Info Catalog elisp: Programming Types elisp: Floating-Point Type

elisp: Integer Type

 
 2.3.1 Integer Type
 ------------------
 
 The range of values for an integer depends on the machine.  The minimum
 range is −536,870,912 to 536,870,911 (30 bits; i.e., −2**29 to 2**29 −
 1) but many machines provide a wider range.  Emacs Lisp arithmetic
 functions do not check for integer overflow.  Thus ‘(1+ 536870911)’ is
 −536,870,912 if Emacs integers are 30 bits.
 
    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.
 
 As a special exception, if a sequence of digits specifies an integer too
 large or too small to be a valid integer object, the Lisp reader reads
 it as a floating-point number (Floating-Point Type).  For
 instance, if Emacs integers are 30 bits, ‘536870912’ is read as the
 floating-point number ‘536870912.0’.
 
    Numbers, for more information.
 

Info Catalog elisp: Programming Types elisp: Floating-Point Type