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FORTRAN-SO
Intrinsic Functions
B.2
Notes
On
Intrinsic Functions
I.
For
an
integer
argument,
'int(a) =
a.'
For
a real
argument,
two possibilities
exist.
If
lal
<
I,
int(a) = 0;
if
lal
~
I,
'int(a)'
is
the integer whose
magnitude
is
the largest Integer
that
does not exceed the
magnitude
of
'a'
and
whose sign
is
the same as the sign
of
'a.'
For
example,
int(-12.8) =
-12
For
an
argument
of
type real,
'IFIX(a)'
is
the same as
'INT(a).'
2.
For
a real
argument,
'REAL(a)'
is
'a.'
For
an
integer
argument,
'REAL(a)'
is
as
much
precision
of
the significant
part
of
'a'
as a real
datum
can
contain.
For
a real
argument,
'FLOAT(a)'
is
the same as
'REAL(a).'
3.
ICHAR
provides a way to convert from characters to integers, based on the
position
of
the
character
in the processor collating sequence (Appendix E).
The
first
character
in the collating sequence corresponds
to
position 0
and
the last to
position
'n-I,'
where
'n'
is
the
number
of
characters in the collating sequence.
The
value
of
ICHAR(a)
is
an
integer in the range 0
:5
ICHAR(a)
:5
n-I,
where
'a'
is
an
argument
of
type character
and
length one. The value
of
'a'
must be a
character
capable
of
representation in the processor.
4.
The
result for
MOD
and
AMOD
is
undefined when the value
of
the second
argument
is
zero.
5.
If
the value
of
the first
argument
of
ISIGN
or
SIGN
is
zero, the result
is
zero
(which
is
neither positive
nor
negative).
6.
The
absolute
value
of
the
argument
of
SIN,
COS,
and
TAN
is
not restricted
to
be less
than
2*PI.
7.
The
absolute value
of
the
argument
of
ASIN must be
:5
1.
The
range
of
the
result
is
-PII2
:5
result
:5
PII2.
8.
The
absolute value
of
the
argument
of
ACOS
must be
:5
I.
The
range
of
the
result
is
0
:5
result
:5
PI.
9.
The
range
of
the result for
ATAN
is
-PII2
:5
result
:5
PII2.
If
the value
of
'aI'
is
positive, the result
is
positive,
and
vice-versa.
If
the value
of
'aI'
is
zero, the
result
is
zero
if
'a2'
is
positive,
and
'PI'
if
'a2'
is
negative.
If
'a2'
is
zero, the ab-
solute value
of
the result
is
PII2.
Both arguments
cannot
be zero.
The
range
of
the result for
ATAN2
is
-PI
:5
result
:5
PI.
B-3