#include <iostream>
using namespace std;

class BaseException {};
class DerivedException : public BaseException {};

int main() {
    try {
        throw DerivedException();
    } catch (BaseException e) {
        cout << "捕获基类异常";
    } catch (DerivedException e) {
        cout << "捕获派生类异常";
    } catch (...) {
        cout << "捕获未知异常";
    }
    return 0;
}