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

// Note: Implement parts (a), (b) & (c) as per the requirements of QUESTION_1.
class Mass
{
private:
	int m_Tonne;
	int m_Kilo;
	int m_Gram;
public:
	Mass(double inMass = 0.0){
		m_Tonne = inMass;
		m_Kilo = (inMass - m_Tonne) * 1000;
		m_Gram = ((inMass - m_Tonne) * 1000 - m_Kilo) * 1000;
	}
	Mass operator-(const Mass &a){
		Mass temp;
		
		temp.m_Gram = m_Gram - a.m_Gram;
		temp.m_Kilo = m_Kilo - a.m_Kilo;
		temp.m_Tonne = m_Tonne - a.m_Tonne; 

		if(temp.m_Tonne > 0){
			if(temp.m_Gram < 0){
				temp.m_Gram += 1000;
				temp.m_Kilo--;
			}
			if(temp.m_Kilo < 0){
				temp.m_Kilo += 1000;
				temp.m_Tonne--;
			}
		}
		if(temp.m_Tonne < 0){
			if(temp.m_Gram > 0){
				temp.m_Gram = abs(temp.m_Gram -= 1000);
				temp.m_Kilo++;
			}
			if(temp.m_Kilo > 0){
				temp.m_Kilo = abs(temp.m_Kilo -= 1000);
				temp.m_Tonne++;
			}
		}

		return temp;
	}
	 friend ostream &operator<<(ostream &out, const Mass &a){
		out << a.m_Tonne << " t, " << a.m_Kilo << " kg and " << a.m_Gram << " g";
		return out;
	}
};

// Driver program (will not compile until you complete parts (a), (b) & (c) of QUESTION 1.
// DO NOT Modify the main() function.
int main()
{
	Mass massOne(6.2004);
	Mass massTwo(4.3659);
	Mass subMass1, subMass2;

	subMass1 = massOne - massTwo;
	subMass2 = massTwo - massOne;

	cout << "Mass 1 = " << massOne << endl;
	cout << "Mass 2 = " << massTwo << endl;
	cout << "Mass 1 - Mass 2 = " << subMass1 << endl;
	cout << "Mass 2 - Mass 1 = " << subMass2 << endl;

	return 0;
}