Re: computing 20! all the way
Re: computing 20! all the way
- Subject: Re: computing 20! all the way
- From: Richard Morton <email@hidden>
- Date: Fri, 12 Nov 2004 17:37:12 +1100
On 12 Nov 2004, at 11:29 AM, Martin Orpen wrote:
on 11/11/04 10:56 pm, Brian Johnson wrote:
> My daughter is sitting here with an assignment to calculate 20!
>
> I did the obvious..
> but it's wanted as a whole number (no scientific notation)...
If you/she uses OS X then you use bc when you want to work with *big*
numbers:
set nString to {"1"}
repeat with n from 1 to 20
set end of nString to "*" & n
end repeat
I came across another way of doing this bit some time back. The
original was in C and I just rewrote it as AS:
on factorial from n
if n = 0 then return 1
return n * (factorial from (n - 1))
end factorial
set theResult to do shell script "echo " & (nString as string) & " |
bc"
The above still needs something to turn the result back into an integer
though. NG has posted a vanilla AS method for this. I thought I saw
it on Macscripter too but couldn't find it there just now.
Cheers,
Max Factor
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