zerop [Function]

zerop number => generalized-boolean

Pronunciation::

pronounced 'z\=e (, )r\=o{}(, )p\=e

Arguments and Values::

number---a number.

generalized-boolean---a generalized boolean.

Description::

Returns true if number is zero (integer, float, or complex); otherwise, returns false.

Regardless of whether an implementation provides distinct representations for positive and negative floating-point zeros, (zerop -0.0) always returns true.

Examples::

 (zerop 0) =>  true
 (zerop 1) =>  false
 (zerop -0.0) =>  true
 (zerop 0/100) =>  true
 (zerop #c(0 0.0)) =>  true

Exceptional Situations::

Should signal an error of type type-error if number is not a number.

Notes::

 (zerop number) == (= number 0)

Go to the first, previous, next, last section, table of contents.