Reverse Bits (Easy)

Description

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).

Analysis

新添加的一道easy部分的题目。直接位运算。。

My Solution

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//C++
class Solution {
public:
    int reverseBits(int n) {
        int ans = 0;
        for(int i = 0;i<32;i++){
            if(n == 0) {
                ans <<=(32-i);
                break;
            }
            ans = (ans<<1)|(n&1);
            n>>=1;
        }
        return ans;
    }
};