OR(3M) Last changed: 1-6-98
NAMEOR - Computes logical sum
SYNOPSISOR ([I=]i,[J=]j)
IMPLEMENTATION
UNICOS, UNICOS/mk, and IRIX systems
STANDARDS
Compiler extension to Fortran 90
DESCRIPTIONOR is an elemental function for the CF90 compiler.
arg, i, or j can be of type Boolean, integer, real, logical, or Cray
pointer.
NOTES
This is an outmoded routine for the CF90 compiler. Refer to the
Fortran Language Reference Manual, Volume 3, publication SR-3905, for
information about outmoded features and their preferred standard
alternatives.
The name of this intrinsic cannot be passed as an argument.
CAUTIONS
Unexpected results can occur when Boolean functions are declared
external and then used with logical arguments. The external Boolean
functions always treat their arguments as type Boolean and return a
Boolean result on UNICOS and UNICOS/mk systems. On IRIX systems, they
return an integer result.
RETURN VALUES
When given two arguments of type logical, OR computes a logical sum
and returns a logical result.
When given two arguments of type integer, real, Boolean, or pointer,
OR computes a bit-wise logical sum and returns a Boolean result. No
type conversion occurs.
The following tables show both the logical sum and bit-wise logical
sum:
-----------------------------------------------------------------
Logical Logical (Logical Variable 1) OR
Variable 1 Variable 2 (Logical Variable 2)
-----------------------------------------------------------------
T T T
T F T
F T T
F F F
-----------------------------------------------------------------
--------------------------------------------------------------
Bit of Bit of (Bit of Variable 1) OR
Variable 1 Variable 2 (Bit of Variable 2)
--------------------------------------------------------------
1 1 1
1 0 1
0 1 1
0 0 0
--------------------------------------------------------------
EXAMPLES
The following section of Fortran code shows the OR function used with
two arguments of type logical:
LOGICAL L1, L2, L3
...
L3 = OR(L1,L2)
The following section of Fortran code shows the OR function used with
two arguments of type integer. The bit patterns of the arguments and
result are also shown. For clarity, only the rightmost 8 bits are
shown.
INTEGER I1, I2, I3
I1 = 12
I2 = 10
...
I3 = OR(I1,I2)
--------------------------------------------------------------
| 0 | | | | | | | | | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |
--------------------------------------------------------------
I1 I2
-------------------------------
| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 |
-------------------------------
I3
SEE ALSO
Intrinsic Procedures Reference Manual, publication SR-2138, for the
printed version of this man page.
