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ANSI Common Lisp  12 Numbers 12.2 Dictionary of Numbers
- 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.
- Allegro CL Implementation Details:
-
None.
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