for a number N
first set bit(From Left) is simply integer value of log(N)
last set bit can be calculated as

N = N-(N&(N-1)); and then Log(N)

int i = log(n);
n -= n&(n-1);
int j = log(n);

i-j will be the answer.


On Sat, Jul 2, 2011 at 2:34 PM, cegprakash <cegprak...@gmail.com> wrote:

> oh fine.. got it now.. set bit is '1' right.. and is there any short
> ways to find the difference between first set and short set bit
> without dividing by 2 repeatedly?
>
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-- 
Sunny Aggrawal
B-Tech IV year,CSI
Indian Institute Of Technology,Roorkee

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