Determine whether an item is a number.
This function tests item to see if it is a number-either a real number or an integer. If item is a number, a T is returned. If not, nil is returned.
Examples
| Code | Returns |
|---|---|
| (numberp 8) | T |
| (numberp 0.2653) | T |
| (numberp '(5 3.2 6)) | nil |
| (numberp "Name") | nil |
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Programming Overview of LISP (LISt Processing) Language
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