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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.18 zerop | Function
  Syntax: zerop number generalized-boolean Pronunciation: [ 'zê(')rô(')pê ] 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)
Allegro CL Implementation Details: None.

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