friend function

[dragu_stelian]

I have the following code.

#include <iostream>
using namespace std;

class FirstClass
{
private:
    int x;
public:
    FirstClass()
    {
        cout << "\n Apel constructor implicit(FirstClass)" << endl;
    }
    FirstClass(int x)
    {
        cout << "\n Apel constructor cu parametri(FirstClass)" << endl;
        this->x = x;
        cout << "\n x = " << x << endl;
    }
    void setX(int x)
    {
        this->x = x;
    }
    int getX()
    {
        return x;
    }
};

class SecondClass
{
private:
    int z;
    FirstClass box1;
public:
    // friend FirstClass getBox1();
    SecondClass()
    {
        cout << "\n Apel constructor implicit(SecondClass)" << endl;
    }
    SecondClass(int z)
    {
        cout << "\n Apel constructor cu parametri(SecondClass)" << endl;
        this->z = z;
        cout << "\n z = " << z << endl;
    }
    void setBox1(int x)
    {
        box1.setX(x);
    }
    FirstClass getBox1()
    {
        return box1;
    }
};

int main()
{
    SecondClass obj3(300);

    obj3.setBox1(500);
    cout << "\n x = " << obj3.getBox1().getX() << endl;

    return 0;
}

I want to print x using friend function using next declaration:

friend FirstClass getBox1(SecondClass &op)
{
    return op.box1;
}

but it's not running.

question: Can I use friend function in this code or maybe friend class ?
If answer is yes, how ?

[laserlight]

SecondClass already has a function named getBox1 that returns a FirstClass object, so you don't need the non-member version of getBox1 to be a friend function. Actually, you don't need at the non-member version at all, but if you insist:

FirstClass getBox1(SecondClass &op)
{
    return op.getBox1();
}

That said, these functions are not const-correct. The member version should have been:

FirstClass getBox1() const
{
    return box1;
}

The non-member version:

FirstClass getBox1(const SecondClass &op)
{
    return op.getBox1();
}

[daylight18]

cplusplus beginners lab assignments may help about that