LeetCode 190. Reverse Bits

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 ans = 0;
        for(int i = 0; i < 32; i++) {
            ans = ans * 2 + n % 2;
            n = n / 2;
        }
        return ans;
    }
};

class Solution {

public:

uint32_t reverseBits(uint32_t n) {

uint32_t ans = 0;

for(int i = 0; i < 32; i++) {

ans = ans * 2 + n % 2;

n = n / 2;

}

return ans;

}

};

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