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 14.