Elemental Intrinsic Function (Generic): Tests a bit of an integer argument.
Syntax
Results
The result type is default logical.
The result is true if bit pos of i has the value 1. The result is false if pos has the value zero. For more information, see Bit Functions.
For information on the model for the interpretation of an integer value as a sequence of bits, see Model for Bit Data.
The setting of compiler options specifying integer size can affect this function.
Specific Name | Argument Type | Result Type |
---|---|---|
BBTEST | INTEGER(1) | LOGICAL(1) |
BITEST 1 | INTEGER(2) | LOGICAL(2) |
BTEST 2 | INTEGER(4) | LOGICAL(4) |
BKTEST | INTEGER(8) | LOGICAL(8) |
1 Or HTEST 2 Or BJTEST |
See Also
IBCLR, IBSET, IBCHNG, IOR, IEOR, IAND
Examples
BTEST (9, 3) has the value true.
If A has the value
[ 1 2 ]
[ 3 4 ],
the value of BTEST (A, 2) is
[ false false ]
[ false true ]
and the value of BTEST (2, A) is
[ true false ]
[ false false ].
The following shows more examples:
Function reference | Value of i | Result |
---|---|---|
BTEST (i,2) | 00011100 01111000 | .FALSE. |
BTEST (i,3) | 00011100 01111000 | .TRUE. |
The following shows another example:
INTEGER(1) i(2)
LOGICAL result(2)
i(1) = 2#10101010
i(2) = 2#01010101
result = BTEST(i, (/3,2/)) ! returns (.TRUE.,.TRUE.)
write(*,*) result