No
advance
This-interpretation is requested by
the
CARRIAGE
specifier
of
the
OPEN
statement
(section 6.2.1.10).
If
'car'
is specified as
'FORTRAN"
the
first
character
is
inter-
preted
as vertical spacing
information
and
is
not
printed.
6.4.2.2
Format Control
The
edit descriptors
that
make
up
the
format
specification list (section 6.4.3)
are
classified as either repeatable
or
nonrepeatable.
Both the
format
specification list
and
its
corresponding
110
list
are
scanned
left
to
right.
One
item in the
110
list
corresponds
to
each
repeatable
edit descriptor.
There
is
no
corresponding
110
list item for
nonrepeatable
edit descriptors,
and
format
control
communicates
directly with the
110
record.
If
a repeatable edit descriptor
is
repeated, say five times, it
corresponds
to
five consecutive
I/O
list items.
If
a
format
specification list ends
before
the
I/O
list, it reverts to its beginning
(or
to
the left parenthesis
matching
the
rightmost
right parenthesis
if
the
format
specifica-
tion
contains
nested parentheses). Repeat specifications have the same effect as
dur-
ing the first pass
through
the
format
specification list. A new
record
is
begun each
time
format
reversion occurs.
Input/Output
6-15