#include <iostream>
using namespace std;
class Base {
public:
    void show1() { cout << "Base public" << endl; }
protected:
    void show2() { cout << "Base protected" << endl; }
private:
    void show3() { cout << "Base private" << endl; }
};
class Derived : public Base {
public:
    void test() {
        // 派生类内测试函数
    }
};
int main() {
    Derived d;
    // 类外测试
    return 0;
}