Reverse Bits(Easy)

题目: 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).

 public int reverseBits(int n) {
        int answer = 0; // initializing answer
        for (int i = 0; i < 32; i++) { // 32 bit integers
            answer <<= 1; // shifts answer over 1 to open a space
            answer |= ((n >> i) & 1); // inserts bits from n
        }
        return answer;
}