Divide by 0

#include <iostream>

using namespace std;

int main() {
    int num,den,res;
    cout<<"enter 2 no:"<<endl;
    cin>>num>>den;

    try{
        if(den == 0){
            throw den;
        }
        res = num/den;
    }
    catch(int ex){
        cout<<"0 not allowed"<<endl;
    }
    cout<<"div is:"<<res<<endl;
    return 0;
}