#include <iostream>

using namespace std;

ostream operator<<(ostream& o, const Operand& obj)
{
    o << obj.numar;
}

class Operand
{
public:
    Operand() { numar = 0; }
    Operand(int n) :numar(n){}
    friend Calculator;
    Operand operator+(Operand& obj)
    {
        return Operand(numar + obj.numar);
    }
    Operand operator/(Operand& obj)
    {
        return Operand(numar / obj.numar);
    }
    friend ostream operator<<(ostream& o, const Operand& obj);
private:
    int numar;
};

class UC
{
public:
    UC() { nr1 = 0; nr2 = 0; operatie = ""; }
    UC(int n1, int n2, string op): nr1(n1), nr2(n2), operatie(op){}
protected:
    int nr1;
    int nr2;
    string operatie;
};

class ALU:public UC
{
public:
    ALU()
    {
        operatie = UC::operatie;
    }
    Operand calcul()
    {
        if (operatie == "+")
            return (nr1 + nr2);
        else
            if (operatie == "/")
                return (nr1 / nr2);
            else
                cout << "Operatie incorecta";
    }
private:
    string operatie;
};

class UM:public UC, public ALU
{
public:
    friend ALU;
    UM()
    {
        op1 = UC::nr1;
        op2 = UC::nr2;
        rezultat = 0;
    }
    void stocareDate()
    {
        rezultat = calcul();
    }
protected:
    Operand op1;
    Operand op2;
    Operand rezultat;
};

class UA: public UM
{
public:
    void Afisare()
    {
        cout << op1 << "+" << op2 << "=" << rezultat;
    }
};

class Calculator
{
public:
    Calculator(UC _uc, ALU _alu, UM _um, UA _ua): uc(_uc), alu(_alu), um(_um), ua(_ua){}
    void executare()
    {
        ua.Afisare();
    }
private:
    UC uc;
    ALU alu;
    UM um;
    UA ua;
};