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

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• Subject: Re: problem with string.format %d and very large integers
• From: Lorenzo Donati <lorenzodonatibz@...>
• Date: 2011年7月28日 19:36:09 +0200

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On 28/07/2011 11.27, Florian Weimer wrote:

* Xavier Wang:

2011年7月28日 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

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• References:
  • problem with string.format %d and very large integers, Norman Ramsey
  • Re: problem with string.format %d and very large integers, Florian Weimer
  • Re: problem with string.format %d and very large integers, Xavier Wang
  • Re: problem with string.format %d and very large integers, Florian Weimer

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