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

class Day;	// forward declaration

class Number
{
    int n;
public:
    Number(int i) : n(i)
    {
        cout << "Number(int) ctor called\n";
    }
    operator int() const;
    operator Day() const;

};

Number::operator int() const
{
    cout << "* Number::operator int() called\n";
    return n;
}

const string Days[7] =
{
    "Sunday","Monday","Tuesday","Wednesday","Thursday",
    "Friday","Saturday"
};

class Day
{
    string dow;
public:
    Day(int n) : dow(Days[n%7])
    {
        cout << "Day(int) ctor called\n";
    }
    operator Number() const;	// convert Day to Number
    void operator!() const
    {
        cout << "dow = " << dow << endl;
    }
};


Day::operator Number() const
{
    cout << "** Day:: operator Number() called\n";
    for (int i = 0; i < 7; i++)
        if (dow == Days[i]) return Number(i);
    return Number(-1);
}

Number::operator Day() const		   // Why is this function here?
{
    cout << "*** Number::operator Day() called\n";
    return n; //Day(n);
}

void somefunction(Day)
{
    cout << "somefunction called\n";
}


int main()
{
    Number N1(65);

    cout << "N1 = " << N1 << endl;

    Day d1(1);
    !d1;

    //  Day d2(N1);		Why is this an ambiguity?

    Number N2(d1);
    cout << "N2 = " << N2 << endl;
    !Day(Number(d1)+2);

    somefunction(N1);
}