Re: problem with string.format %d and very large integers

[Lorenzo Donati <lorenzodonatibz@...>]

On 28/07/2011 11.27, Florian Weimer wrote:
> * Xavier Wang:
>
> > 2011/7/28 Florian Weimer<fw@deneb.enyo.de>:
> > > * Norman Ramsey:
> > >
> > > > The first law holds, but if n is sufficiently large, the second does not:
> > > >
> > > >      : nr@labrador 12309 ; lua
> > > >      Lua 5.1.4  Copyright (C) 1994-2008 Lua.org, PUC-Rio
> > >
> > > Whay kind of architecture do you use?  It works for me as expcted with
> > > Lua 5.1.4 on Debian squeeze amd64.
>
> > Obviously he is on a 32x machine :)  -2147483648 == -2^32
>
> Not so obvious.  %d expects an int argument, which is 32 bit on amd64,
> too.  Perhaps the C varargs calling convention is fixing things up on
> amd64, but I'm not sure.
It doesn't work for me:

-- Lua 5.1.4 on Windows XP (SP2)
-- CPU: Intel Mobile Core 2 Duo T7500
x = 2^31
print( ("%.0f     %d"):format(x,x) )
--> 2147483648     -2147483648



-- Lorenzo