Equality and Conditional Functions Reference (AutoLISP)

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

Equality and conditional functions		Platforms
		Windows		Mac OS		Web
Function	Description	AutoCAD	AutoCAD LT	AutoCAD	AutoCAD LT	AutoCAD
(= 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	✓	✓	✓	--	✓