Powers of 2 using & . But how?

Revision en2, by shanto_bangladesh, 2022-06-05 03:51:31

After solving this problem, I looked to some of other's code. In several codes, I found something like this (not exactly this, it's a simplified version of that):

int n = 10;
for(int i = 1; i<=n; i+=i& - i;)
{
cout << i << " ";
}



Output: 1 2 4 8

I also tried for different values of n and the program outputs powers of 2 less than or equal to n.

But how is it working? What's exactly meant by i+=i&-i ?

Thanks for your patience and insight.

#### History

Revisions

Rev. Lang. By When Δ Comment
en2 shanto_bangladesh 2022-06-05 03:51:31 18 (published)
en1 shanto_bangladesh 2022-06-05 03:49:23 580 Initial revision (saved to drafts)