# Dealing with large numbers

Mark Smith lists at futilism.com
Wed Sep 17 13:16:31 CDT 2008

```Mark, I just ran this, (mac 10.4.11, rev 3.0) and see no problems,
even up to 1000 iterations - could it be some platform-related thing?

Best,

Mark

ps. the 1000th iteration was
434665576869374275069961555511137369890149306067531359404218934455749241
032917045565907240316294571302242425620098031386057959852750558837247446
45670017852944230821885448147900618234216285807506383791353495552
On 17 Sep 2008, at 18:53, Mark Wieder wrote:

> All-
>
> I just ran into an integer overflow problem and I'm wondering if there
> is a preferred way of dealing with this. I get the right number of
> digits, but after iteration 79 the last digits are all zero. Is there
> a way of dealing with large numbers? Here's a simple handler that
> gives wrong answers:
>
> --------------------------------------------------
> -- Find the Nth Fibonacci number
> -- Usage: Fibonacci(100)
> -- note: this overflows at around iteration 79
> --------------------------------------------------
> on Fibonacci pIteration
>     local tFibNum
>     local tPrevious
>     local tTemp
>
>     -- prime the pump
>     put 1 into tPrevious -- Fibonacci number 1
>     put 1 into tFibNum -- Fibonacci number 2
>     repeat with x=3 to pIteration
>         put tFibNum into tTemp
>         add tPrevious to tFibNum
>         put tTemp into tPrevious
>         -- show your work
>         put "Iteration" && x & "=" && tFibNum & cr after field 1
>     end repeat
> end Fibonacci
>
> --
> -Mark Wieder
>  mwieder at ahsoftware.net
>
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```