Bitwise AND of Numbers Range

public class Solution {
    public int rangeBitwiseAnd(int m, int n) {

        if(m>n){
            return 0;
        }
        int i=0;
        while(m!=n&&m!=0){
            m >>= 1;
            n >>= 1;
            i++;
        }
        return m<<i;
    }
}


http://www.cnblogs.com/grandyang/p/4431646.html