[Tutor] factorial

[TJ]

>Maybe I got the syntax wrong on Danny's approximation version, but the way I
>did it it's way off.
>
>Can anyone tell me if I got the syntax wrong or if the function actually
>doesn't work well?

>def apFactorial(n):                #this should be equivalent to Danny's
>     return ((math.sqrt(2 * math.pi)) * (n**(n+1/2)) * (math.exp(-n)))

I played with this a little.  Your syntax looks okay to me except you 
are doing an integer division in this term: (n**(n+1/2))  This is not 
what you want. Change this term to (n**(n+1/2.0)) or even 
(n**(n+0.5)) and you will get better results.

My results were:
Approximate function:	 3598695
Recursive function:	 3628800
Iterative function:	 3628800

TJ