How does one access value of variables from one class in another class using friendship?

[rojan1918]

I want to be able to use the value of the x and y variable I type in from the Regner class in the extra class. I so far have the following but it's not working

  #include <iostream>
using namespace std;

class extra;
class Regner {
	friend class extra;
public:

    void getInput();
    void calculate();

private:
    double x;
    double y;
};

class extra{
public:
	void bruger(){
		Regner one;
		z=one.x;
		w=one.y;
	}
	void udfrabruger(){
		cout<<"z/w = "<<z/w<<endl;
	}

private:
	int z,w;
};

int main()
{

    Regner find;          // construct a default object
    extra find2;
    find.getInput();      // ask for user input
    find.calculate();     // use it
    find2.bruger();
    find2.udfrabruger();
}


void Regner::getInput()
    {
        cout << "Enter x: ";
        cin >> x;
        cout << "Enter y: ";
        cin >> y;
    }
void Regner::calculate()
    {
        cout << "x + y = " << x + y << endl;
        cout << "x - y = " << x - y << endl;
        cout << "x * y = " << x * y << endl;
    }

[Moschops]

		Regner one;
		z=one.x;
		w=one.y;

What's the value of z after this? What's the value of w after this? (Trick question; you don't know because they haven't been set)

[rojan1918]

So what would I have to do? I want z to have the value of x and w to have the value of y which I get form the other class