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ANSI Common Lisp  12 Numbers 12.2 Dictionary of Numbers
- 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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