zagolovki

//#pragma once нужен ли idndef
#include <iostream>
#include <fstream>

using namespace std;

class InvertionError {};
class DivByZero {};
int gcd(int a, int b);
class Rational
{
    int numer;
    int denom;

public:
    Rational();
    Rational(int number);
    Rational(int n, int d);
    //Rational(double n);
    Rational(const Rational& r);
    Rational invert() const;

    Rational& operator = (const Rational& r);
    int getDenom() const;
    int getNumer() const;

    void simplify();
    //Rational operator+() const;
    Rational operator-() const;

    Rational operator + (const Rational& r) const;
    Rational operator - (const Rational& r) const;
    Rational& operator * (const Rational& r) const;
    Rational operator / (const Rational& r) const;

    Rational& operator += (const Rational& r);
    Rational& operator -= (const Rational& r);
    Rational& operator *= (const Rational& r);
    Rational& operator /= (const Rational& r);

    Rational& operator ++();
    Rational operator ++(int);
    bool operator == (const Rational& r) const;
    bool operator != (const Rational& r) const;
    bool operator < (const Rational & r);
    bool operator <= (const Rational& r);
    bool operator > (const Rational& r);
    bool operator >= (const Rational& r);
    operator int() const;
    operator double() const;

};


istream& operator >> (istream& in, const Rational &r);
ostream& operator << (ostream& out, const Rational &r);