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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.17 minusp, plusp | Function
  Syntax: minusp real generalized-boolean plusp real generalized-boolean Arguments and Values: real - a real. generalized-boolean - a generalized boolean. Description: minusp returns true if real is less than zero; otherwise, returns false. plusp returns true if real is greater than zero; otherwise, returns false. Regardless of whether an implementation provides distinct representations for positive and negative float zeros, `(minusp -0.0)` always returns false. Examples:
       (minusp -1)  true
       (plusp 0)  false
       (plusp least-positive-single-float)  true
Exceptional Situations: Should signal an error of type type-error if real is not a real. Allegro CL Implementation Details: None.

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