2.3.1 Integer Type

The range of values for integers in Emacs Lisp is -268435456 to 268435455 (29 bits; i.e., -2**28 à 2**28 - 1) on most machines. (Some machines may provide a wider range.) It is important to note that the Emacs Lisp arithmetic functions do not check for overflow. Thus (1+ 268435455) is -268435456 on most machines.

The read syntax for integers is a sequence of (base ten) digits with an optional sign at the beginning and an optional period at the end. The printed representation produced by the Lisp interpreter never has a leading ‘+’ or a final ‘.’.

-1               ; The integer -1.
1                ; The integer 1.
1.               ; Also the integer 1.
+1               ; Also the integer 1.
536870913        ; Also the integer 1 on a 29-bit implementation.

@xref{Numbers}, for more information.

Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.