// 限制函数抛出异常
// throw() 声明表示不抛出任何异常
#include <iostream>

using namespace std;

class A
{
public:
    int n;

public:
    A(int n = 0) : n(n) {}
};

// throw() 声明表示不抛出任何异常
void show(int x) throw()
{
    switch (x)
    {
    case 1:
        throw 0;
        break;
    case 2:
        throw 'a';
        break;
    case 3:
        throw "abc";
        break;
    case 4:
        throw 1.25;
        break;
    case 5:
        throw A(100); // 抛出自定义类的对象
        break;
        // default 可以不写，因为前面已经覆盖了所有情况
    }
    cout << "x = " << x << endl;
}

int main()
{
    cout << "输入一个整数: ";
    int x;
    cin >> x;
    try
    {
        show(x);
    }
    catch (const int &error)
    {
        cout << "捕获异常: " << error << endl;
    }
    catch (const char &error)
    {
        cout << "捕获异常: " << error << endl;
    }
    catch (const char *error)
    {
        cout << "捕获异常: " << error << endl;
    }
    catch (const double &error)
    {
        cout << "捕获异常: " << error << endl;
    }
    catch (const A &error)
    {
        cout << "捕获异常: " << error.n << endl;
    }
    return 0;
}