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Posted by Oli Filth on 03/17/06 22:16
julian_m said the following on 17/03/2006 20:02:
> I need to calculate the sum of the following numbers
>
> 1+ 11 + 111 + 1111 + ......+ 1111.....11111 (the last one is a number
> made by 2002 1's )
>
> so, I wrote
>
<...SNIP...>
> All works pretty well, and after a really small piece of time, I get:
>
> 1.2345679012346E+308
>
> but the result seems to be wrong
> Can anyone point me where is the mistake?
You can't fully represent a number with 2000-ish significant digits with
normal integers or floats, nor can you represent a number bigger than
~10^308 with floats. So that's two reasons why this doesn't work!
You'll need to use an arbitrary-length integer library, e.g. BCMath.
--
Oli
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