and

Date:

10-12-2011

NAME

AND - Computes logical product

SYNOPSIS

AND ([I=]i,[J=]j)

STANDARDS

Fortran extension

DESCRIPTION

AND is an elemental function. It accepts the following arguments:

i

Must be of type Boolean, integer, real, Cray pointer, or logical.

j

Must be of type Boolean, integer, real, Cray pointer, or logical.

NOTES

AND is an outmoded routine. Refer to the Cray Fortran Reference Manual 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.

RETURN VALUES

When given two arguments of type logical, AND computes a logical product and returns a logical result.

When given two arguments of type Boolean, integer, real, or pointer, AND computes a bit-wise logical product and returns a Boolean result.

The following tables show both the logical product and bit-wise logical product:

-------------------------------------------------------
Logical       Logical       (Logical Variable 1) AND
Variable 1    Variable 2    (Logical Variable 2)
-------------------------------------------------------
T             T             T
T             F             F
F             T             F
F             F             F
-------------------------------------------------------

-------------------------------------------------------
Bit of        Bit of       (Bit of Variable 1) AND
Variable 1    Variable 2   (Bit of Variable 2)
-------------------------------------------------------
1             1             1
1             0             0
0             1             0
0             0             0
-------------------------------------------------------

EXAMPLES

The following section of Fortran code shows the AND function used with two arguments of type logical:

LOGICAL L1, L2, L3
. . .
L3 = AND(L1,L2)

The following section of Fortran code shows the AND function used with two arguments of type integer. The bit patterns of the arguments and result are also given. For clarity, only the rightmost 8 bits are shown.

INTEGER I1, I2, I3
I1 = 12
I2 = 10
. . .
I3 = AND(I1,I2)
 -------------------------------     -------------------------------
| 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 |   | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 |
 -------------------------------     -------------------------------
                  I1                               I2
                  -------------------------------
                 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
                  -------------------------------
                                  I3