Common Lisp Extensions
9.1 Predicates on Numbers
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.
