The following table provides summary descriptions of the AutoLISP arithmetic functions.
Arithmetic functions 


Function 
Description 
(+ (add) [numbernumber] ...) 
Returns the sum of all numbers 
( (subtract) [number number] ...) 
Subtracts the second and following numbers from the first and returns the difference 
(* (multiply)[number number] ...) 
Returns the product of all numbers 
(/ (divide)[number number] ...) 
Divides the first number by the product of the remaining numbers and returns the quotient 
(~ (bitwise NOT)int) 
Returns the bitwise NOT (1's complement) of the argument 
(1+ (increment)number) 
Returns the argument increased by 1 (incremented) 
(1 (decrement)number) 
Returns the argument reduced by 1 (decremented) 
(absnumber) 
Returns the absolute value of the argument 
(atannum1 [num2]) 
Returns the arctangent of a number in radians 
(cosang) 
Returns the cosine of an angle expressed in radians 
(expnumber) 
Returns the constant e (a real) raised to a specified power (the natural antilog) 
(exptbase power) 
Returns a number raised to a specified power 
(fixnumber) 
Returns the conversion of a real into the nearest smaller integer 
(floatnumber) 
Returns the conversion of a number into a real 
(gcdint1 int2) 
Returns the greatest common denominator of two integers 
(lognumber) 
Returns the natural log of a number as a real 
(logand [int int ...]) 
Returns the result of the logical bitwise AND of a list of integers 
(logior [intint ...]) 
Returns the result of the logical bitwise inclusive OR of a list of integers 
(lsh [intnumbits]) 
Returns the logical bitwise shift of an integer by a specified number of bits 
(max [number number ...]) 
Returns the largest of the numbers given 
(min [number number ...]) 
Returns the smallest of the numbers given 
(minuspnumber) 
Verifies that a number is negative 
(rem [num1 num2 ...]) 
Divides the first number by the second, and returns the remainder 
(sinang) 
Returns the sine of an angle as a real expressed in radians 
(sqrtnumber) 
Returns the square root of a number as a real 
(zeropnumber) 
Verifies that a number evaluates to zero 