// 24_10_18.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include "pch.h"
#include <iostream>
#include <cassert>

using namespace std;

class Fraction {
	int m_num, n_dem;

public:
	Fraction(int n = 0, int m = 1) :m_num(n), n_dem(m)
	{
		reduce(); //odrazu skraca przy uruchomieniu
	}


	friend Fraction operator+(const Fraction &f1, const Fraction &f2) 
	{
		return Fraction(f1.m_num*f2.n_dem + (f2.m_num*f1.n_dem), f1.n_dem*f2.n_dem);
	}

	friend Fraction operator-(const Fraction &f1, const Fraction &f2)
	{
		return Fraction(f1.m_num*f2.n_dem - (f2.m_num*f1.n_dem), f1.n_dem*f2.n_dem);
	}
	friend Fraction operator*(const Fraction &f1, const Fraction &f2)
	{
		return Fraction(f1.m_num*f2.m_num, f1.n_dem*f2.n_dem);
	}
	friend Fraction operator/(const Fraction &f1, const Fraction &f2)
	{
		return Fraction(f1.m_num*f2.n_dem, f1.n_dem*f2.m_num);
	}

	friend ostream& operator<<(ostream& out, const Fraction& f)
	{
		out << f.m_num << "/" << f.n_dem;
		return out;
	}

	friend istream& operator>>(istream& in, Fraction& f)
	{
		char a;
		in >> f.m_num;
		in >> a;
		in >> f.n_dem; 
		assert(f.n_dem > 0);
		assert(a == '/');
		return in;
	}

	operator double() {

		return ((double)m_num / (double)n_dem);
	}

	Fraction& operator++() { //inkrementacja
		m_num += n_dem; // zwraca a/b + 1 = (a+b)/b;
		return *this;
	}

	Fraction& reduce()
	{
		int min_value = abs(m_num) < abs(n_dem) ? abs(m_num) : abs(n_dem);
		int divisor = 2;
		while (divisor <= min_value)
		{
			if (abs(m_num) % divisor == 0 && (abs(n_dem) % divisor) == 0)
			{
				m_num /= divisor;
				n_dem /= divisor;
				min_value /= divisor;
				divisor = 2;
			}
			else
			{
				divisor++;
			}
		}
		return *this;   //to oznacza biezacy obiekt
	}
	
};
int main()
{
	Fraction f1;
	Fraction f2;
	cout << "Enter fraction1:" << endl;
	cin >> f1;
	cout << "Enter fraction2:" << endl;
	cin >> f2;
	cout << "f1+f2=" << f1 + f2 << endl;
	cout << "f1*f2=" << f1 * f2 << endl;
	cout << "f1 as double=" << (double)f1 << endl;
	cout << "++f1=" << ++f1 << endl;

	return 0;
}