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DATATYPE PREDICATES

Since data types need not be declared, Lisp provides predicates for dynamically querying the system.

atom

numberp ---------- floatp

symbolp integerp

listp ratiop

zerop

plusp

minusp

evenp

oddp

>

<

( < datatype > x ) returns T if x is

of that type, else NIL.

1.47

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