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