evenp (ANSI and GNU Common Lisp Document)

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#### 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))