c++ 异常捕获

#include <iostream>
using namespace std;

double fuc(double x, double y)                        //定义函数
{
    if (y == 0)
    {
        throw y;                                    //除数为0，抛出异常
    }
    return x / y;                                   
}

int main()
{
    double res;
    double x, y;
    cin >> x >> y;
    try                                            //定义异常
    { 
        res=fuc(x, y);
        cout << res << endl;
    }
    catch (double)                                    //捕获并处理异常
    {
        cerr << "error of dividing zero.\n";
        //exit(1);                                    //异常退出程序
    }
    system("pause");
    return 0;
}