leet-code/461/solution.c

int countOnesBits(int x) {
    int result = 0;
    
    while (x > 0) {
        if (x % 2 == 1) {
            result++;
        }
        
        x = x >> 1;
    }
    
    return result;
}

int hammingDistance(int x, int y) {
    return countOnesBits(x ^ y);
}