Reverse bits of a given 32 bits unsigned integer.

For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as00111001011110000010100101000000).

注意应该做到平台无关性，需要做到这样的话应该声明一个uint32量然后一直向左移，知道得到 0 就可以得到uint32的位数大小 ：

1 class Solution { 2 public: 3     uint32_t reverseBits(uint32_t n) { 4         uint32_t result = 0; 5         for(uint32_t i = 1; i != 0; i <<= 1){ 6             result <<= 1; 7             result |= (n & 1); 8             n >>= 1; 9         }10         return result;11     }12 };