12.2.30 evenp, oddp [Function]

evenp integer ⇒ generalized-boolean

oddp integer ⇒ generalized-boolean

Arguments and Values::

integer—an integer.

generalized-boolean—a generalized boolean.

Description::

evenp returns true if integer is even (divisible by two); otherwise, returns false.

oddp returns true if integer is odd (not divisible by two); otherwise, returns false.

Examples::

 (evenp 0) ⇒  true
 (oddp 10000000000000000000000) ⇒  false
 (oddp -1) ⇒  true

Exceptional Situations::

Should signal an error of type type-error if integer is not an integer.

Notes::

 (evenp integer) ≡ (not (oddp integer))
 (oddp integer)  ≡ (not (evenp integer))