CLHS: Function EVENP, ODDP

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Function EVENP, ODDP

Syntax:

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

Side Effects: None.

Affected By: None.

Exceptional Situations:

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

See Also: None.

Notes:

     (evenp integer) ==  (not (oddp integer))
     (oddp integer)  ==  (not (evenp integer))

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