191. Number of 1 Bits

      /*
       * 191. Number of 1 Bits
       * 2016-6-6 by Mingyang
       * 上面那道题目做完以后，下面就稍稍改一下就好啦
       */
      public int hammingWeight(int n) {
          int res = 0;
            for (int i = 0; i < 32; ++i) {
                if ((n&1)==1) {
                    res++;
                }
                n = n >> 1;
            }
            return res;
    }