1+, 1

1+, 1− Function

Syntax:

1+ number → successor

1*− number → predecessor*

Arguments and Values:

number—a number .

successor, predecessor—a number .

Description:

1+ returns a number that is one more than its argument number. 1- returns a number that is one less than its argument number.

Examples:

(1+ 99) → 100 
(1- 100) → 99 
(1+ (complex 0.0)) → #C(1.0 0.0) 
(1- 5/3) → 2/3 

Exceptional Situations:

Might signal type-error if its argument is not a number . Might signal arithmetic-error.

See Also:

incf, decf

Notes:

(1+ number) ≡ (+ number 1)

(1- number) ≡ (- number 1)

Implementors are encouraged to make the performance of both the previous expressions be the same.

Expanded Reference: /

tip

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(1+ )
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