# Equality and Conditional Functions Reference (AutoLISP)

The following table provides summary descriptions of the AutoLISP equality and conditional functions.

Equality and conditional functions

Function

Description

(= numstr [numstr ...])

Returns T if all arguments are numerically equal, and returns nil otherwise

(/= numstr [numstr ...])

Returns T if the arguments are not numerically equal, and nil if the arguments are numerically equal

(< numstr [numstr ...])

Returns T if each argument is numerically less than the argument to its right, and returns nil otherwise

(<= numstr [numstr ...])

Returns T if each argument is numerically less than or equal to the argument to its right, and returns nil otherwise

(> numstr [numstr ...])

Returns T if each argument is numerically greater than the argument to its right, and returns nil otherwise

(>= numstr [numstr ...])

Returns T if each argument is numerically greater than or equal to the argument to its right, and returns nil otherwise

(and [expr ...])

Returns the logical AND of a list of expressions

(boole func int1 [int2 ...])

Serves as a general bitwise Boolean function

(cond [(test result ...) ...])

Serves as the primary conditional function for AutoLISP

(eq expr1 expr2)

Determines whether two expressions are identical

(equal expr1 expr2 [fuzz])

Determines whether two expressions are equal

(if testexpr thenexpr [elseexpr])

Conditionally evaluates expressions

(or [expr ...])

Returns the logical OR of a list of expressions

(repeat int [expr ...])

Evaluates each expression a specified number of times, and returns the value of the last expression

(while testexpr [expr ...])

Evaluates a test expression, and if it is not nil, evaluates other expressions; repeats this process until the test expression evaluates to nil