我正在编写一个程序来跟踪您已读过、想读或未读完的书籍。当我第一次运行该程序时，我添加一本新书，然后查看列表，然后尝试再次添加一本新书，但它卡住了，询问同样的事情（您想：a：添加新书，b：查看列表吗？ , :exit) 无论我多少次输入“a”。如果我之前已经查看过列表一次，那么当我尝试查看列表时，也会发生同样的情况。我已经研究了几个小时，很抱歉，如果这是显而易见的，但我做错了什么，我应该改变什么？这是我到目前为止所拥有的：
string AddNewBook() {
string title;
string author;
string titleandauthor;
cout << "\nWhat is the title of the book?\n " ;
getline(cin, title);
cout << "\nWho is the author?\n " ;
getline(cin, author);
titleandauthor = title + " by " + author;
return titleandauthor;
}
int main() {
string q1;
string title;
string author;
string q2;
string book;
string addbookq = "y";
vector<string> booksread;
vector<string> tbr;
vector<string> dnf;
string seelistq;
int readnument;
int tbrnument;
int dnfnument;
int i;
string seeanotherlistq = "y";
cout << "Welcome to the Book Tracker!\n" << endl;
cout << "Would you like to:\n A: Add a new book\n B: View a list\n C: Exit" << endl;
cout << "Enter letter: " ;
cin >> q1;
cin.ignore();
while (q1 == "a" or q1 == "A" or q1 == "b" or q1 == "B") {
if (q1 == "A" or q1 == "a") {
while (addbookq == "Y" or addbookq == "y" or addbookq == "Yes" or addbookq == "yes") {
book = AddNewBook();
cout << "\nWould you like to:\n A: Add this book to the Read list\n B: Add this book to the To Be Read list\n C: Add this book to the Did Not Finish list" << endl;
cout << "Enter letter: " ;
getline(cin, q2);
while (q2 != "A" && q2 != "a" && q2 != "B" && q2 != "b" && q2 != "C" && q2 != "c") {
cout << "\nInvalid entry, please try again: " ;
getline(cin, q2);
}
if (q2 == "A" or q2 == "a") {
booksread.push_back(book);
cout << "Added to Read list." << endl;
}
else if (q2 == "B" or q2 == "b") {
tbr.push_back(book);
cout << "Added to the To Be Read List." << endl;
}
else if (q2 == "C" or q2 == "c") {
dnf.push_back(book);
cout << "Added to the Did Not Finish List." << endl;
}
cout << "\nAdd another book? " ;
getline(cin, addbookq);
}
}
else if (q1 == "B" or q1 == "b") {
while (seeanotherlistq == "Y" or seeanotherlistq == "y" or seeanotherlistq == "Yes" or seeanotherlistq == "yes") {
cout << "\nWhich list would you like to see:\n A: Read list\n B: To Be Read list\n C: Did Not Finish list" << endl;
cout << "Enter letter: " ;
getline(cin, seelistq);
if (seelistq == "a" or seelistq == "A") {
if (booksread.size() == 0) {
cout << "\nThere are no books in the Read List yet." << endl;
}
else if (booksread.size() == 1) {
cout << "\nThere is 1 book in the Read list: " << booksread.at(0) << endl;
}
else {
cout << "\nThere are " << booksread.size() << " books in the Read list. How many titles would you to see?" << endl;
cin >> readnument;
cout << endl;
for (i = 0; i < readnument; i++) {
cout << i + 1 << ". " << booksread.at(i) << endl;
}
}
}
else if (seelistq == "b" or seelistq == "B") {
if (tbr.size() == 0) {
cout << "\nThere are no books in the To Be Read list yet." << endl;
}
else if (tbr.size() == 1) {
cout << "\nThere is 1 book in the To Be Read list: " << tbr.at(0) << endl;
}
else {
cout << "\nThere are " << tbr.size() << " books in the To Be Read list. How many titles would you like to see?" << endl;
cin >> tbrnument;
cout << endl;
for (i = 0; i < tbrnument; i++) {
cout << i + 1 << ". " << tbr.at(i) << endl;
}
}
}
else if (seelistq == "c" or seelistq == "C") {
if (dnf.size() == 0) {
cout << "\nThere are no books in the To Be Read list yet." << endl;
}
else {
cout << "\nThere are " << dnf.size() << " books in the Did Not Finish list. How many titles would you like to see?" << endl;
cin >> dnfnument;
for (i = 0; i < dnfnument; i++) {
cout << i + 1 << ". " << dnf.at(i) << endl;
}
}
}
cout << endl;
cout << "See another list? " ;
getline(cin, seeanotherlistq);
}
}
cout << "\nWould you like to:\n A: Add a new book\n B: View a list\n C: Exit" << endl;
cout << "Enter letter: " ;
cin >> q1;
cin.ignore();
}
cout << "\nThank you for using the Book Tracker!" << endl;
return 0;
}
这是一个示例输出：
Welcome to the Book Tracker!
Would you like to:
A: Add a new book
B: View a list
C: Exit
Enter letter: a
What is the title of the book?
dark disciple
Who is the author?
christie golden
Would you like to:
A: Add this book to the Read list
B: Add this book to the To Be Read list
C: Add this book to the Did Not Finish list
Enter letter: b
Added to the To Be Read List.
Add another book? n
Would you like to:
A: Add a new book
B: View a list
C: Exit
Enter letter: b
Which list would you like to see:
A: Read list
B: To Be Read list
C: Did Not Finish list
Enter letter: b
There is 1 book in the To Be Read list: dark disciple by christie golden
See another list? n
Would you like to:
A: Add a new book
B: View a list
C: Exit
Enter letter: a
Would you like to:
A: Add a new book
B: View a list
C: Exit
Enter letter: b
Would you like to:
A: Add a new book
B: View a list
C: Exit
Enter letter: c
Thank you for using the Book Tracker!
在主循环中选择
ABwhileaddbookqseeanotherlistq因此，要么重置变量，要么使用
do..while