(boole)

(boundp) →

(boole function integer1 integer2 ...)

Apply the bitwise Boolean function.

This function applies the bitwise Boolean function. The function argument is an integer between 0 and 15; it represents the 16 possible Boolean functions in two variables. Each bit of integer1 is paired with the corresponding bit of integer2.

The following shows the Boolean truth table:

integer1	integer2	function
1	1	1
1	0	2
0	1	4
0	0	8

The following values of function are the AND, XOR, OR, and NOR Boolean operators:

Function	Operation	Resulting bit is 1 when
1	AND	Both input bits are 1.
6	XOR	Only one of the two input bits is 1.
7	OR	Either or both of the input bits are 1.
8	NOR	Both input bits are 0 (1's complement).

Examples

Code	Returns
Logical AND: (boole 1 10 9)	8
Logical XOR: (boole 6 10 9)	3
Logical OR (boole 7 10 9)	11
Logical NOR: (boole 8 10 9)	-12

Tell me about...

Programming Overview of LISP (LISt Processing) Language