class

#include <iostream>
using namespace std;

class Drob
{
public:
    int ch, zn;

    Drob(int ch, int zn)
    {
        // constructor
        this->ch = ch;
        this->zn = zn;
    }

    ~Drob()
    {
        // destructor
    }

    const Drob operator+(const Drob &v) const;
    const Drob& operator+=(const Drob &v);
    bool operator==(const Drob &v);

    friend istream& operator>>(istream& stream, Drob &v);
    friend ostream& operator<<(ostream& stream, Drob &v);
};

const Drob Drob::operator+(const Drob &v) const
{
    Drob Sum;
    Sum.ch = this->ch + v.ch;
    Sum.zn = this->zn + v.zn;
    return Sum;
}

const Drob& Drob::operator+=(const Drob &v)
{
    ch += v.ch;
    zn += v.zn;
    return *this;
}

bool Drob::operator==(const Drob &v)
{
    if(this->ch == v.ch && this->zn == v.zn)
        return true;
    return false;
}

istream& operator>>(istream& stream, Drob &v)
{
    stream >> v.ch >> v.zn;
    return stream;
}

ostream& operator<<(ostream& stream, Drob &v)
{
    stream << "ch = " << v.ch << ", zn = " << v.zn;
    return stream;
}

void main()
{
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
    Drob d1, d2;
    cin >> d1 >> d2;
    cout << d1 << endl << d2;
    d1 += d2;
    cout << d1 << endl << d2;
    cout << "\n\n";
    system("pause");
}