2220. Minimum Bit Flips to Convert Number

class Solution {
    public int minBitFlips(int start, int goal) {
        int count = 0;
        while (start > 0 || goal > 0) {

            count += (start & 1) ^ (goal & 1);
            start >>= 1;
            goal >>= 1;
        }
        return count;
    }
}

/**
16 8421
111
   1010

 */