else if (choice == "3")

{

int num;

string option;

string add = "y";

cout << endl;

string choiceAuthor = "y";

while (choiceAuthor == "y") {

cout << "\t\tWould you like to:" << endl;

cout << "\t\t1- Change current Authors" << endl;

cout << "\t\t2- Add an Author" << endl;

cout<<endl;

cout << "\t\tSelect your choice <1-2>" << endl;

cout << "\t\tChoice: ";

getline(cin, option);

if (option == "1")//change current Authors name {

for (int j = 0; j < libDB[i].authors.size(); j++)

{

cout<<endl;

cout<<"\t\t-------------------------------------------"<<endl;

cout << "\t\t\t Author " << j + 1 << endl;

cout<<"\t\t-------------------------------------------"<<endl;

cout << "\t\tFirst name : " << libDB[i].authors[j].fname << endl;

cout << "\t\tLast name : " << libDB[i].authors[j].lname << endl;

}

cout << endl;

cout << "\t\tWhich Author's name would you like to change?" << endl;

cout << "\t\tChoice: ";

cout<<endl;

cin >> num;//the user will select

while (num <= 0 || num > libDB[i].authors.size())//must be greater than 0 and less or equal to

{//this is if the user select the invalid number

cin.clear();

cin.ignore(100, ' ');

cout << "\t\tInvalid Choice" << endl;

cout << "\t\tPlease try a valid number: ";

cin >> num;

}

cin.ignore(100, ' ');

cout << "\t\tFirst name: ";

getline(cin, libDB[i].authors[num - 1].fname);

cout << "\t\tLast name : ";

getline(cin, libDB[i].authors[num - 1].lname);

choiceAuthor = "n";

cout<<endl << "\t\t\t**Modified successfully**" << endl;

}

else if (option == "2")// this option is for adding another Authors name

{

while (add == "y" || add == "Y")

{

cout<<endl;

cout << "\t\tAuthor's First name: ";

getline(cin, temp_n.fname);

cout << "\t\tAuthors's Last name: ";

getline(cin, temp_n.lname);

libDB[i].authors.push_back(temp_n);

cout << endl;

cout << "\t\tWould you like to add another Author's name?" << endl;

cout << "\t\t\tPress (y) for yes " <<endl;

cout << "\t\t\tPress (n) for no " <<endl;

cout << "\t\t\tChoice: ";

getline(cin, add);

}

choiceAuthor = "n";

cout << "\t\t\t**Modified successfully**" << endl;

}

else

{

cout << "\t\tInvalid Choice" << endl;

cout << "\t\tPlease enter a valid input" << endl;

}

}

}

what is (choiceAuthor = "n";)

what does it mean and why is it put there amd can you explain the code line by line too please thank you so much