#include <iostream>
#include <string>
using namespace std;

class ZeroDenominator
{
public:
    ZeroDenominator() {}
    friend ostream& operator<<(ostream& out, const ZeroDenominator& error);
};

class Fraction
{
    int numer, denom;
public:
    Fraction(int n = 0, int d = 1) : numer(n), denom(d)
    {
        cout << "Fraction constructor called\n";
        if (denom == 0) throw ZeroDenominator();
    }
    ~Fraction()
    {
        cout << "Fraction destructor called\n";
    }
    friend ostream& operator<<(ostream& o, const Fraction& f)
    {
        return (o << f.numer << '/' << f.denom);
    }
};

class InputError
{
    string stream;
public:
    InputError(string name) : stream(name) {}
    friend ostream& operator<<(ostream& out, const InputError& error);
};


ostream& operator<<(ostream& out, const InputError& error)
{
    out << "Error in " << error.stream << endl;
    return out;
}


ostream& operator<<(ostream& out, const ZeroDenominator& /*error*/)
{
    out << "ZeroDenominator Error"  << endl;
    return out;
}

int main()
{
    int i1, i2;
    cout << "Enter two ints => ";

    try
    {
        cin >> i1 >> i2;
        if (cin.fail()) throw InputError("cin");
        //	You could also use (!cin) instead of (cin.fail())
        //	cin.bad() did not detect error in cin
        Fraction f(i1,i2);
        cout << f << endl;	// Should this line be in the try block?
    }
    catch (const InputError& error)
    {
        cerr << error << endl;
    }
    catch (const ZeroDenominator& errmsg)
    {
        cerr << errmsg << endl;
    }
    catch (...)
    {
        cerr << "help\n";
    }

    cout << "*** End of Program ***\n";
}