big o - Big O complexity of this loop -


if have 

int i; for(i = 1; < n; *= 2) //n size of array passed function {   //o(1) code here }

what big o complexity? "i *= 2" bit confusing me. tried operation counting i'm more confused.

it looks o(log(n)), because iterate not on whole sequence, use power-of-two steps.


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