Common LISP supports 3 types of logical operators on Boolean Values. The arguments of these operators are evaluated conditionally, therefore they are also part of the LISP control Structure.
The common LISP operators are listed below in the table:
| Operator |
Syntax |
Description |
| and |
and number1 number2 |
This operator takes two numbers which are evaluated left to right. If all numbers evaluate to non-nil, then the value of the last number is returned. Otherwise, nil is returned. |
| or |
or number1 number2 |
This operator takes two numbers which are evaluated left to right. If any one number evaluates to non-nil, then the value of the last number is returned. Otherwise, nil is returned. |
| not |
not number |
This operator takes one number and returns T(true) if the argument evaluates to NIL |
Example: LISP Program that demonstrates Logical operators on numbers
Lisp
;set value 1 to 50
; set value 2 to 50
(setq val1 50)
(setq val2 50)
;and operator
(print (and val1 val2))
;or operator
(print (or val1 val2))
;not operator with value1
(print (not val1))
;not operator with value2
(print (not val2))
|
Output:
50
50
NIL
NIL
Example 2: LISP Program to demonstrate Logical operators on Boolean values
Lisp
;set value 1 to T
; set value 2 to NIL
(setq val1 T)
(setq val2 NIL)
;and operator
(print (and val1 val2))
;or operator
(print (or val1 val2))
;not operator with value1
(print (not val1))
;not operator with value2
(print (not val2))
|
Output:
NIL
T
NIL
T
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Last Updated :
22 Oct, 2021
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