zerop number → generalized-boolean

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number — a number.

generalized-boolean — a generalized boolean.

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.

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

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

(zerop number) ≡ (= number 0)