minusp, plusp

ToC

Allegro CL

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.