On Jul 13, 1:20 pm, Wayne Brehaut <[EMAIL PROTECTED]> wrote:
> On Mon, 09 Jul 2007 23:51:25 -0700, "[EMAIL PROTECTED]"
>
>
>
>
>
> <[EMAIL PROTECTED]> wrote:
> >On Jul 9, 11:42?pm, Paul McGuire <[EMAIL PROTECTED]> wrote:
> >> On Jul 9, 11:21 pm, "Jim Langston" <[EMAIL PROTECTED]> wrote:> In Python
> >> 2.5 on intel, the statement
> >> > 2**2**2**2**2
> >> > evaluates to>>> 2**2**2**2**2
>
> >> > 200352993040684646497907235156025575044782547556975141926501697371089405955
> >> > 63114
> >> > 530895061308809333481010382343429072631818229493821188126688695063647615470
> >> > 29165
> >> > 041871916351587966347219442930927982084309104855990570159318959639524863372
> >> > 36720
>
> >> <snip>
>
> >> Exponentiation is right associative, so this is the same as:
>
> >> 2**(2**(2**(2**2)))
> >> 2**2**2**4
> >> 2**2**16
> >> 2**65536
>
> >> 2=10**0.3010, so 2**65536 is approx 10**19726
>
> >> There are 19730 digits in your answer,
>
> >>>> import gmpy
> >>>> n = 2**2**2**2**2
> >>>> gmpy.numdigits(n)
> >19729
>
> >Did you count the 'L'?
>
> numdigits(n)?
>>> import gmpy
>>> help(gmpy.numdigits)
Help on built-in function numdigits in module gmpy:
numdigits(...)
numdigits(x[,base]): returns length of string representing x in
the given base (2 to 36, default 10 if omitted or 0); the value
returned may sometimes be 1 more than necessary; no provision
for any 'sign' characte, nor leading '0' or '0x' decoration,
is made in the returned length. x must be an mpz, or else gets
coerced into one.
>
> What? 'L' is a digit in Python?
No, but it's a character. Don't you know the difference
between str() and repr()?
>>> n = 2**2**2**2**2
>>> m = -n
>>> len(str(n))
19729
>>> len(repr(n))
19730
>>> len(str(m))
19730
>>> len(repr(m))
19731
So why would you ever do it the stupid way, when it's
just as easy to get these things right?
>>> gmpy.numdigits(n)
19729
>>> gmpy.numdigits(m)
19729
> I'm going back to Fortran!
Sounds like you never left.
>
> wwwayne
>
> >>so this seems to be at least in
> >> the ball park.
>
> >> -- Paul
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