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The range of values for integers in Emacs Lisp is −268435456 to
268435455 (29 bits; i.e.,
-2**28
to
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.
See Numbers, for more information.