On 4/20/06, Peter Todd <pete@petertodd.ca> wrote:
>
> On Thu, Apr 20, 2006 at 02:54:52PM +0200, YAP wrote:
> > What is 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF (128 bits) in decimal?  How
> go a
> > head an calculate big numbers like this.
>
> If you have Linux, the bc calculator is great for this sort of thing:
>
> pete@gw:~$ bc
> bc 1.06
> Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
> This is free software with ABSOLUTELY NO WARRANTY.
> For details type `warranty'.
> ibase=16
> FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
> 340282366920938463463374607431768211455
> quit
> pete@gw:~$
>
> It can work with arbitrarily large numbers, computing crazy stuff like
> 2^(2^16) works.
>
> I use it damn near constantly for low-level programming for stuff like
> this:
>
> pete@gw:~/d/meta/uuid$ bc
> bc 1.06
> Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
> This is free software with ABSOLUTELY NO WARRANTY.
> For details type `warranty'.
> obase=16
> ibase=2
> 1011001000010111011111111110110111111001110010001001111110010110
> B2177FEDF9C89F96
> quit
> pete@gw:~/d/meta/uuid$
>
> The arbitrary bases feature is almost great... Except in the above
> example the obase=16 *has* to be above the ibase=2 See, if I use
> ibase=2 first, my obase command is interpreted with it's argument... in
> binary.
>
> --
> pete@petertodd.ca http://www.petertodd.ca
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Thanks Peter,

*very* valuable.

Cheers
/Ake
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