Hi!
 1-Mar-98 20:15 Rick Dickinson wrote about "Re: divide by 3":

 >> At 03:08 PM 2/23/98 -0000, jhobbs wrote:
 >> >I once knew a fast trick for divide by 3, but now I am unable to reproduce
 >> >it.  If someone can share it with me (and others) that would be great.
 >> >
 >> >Take care -Jim
 >>
 >> I'm not sure how much this will help, but....
 >>
 >> 1/3 = 1/2 - 1/4 + 1/8 - 1/16 + 1/32 - 1/64 + 1/128 .... etc.
    1/3 =(1/2 - 1/4)+(1/8 - 1/16)+(1/32 - 1/64)+ 1/128 .... etc.
    1/3 =       1/4 +       1/16 +        1/64 +       .... etc.
Or in other words
    1/3 = 0.01010101010101010.... (using BINARY notation for result)
Or in another words
    0x100/3=0x55+1
    0x10000/3=0x5555+1
    0x100000000/3=0x55555555+1

Furthermore, it's possible to use the same method to divide by 5:
    1/5=0.0011001100110011...
And so on.

Are these methods (quick and not exact) usefull?
May be. I have a doubt.

--

                                    Vladimir M. Klochko