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FORTRAN-80
FORTRAN
Concepts
•
Statement
function names
• Intrinsic function names
•
Dummy
procedure
names
Variables
appearing
as
dummy
arguments
in a statement function have a scope
of
that
statement
only.
Common
block names
are
generally global,
but
do
admit
exceptions. A
common
block
name
in a
program
unit
may
also be the
name
of
any local entity
other
than
an
intrinsic function in a function
subprogram.
An
intrinsic function
name
may
be used
as a
common
block
name,
however,
if
the
program
unit does not reference
that
function.
If
a
name
is
used for
both
a
common
block
and
a local entity, its ap-
pearance
identifies only the local entity except in
COMMON
and
SAVE statements.
2.3 Notational Conventions
This
manual
uses the following
notational
conventions to describe
FORTRAN-80
statements
and
concepts:
• Special characters from the
FORTRAN
character
set, uppercase letters,
and
uppercase words (keywords)
are
to
be
written as shown, except where otherwise
noted.
• Lowercase letters
and
words indicate nonspecific arguments for which specific
items must be substituted in actual statements.
• Brackets [ ]
are
used to indicate
optional
items.
• Ellipses (
...
) indicate
that
the preceding
optional
items can
appear
one
or
more
.times in succession.
• Blanks are used to improve readability,
but
have no significance.
As
an
example
of
the
notation
used, the description
CALL
sub
[ ([arg[,arg]
...
] ) ]
means the following forms
of
the
CALL
statement
are
permissible:
CALL
sub
CALL
sub
( )
CALL
sub
(arg)
CALL
sub
(arg, arg)
CALL
sub
(arg, arg, arg)
etc.
When
the actual
CALL
statement
is
written, specific entities would be substituted
for
'sub'
and
each
'arg.'
CALL
ROUT1(A, 3.72, 4.12)
2-13