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FORTRAN-SO
SOSO/SOS5
Processor
Dependencies
If
the
FREEFORM
compiler
control
is
set,
column
1
is
interpreted
as follows:
Column
1
Cor
*
0-9
Space
or
TAB
&
$
Meaning
Comment
line (same as
standard)
Label followed by
statement
Unlabeled
initial line
of
statement
Continuation
line
of
statement
Compiler
control
line
Note
in this
format
that
a
statement
label,
if
present
must
begin in
column
1.
Statements
can be written in
columns
2-72. They can begin in
column
1
if
the first
letter
of
the
statement
is
not a
'C.'
F .2.5 I nterpretation of DO Statements
The
1966
ANSI
FORTRAN
standard
states
that
all
DO
loops
must
be executed
at
least once.
The
1977
ANS
standard
allows zero iterations,
if
so specified by the
values
of
the initial
and
terminal
expressions
('el'
and
'e2'
in the
DO
statement
for-
mat).
The
preferred
interpretation
can
be specified by choosing either the
D066
compiler
control
or
the
D077
compiler
control
in
the
form
$0077
If
neither
is
specified,
D077
is
assumed
by the compiler.
If
specified, this
control
must
precede all
FORTRAN
code.
F.2.6 Default Data Lengths
The
STORAGE
compiler
control
can be used
to
specify the
default
lengths (in bytes)
to
be used
for
integer
or
logical variables,
array
elements,
and
constants.
The
default
can still be overriden by
INTEGER
or
LOGICAL
type
statements
or,
in the case
of
integer
constants,
by
the
number
of
digits in
an
explicit
number
base specification.
This
compiler
control
is
coded
in the
form
$STORAG
E(I
NTEG
ER
*
length,
lOG
ICAl
* length)
where
length
can
be
1,2,
or
4
The
'$'
must
appear
in
column
one
and
the
control
must
precede all
program
units in
the source file.
If
no
STORAGE
control
is
specified, the compiler assumes the following defaults:
$STORAGE(INTEGER*2,lOGICAl
*1)
These
defaults
do
not
conform
to
the
ANSI standard
memory
allocation.
To
be
totally
ANSI
compatible,
specify
$STORAGE(INTEGER*4,lOGICAl
*4)
F.2.7 Including Source Files
Specified files
can
be included in a
FORTRAN
source file using the
INCLUDE
com-
piler
control.
This
control
causes
subsequent
source code
to
be
input
from the
specified
'file'
until
an
end-of-file is reached.
At
end-of-file,
input
resumes
from
the
file being processed when
the
INCLUDE
was
encountered.
F-3