*From*: Philipp Kutin <philipp.kutin@xxxxxxxxx>*To*: luajit@xxxxxxxxxxxxx*Date*: Fri, 31 Aug 2012 18:15:43 +0200

On Fri, Aug 31, 2012 at 2:58 PM, Mike Pall <mike-1208@xxxxxxxxxx> wrote: > print(-17 % 3) --> 1 Ick ... > > Actually, LuaJIT has trunc() internally, but it's not exposed as a > library function. It wouldn't help to fix %, anyway. I'm somewhat confused what you're referring to in 'fixing' the '%'. Lua 5.1-ref defines the remainder to be that "of a division that rounds the quotient towards minus infinity", and that's fine, no? > Ok, so an extra div() or divmod() function would be the most > feasible solution (because it can have its own semantics). (...) > > But I'm not sure where I'd place them -- math.* or bit.* are not a > perfect fit for these functions. Adding them to the math module seems reasonable to me, since all the other C-like rounding / float arithmetic functions live there. The only issue I see is potential clashes with future Lua changes, so maybe that should be coordinated with Roberto & maintainers? Also, I'll have to correct myself again: rounding-toward-zero division can be expressed more succinctly with c = (a - math.fmod(a,b))/b since we have remainder-of-divison-rounding-towards-zero. Phew. --Philipp

**References**:**very simple questions about integer division***From:*Francesco Abbate

**Re: very simple questions about integer division***From:*Philipp Kutin

**Re: very simple questions about integer division***From:*Pierpaolo Bernardi

**Re: very simple questions about integer division***From:*Mike Pall

- » very simple questions about integer division- Francesco Abbate
- » Re: very simple questions about integer division- Mike Pall
- » Re: very simple questions about integer division- Philipp Kutin
- » Re: very simple questions about integer division- Philipp Kutin
- » Re: very simple questions about integer division- Francesco Abbate
- » Re: very simple questions about integer division- Pierpaolo Bernardi
- » Re: very simple questions about integer division- Mike Pall
- » Re: very simple questions about integer division - Philipp Kutin
- » Re: very simple questions about integer division- Egor Skriptunoff