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FORTRAN-SO
Functions
And
Subroutines
NOTE
In a given
program
unit,
det~rmining
whether
a
dummy
procedure
is
associated
with a
function
or
a
subroutine
may
not
be possible.
If
a
pro-
cedure
name
appears
only
in a
dummy
argument
list,
an
EXTERNAL
statement,
and
an
actual
argument
list,
examining
the
subprogram
is
not
enough
to
determine
whether
the
symbolic
name
should
be
associated
with a
subroutine
or
a
function.
A
dummy
argument
associated
with
an
intrinsic
function
has
no
automatic
type
association.
Therefore,
the
type
of
the
dummy
argument
must
agree
with
the
type
of
the
result
of
all
actual
arguments
associated
with it.
An
intrinsic
function
name
used
as a
dummy
external
function
name
loses its
property
as
an
intrinsic
function
within
the
subprogram.
A
dummy
argument
associated
with
an
intrinsic
function
and
used
as a
procedure
name
in a
function
reference
must
have
arguments
that
agree in
number
and
type
with
those
specified
for
the
intrinsic
function.
5.3.3.5
Argument Association Limitations
If
dummy
arguments
in
the
same
subprogram
are
associated
as
the
result
of
a
reference
to
that
subprogram,
neither
dummy
can
be
redefined
during
execution
of
the
subprogram.
For
example,
an
external
function
beginning with
FUNCTION F(A,B,C)
could
not
be
referenced
by
F(X,
Y,
X)
because'
A'
and
'C'
would
become
associated.
If
a
subprogram
reference
causes a
dummy
argument
to
become
associated
with
an
item in a
common
block
in
the
same
subprogram,
neither
the
dummy
nor
the
com-
mon
item
can
be
redefined
within
the
subprogram.
5-11