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))

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