minusp (ANSI and GNU Common Lisp Document)

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#### 12.2.17 minusp, plusp [Function]

`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.