Determine whether a value is a negative number.
This function determines negative numbers. If number is an integer or a real number and it has a negative value, the minusp function returns a T. Otherwise it returns a nil.
Examples
| Code | Returns |
|---|---|
| (minusp -2.4) | T |
| (minusp 8.5) | nil |
| (minusp -26) | T |
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Programming Overview of LISP (LISt Processing) Language
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