Arithmetic Predicates

numberp object [function]

T if object is number, namely integer or float. Note that characters are also represented by numbers.

integerp object [function]

T if object is an integer number. A float can be converted to an integer by round, trunc and ceiling functions.

floatp object [function]

T if object is a floating-point number. An integer can be converted to a float by the float function.

zerop number [function]

T if the number is integer zero or float 0.0.

plusp number [function]

equivalent to ($>$ number 0).

minusp number [function]

equivalent to ($<$ number 0).

oddp integer [function]

The argument must be an integer. T if integer is odd.

evenp integer [function]

The argument must be an integer. T if integer is an even number.

/= n1 n2 [function]

Both n1 and n2 must be numbers. T if n1 is not equal to n2.

= num1 num2 &rest more-numbers [function]

Both n1 and n2 must be numbers. T if n1 is equal to n2.

$>$ num1 num2 &rest more-numbers [function]

$<$ num1 num2 &rest more-numbers [function]

$>=$ num1 num2 &rest more-numbers [function]

$<=$ num1 num2 &rest more-numbers [function]

These comparisons can only be applicable to numbers. For numerical comparisons with tolerance, use functions prefixed by eps as described in the section 16.