Integer multiplication overflow.

[Aahz Maruch]

In article <8ronb6$75e$1 at nnrp1.deja.com>,  <johnvert at my-deja.com> wrote:
>Hello,
>
>I wrote the following simple recursive factorial function in python:
>
>def fact(num):
>  if num < 2: 1
>  return num * fact(num - 1)

Change this to:

def fact(num):
  if num < 2: 1L
  return num * fact(num - 1)

Discovering why is left as an exercise for the reader.

WARNING: this will not work for num>9999.  See recent posts on Fibonacci
sequence for the reason why (if you don't have them on your server, look
at DejaNews).
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