#include <iostream>

class Box {
private:
    int width, height, depth;

public:
    Box(int w, int h, int d) : width(w), height(h), depth(d) {}

    // Declaration of friend function
    friend int getBoxVolume(const Box& b);

    // Friend function can be a member of another class
    friend class BoxPrinter;
};

// Definition of friend function
int getBoxVolume(const Box& b) {
    // Can access private members of Box
    return b.width * b.height * b.depth;
}

class BoxPrinter {
public:
    void printBoxDimensions(const Box& b) {
        // Can access private members of Box
        std::cout << "Width: " << b.width 
                  << ", Height: " << b.height 
                  << ", Depth: " << b.depth << std::endl;
    }
};

int main() {
    Box myBox(3, 4, 5);
    std::cout << "Volume: " << getBoxVolume(myBox) << std::endl;

    BoxPrinter printer;
    printer.printBoxDimensions(myBox);

    return 0;
}