Reverse Bits

 1 class Solution {
 2 public:
 3     uint32_t reverseBits(uint32_t n) {
 4         uint32_t tmp =0;
 5         uint32_t remainder = 0;
 6         int cnt =0;
 7         while(n) {
 8             remainder = n%2;
 9                tmp = tmp*2 +remainder;
10                n /= 2;
11                ++cnt;
12            }
13            cnt = 32 - cnt;
14            while(cnt) {
15                tmp *=2;
16                --cnt;
17            }
18        return tmp;
19     }
20 };