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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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