Re: Inconsistency: sometimes an integer, sometimes a float

[Nicolas Richard]

Err, sorry for previous message, it was sent by accident.

djc <peter.kaiser@gmail.com> writes:
> "(/ 536870911 1000000)" is an integer.
> "(/ 536870912 1000000)" is a float.

What I was saying is : I can reproduce this from -Q :

/tmp $ emacs -Q --batch  --eval '(message "%s" (type-of (/ 536870912 1000000)))'
float
/tmp $ emacs --version
GNU Emacs 24.3.50.2
(...)

It's because:
$ emacs -Q --batch  --eval '(message "%s" (type-of 536870912))'
float

which itself comes from:
$ emacs -Q --batch  --eval '(message "%s" (> 536870912 most-positive-fixnum))'
t

explanation at:
(info "(elisp) Integer Type")

,----
| 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 (*note Floating Point Type::).  For
| instance, if Emacs integers are 30 bits, `536870912' is read as the
| floating-point number `536870912.0'.
`----

HTH,

-- 
Nico.