Multiplication is quick addition.

x + x + x = 3x

and 2 * x + x = 3x

Implemented in a PIC is very fast since it is a shift left (this is the
binary part which doubles the number) and then add the original value.

Dividing by 3 isn't as straight forward as suggested since the "original"
value to subtract isn't known.

Rich

At 08:53 PM 2/26/98 +0100, you wrote:
>>On 23 Feb, 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
>
>>    Simple.  To multiply by 3, double and add to original.  To divide by 3,
>>just do the inverse!
>>-- Mel Evans
>
>Could someone unfold that for a binary math newbie, please?
>/Morgan
>/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
>\  mrt@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /
>
>

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