1#include <iostream>2using namespace std;3 4unsigned short f(unsigned short x) {5    x ^= x << 6;6    x ^= x >> 8;7    return x;8}9int main() {10    unsigned short x;11    cin >> x;12    unsigned short y = f(x);13    cout << y << endl;14    return 0;15}

假设输入的 $x$ 是不超过 $65535$ 的自然数，完成下面的判断题和单选题: