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Comparison Operators in LISP

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  • Last Updated : 07 Sep, 2021

In this article, we will discuss the comparison operators in LISP. These operators are used to compare numbers by taking two or more operands.

Note: This will work only on numbers,

Different comparison operators are:

Operator Syntax Name Description
= = operand1 operand2 equal to This operator checks if the values of the operands are all equal or not, if yes, will return T(True) otherwise NIL
/= /= operand1 operand2 not equal to This operator checks if the values of the operands are not equal, if yes, will return NIL otherwise T (True)
> > operand1 operand2 greater than This operator checks if the values of the operand 1 are greater than operand 2, if yes then it returns True, otherwise NIL
< <operand1 operand2 less than This operator checks if the values of the operand 1 are less than operand 2, if yes then it returns True, otherwise NIL
>= >= operand1 operand2 greater than or equal to This operator checks if the values of the operand 1 are greater than or equal to  operand 2, if yes then it returns True, otherwise NIL
<= <= operand1 operand2 less than or equal to This operator checks if the values of the operand 1 are less than or equal to  operand 2, if yes then it returns True, otherwise NIL
max max operand1 operand2 maximum number This operator returns the maximum value.
min min operand1 operand2 minimum number This operator returns the minimum value.

Example: LISP Program demo on comparison operators.

Lisp




;set value 1 to 100
; set value 2 to 200
(setq val1 100)
(setq val2 200)
  
;check val1 is equal to val2 or not
(print (= val1 val2))
  
;check val1 is not equal to val2 or not
(print (/= val1 val2))
  
;check val1 is greater than val2 or not
(print (> val1 val2))
  
;check val1 is less than val2 or not
(print (< val1 val2))
  
;check val1 is greater than or equal to val2 or not
(print (>= val1 val2))
  
;check val1 is less than or equal to val2 or not
(print (<= val1 val2))
  
;get maximum number among val1 and val2
(print (max val1 val2))
  
;get minimum number among val1 and val2
(print (min val1 val2))


Output:

NIL  
T  
NIL  
T  
NIL  
T  
200  
100 

Example 2:

Lisp




;set value 1 to 20
; set value 2 to 70
(setq val1 20)
(setq val2 70)
  
;check val1 is equal to val2 or not
(print (= val1 val2))
  
;check val1 is not equal to val2 or not
(print (/= val1 val2))
  
;check val1 is greater than val2 or not
(print (> val1 val2))
  
;check val1 is less than val2 or not
(print (< val1 val2))
  
;check val1 is greater than or equal to val2 or not
(print (>= val1 val2))
  
;check val1 is less than or equal to val2 or not
(print (<= val1 val2))
  
;get maximum number among val1 and val2
(print (max val1 val2))
  
;get minimum number among val1 and val2
(print (min val1 val2))


Output:

NIL  
T  
NIL  
T  
NIL  
T  
70  
20 

Example 3: LISP program operands with equal numbers.

Lisp




;set value 1 to 50
; set value 2 to 50
(setq val1 50)
(setq val2 50)
  
;check val1 is equal to val2 or not
(print (= val1 val2))
  
;check val1 is not equal to val2 or not
(print (/= val1 val2))
  
;check val1 is greater than val2 or not
(print (> val1 val2))
  
;check val1 is less than val2 or not
(print (< val1 val2))
  
;check val1 is greater than or equal to val2 or not
(print (>= val1 val2))
  
;check val1 is less than or equal to val2 or not
(print (<= val1 val2))
  
;get maximum number among val1 and val2
(print (max val1 val2))
  
;get minimum number among val1 and val2
(print (min val1 val2))


Output:

T  
NIL  
NIL  
NIL  
T  
T  
50  
50 

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