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(cl)Predicates on Numbers

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Predicates on Numbers
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These functions return `t' if the specified condition is true of the
numerical argument, or `nil' otherwise.

 - Function: plusp number
     This predicate tests whether NUMBER is positive.  It is an error
     if the argument is not a number.

 - Function: minusp number
     This predicate tests whether NUMBER is negative.  It is an error
     if the argument is not a number.

 - Function: oddp integer
     This predicate tests whether INTEGER is odd.  It is an error if
     the argument is not an integer.

 - Function: evenp integer
     This predicate tests whether INTEGER is even.  It is an error if
     the argument is not an integer.

 - Function: floatp-safe object
     This predicate tests whether OBJECT is a floating-point number.
     On systems that support floating-point, this is equivalent to
     `floatp'.  On other systems, this always returns `nil'.