bug#64441: 29.0.92; elisp arithmetic error at ielm prompt

[Van Ly]

> From: Stephen Berman
>
> `/' in Elisp is different from `/' in Common Lisp.
> 
> (elisp) Arithmetic Operations:
> 
>   If all the arguments are integers, the result is an integer,
>   obtained by rounding the quotient towards zero after each division.
> 
> Hence (/ 3 4), (/ 7 13) and (/ 5 12) all evaluate to 0, and "If you
> divide an integer by the integer 0, Emacs signals an ‘arith-error’
> error".
> 
> But in Common Lisp
> (http://www.lispworks.com/documentation/HyperSpec/Body/f_sl.htm):
> 
>   If each argument is either an integer or a ratio, and the result is
>   not an integer, then it is a ratio.
> 
> Hence (/ 3 4) => 3/4,  (/ 7 13) => 7/13 and (/ 5 12) => 5/12
> 

Thank you Steve.