evenp, oddp (Function)

Syntax:

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))