Pronunciation

pronounced ’z\=e (, )r\=o(, )p\=e

Arguments and Values

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)

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