LISP 中的算术运算符

算术运算运算符用于执行数学运算，如加法、减法、乘法和除法。

LISP 中有 7 个算术运算运算符，如下表所示：

Operator	Syntax	Description
Addition Operator(+)	+ num1 num2	Add the two numbers
Subtraction Operator(-)	– num1 num2	Subtract the second number from the first number
Multiplication(*)	* num1 num2	Multiply two numbers
Division(/)	/  num1 num2	Divide the two numbers
Modulus(mod)	mod num1 num2	Get the remainder of two numbers
Increment(incf)	incf  num value	Increment number by given value
Decrement(decf)	decf num value	Decrement number by given value

示例 1：演示算术运算运算符的LISP 程序

Lisp

;set value 1 to 300
; set value 2 to 600
(setq val1 300)
(setq val2 600)
  
;addition operation
(print (+ val1 val2))
  
;subtraction operation
(print (- val1 val2))
  
;multiplication operation
(print (* val1 val2))
  
;division operation
(print (/ val1 val2))
  
;modulus operation
(print (MOD val1 val2))
  
;increment a by 10
(print (incf val1 val2))
  
;decrement b by 20
(print (decf val1 val2))

输出：

900  
-300  
180000  
1/2  
300  
900  
300 

示例 2：

Lisp

;set value 1 to 30
; set value 2 to 15
(setq val1 30)
(setq val2 15)
  
;addition operation
(print (+ val1 val2))
  
;subtraction operation
(print (- val1 val2))
  
;multiplication operation
(print (* val1 val2))
  
;division operation
(print (/ val1 val2))
  
;modulus operation
(print (MOD val1 val2))
  
;increment a by 10
(print (incf val1 val2))
  
;decrement b by 20
(print (decf val1 val2))

输出：

45  
15  
450  
2  
0  
45  
30