fraction.h

#ifndef _FRACTION_
#define _FRACTION_
#include <iostream>
#include <cstdlib>
using namespace std;
class Fraction
{
private:
    long numerator, denominator;

public:
    Fraction(long n = 0, long d = 1);
    Fraction operator-() const
    {
        return Fraction(-numerator, denominator);
    }
    Fraction &operator+=(const Fraction &a)
    {
        numerator = a.numerator * denominator + numerator * a.denominator;
        denominator *= a.denominator;
        return *this;
    }
    Fraction &operator-=(const Fraction &a)
    {
        *this += (-a);
        return *this;
    }
    Fraction &operator++()
    {
        numerator += denominator;
        return *this;
    }
    Fraction &operator--()
    {
        numerator -= denominator;
        return *this;
    }
    friend Fraction operator+(const Fraction &, const Fraction &);
    friend Fraction operator-(const Fraction &, const Fraction &);
    friend Fraction operator*(const Fraction &, const Fraction &);
    friend Fraction operator/(const Fraction &, const Fraction &);
    friend ostream &operator<<(ostream &os, const Fraction &a);
    friend istream &operator>>(istream &is, Fraction &a);
};
#endif