Public: void varaqi(double len) {

#include

using namespace std;
class kitob {
public:
void varaqi(double len) {
length_ = len;
}
void muallif(string brnd) {
brand_ = brnd;
}
void nomi(string text) {
cout << brand_ << " " << length_ << " varoqdan iborat " << text << " kitob " << endl;
}
private:
double length_;
string brand_;
};

class kitob;

class daftar {

public:
void color(string clr) {
color_ = clr;
}
void brand(string brnd) {
brand_ = brnd;
}
void write(string text, kitob& qalam) {
cout << brand_ << " " << color_ << " rangdagi daftar " << text << " ..." << endl;
qalam.nomi(text);
}
private:
string color_;
string brand_;
};

int main() {

daftar r;
r.color("qora");
r.brand("parker");

kitob q;
q.varaqi(14.5);

q.muallif("abdulla qodiriy");

r.write(" edi", q);

}