Leetcode 190. Reverse Bits（反转比特数）

Reverse bits of a given 32 bits unsigned integer.

For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as 00111001011110000010100101000000).

Follow up: If this function is called many times, how would you optimize it?

 class Solution {
 public:
     uint32_t reverseBits(uint32_t n) {
         uint32_t k = , num = ;
         while(num <= ){
             if(k == )
                 k = n & ;
             else
                 k = (k << ) | (n & );
             n >>= ;
             num++;
         }
         return k;

     }
 };