// 抛出异常
#include <iostream>

using namespace std;

int div(int a, int b)
{
    if (b == 0)
    {
        throw "除数不能为0";
    }
    return a / b;
}

int main()
{
    cout << "-----aaaaa-----" << endl;
    int ret = div(20, 0);
    cout << ret << endl;
    return 0;
}