algorithms/cpp/reverseBits/reverseBits.cpp

// Source : https://leetcode.com/problems/reverse-bits/
// Author : Hao Chen
// Date   : 2015-03-30

/********************************************************************************** 
* 
* 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?
* 
* Related problem: Reverse Integer
* 
* Credits:Special thanks to @ts for adding this problem and creating all test cases.
*               
**********************************************************************************/


class Solution {
public:
    uint32_t reverseBits(uint32_t n) {
        uint32_t ret=0;
        for(int i=0; i<32; i++) {
            ret = (ret*2) + (n & 0x1);
            n /=2 ;
        }
        return ret;
    }
};