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Thank you.
How about producing a empty string? 

string.format("Number is %d",data) ==> Number is

----- Original Message ----- 
From: "Andreas Stenius" <>
To: "Lua list" <>
Sent: Thursday, August 24, 2006 4:09 PM
Subject: Re: string.format a nil value

> jason zhang skrev:
> [snip]
>> string.format("%d",novalue), where novalue is a nil variant.
>> Why not outputing a "NIL" like string? It think it's not very friendly 
>> to print a error information and
>> exit.
> Because code that uses the output may rely on the facy that it should be
> a valid number, since %d was used. If you want "nil" to come out of it,
> i would recommend trying:
> string.format("%s", tostring(novalue))
> Which will work as expected for numbers as well (altough you'll get the
> fraction part as well, which isn't what you'd get with %d)..
> Cheers,
> Andreas