Leetcode Bitwise AND of numbers range

Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.

For example, given the range [5, 7], you should return 4.

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bitwise AND 的结果是left header， 因为如果某一位出现了0，他右边一位一定会出现0.

public class Solution {
    public int rangeBitwiseAnd(int m, int n) {
        int i=0;
        while(m!=n)
        {
            m>>=1;
            n>>=1;
            i++;
        }
        return m<<i;
    }
}