C++異常処理メカニズム----C++primer 4

#include<iostream>

#include<stdexcept>

#include<exception>

using namespace std;



int main()

{

    int a,b;

    a=-3;

    b=2;

    try

    {

        if((a+b)<0)

            throw runtime_error("have something wrong!!!");

        cout<<a+b<<endl;

    }

    catch(runtime_error err )

    {  

        cout<< err.what();

        cout<<a<<' '<<b<<endl;

    }



    system("pause");

    return 1;

}