From: Darin McBride 

On June 5, 2004 11:54 am, Bruce D. Wedding wrote:
> > > 4. Multiply x by 7 without using multiplication (*) operator.
> >
> > x = (x << 3) - x;
>
> I like that Roger.  I had done this less clever solution:
>
> x = (x << 2) +( x << 1) +  x;

Less clever, but more correct.  Less likely to overflow the variable
;-)

> I'm working on the "remove dupes from array" problem.  And I
think people
> missed the one about f(7) = 4 and f(4) = 7.  It said show FOUR ways to do
> that.

Ah, yes, did miss that.  :->

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