Re: print(268435456 + 1)

["Leo Razoumov" <slonik.az@...>]

On 9/1/06, Brian Weed <bw@imaginengine.com> wrote:
> Aaron Brown wrote:
> > Brian Weed wrote:
> >
> >> Is there something about adding numbers that I should know
> >> about?
> >
> >> print(0x10000000)
> >> 268435456
> >>
> >> print(0x10000000 + 0x00000001)
> >> 268435456
> >>
> >> print(0x10000000 + 0x00000002)
> >> 268435456
> >
> > I get 268435456, 268435457, and 268435458.  My first guess
> > is that you're using (single-precision) floats instead of
> > doubles.  What platform are you on?  Did you change
> > LUA_NUMBER when compiling?
> >
> > http://docs.sun.com/source/806-3568/ncg_goldberg.html
> >
> This is on Win32 (Lua is part of our game engine).  We did not modify
> LUA_NUMBER.  It's still double.
> Lua is compiled as a static lib via Visual C++ 6.0.  The app is compiled
> via Visual Studio 2005.
> Brian

I do not see any problems on Intel x86 (32bits) Linux 2.6.13 with Lua
5.1.1, double Lua numbers

> print( 268435456 + 1 )
268435457
> print( 268435456 + 2 )
268435458
> print( 268435456 + 3 )
268435459
>

Your problem is clearly platform specific. First compile vanila
standalone Lua-5.1.1 without game engine and try to see whether the
problem persists.
Hope is helps!
--Leo--