#include <iostream>
#include <cstdlib>
using namespace std;
#include <setjmp.h>

jmp_buf jumper;	 // declare a jump buffer to save program state

class Fraction
{
    int numer, denom;
public:
    Fraction(int n = 0, int d = 1) : numer(n), denom(d)
    {
        cout << "Fraction " << this << " created" << endl;
        if (d == 0)
            longjmp(jumper,1);	// make sure denom is not 0
    }

    ~Fraction()
    {
       cout << "~Fraction " << this << " destroyed" << endl;
    }

    friend ostream& operator<<(ostream& o, const Fraction& f)
    {
        return (o << f.numer << '/' << f.denom);
    }
};

int main()
{
    int i1, i2;
    int state;
    state = setjmp(jumper);
    if (state != 0)
        cout << "** Go back in time with state  " << state << endl;

    cout << "Enter two ints => ";
    cin >> i1 >> i2;

    Fraction f(i1,i2);
    cout << f << endl;

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