请修改倒数第3行为： catch(A &){，且修改后结果不为catched in main，#include <iostream> #include <exception> using namespace std; class A { }; int func1(int m, int n) {try { if (n == 0) throw A(); cout << "in func1" << endl; return m / n; } catch (exception) {cout << "catched in func1" << endl; } cout << "before end of func1"<< endl; return m / n; } int main() {try {func1(5, 0); cout << "in main" << endl; } catch (A &a) {cout << "catched in main" << endl; } cout << "end of main" << endl; return 0; }

修改后的代码如下：

#include <iostream>
#include <exception>
using namespace std;

class A {};

int func1(int m, int n)
{
    try {
        if (n == 0)
            throw A();
        cout << "in func1" << endl;
        return m / n;
    } catch (exception) {
        cout << "catched in func1" << endl;
    }
    cout << "before end of func1"<< endl;
    return m / n;
}

int main()
{
    try {
        func1(5, 0);
        cout << "in main" << endl;
    } catch (A &) {
        cout << "catched in main" << endl;
    }
    cout << "end of main" << endl;
    return 0;
}

修改后的代码中，将异常处理部分的 `catch (exception)` 修改为 `catch (A &)`, 这样就能捕获到 `throw A()` 抛出的异常，并输出 `catched in main`。