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(/= item1 item2 ...)

The two aren't equal.

This function tells you if two items are not equal:

    • If item1 does not equal item2, this function returns a T (true).
    • If the two items are equal, this function returns nil (false).

When more than two items are given, each item must be different to return a T. The items can be numbers or strings.


This expression Returns
(/= 5 4) T
(/= 8.0 8) nil
(/= "x" "x" "x") nil
(/= "x" "x" "y") nil
(/= "x" "y" "z") T
(/= 5) T

NOTE Comparison statements (such as = (equal to operator) and < (less than operator) are typically used together with conditional statements, such as if...then, while, and cond. The comparisons let you test a pair of conditions (for example, does i= 0) to know when to exit the conditional (for example, while i > 0).

(< item1 item2 ...)

(<= item1 item2 ...)

(= item1 item2 ...)

(> item1 item2 ...)

(>= item1 item2 ...)

(if test statement1 [statement2])

(while text statement )

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language

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