Looping problem in c++

It seems that the after displaying the book name, it can't go up to the for loop until I press "Enter" button. Any idea ?

Thx

for (int k = 0; k < noOfBook; k++) {
                ibook = createBook();
                cout << ibook.getName() << endl;
            }

#include<iostream>
#include<vector>
#include <stdio.h>
#include <string>
using namespace std;


class Book {
private:
    char name[50];
    int pub_year;
    int book_count;
    char subject[50];

public:
    //constructor
    Book() {};

    Book(char iname[50], int y, int count, char sub[50]) {
        strcpy_s(name, iname);
        pub_year = y;
        book_count = count;
        strcpy_s(subject, sub);
    };

    //getter
    char* getName() {
        return name;
    }
    int getYear() {
        return pub_year;
    }
    int getBookcount() {
        return book_count;
    }
    char* getSubject() {
        return subject;
    }
    //setter

};

class Subject {
private:
   char name[50];
   int book_count;
   Book blist[100];

public:
   //constructor
   Subject() {};

   Subject(char iname[50]) {
        strcpy_s(name, iname);
        book_count = 0;
   };
   //getter
   char* getName() {
      return name;
   }

    //Method
   void printListedDetail() {
      //printf("%d %d %.2f \n", month, day, balance);
      //cout << name << " " << pub_year << " " << book_count << " " << subject << endl;
   }
};


std::string first_numberstring(std::string const& str)
{
    char const* digits = "0123456789";
    std::size_t const n = str.find_first_of(digits);
    if (n != std::string::npos)
    {
        std::size_t const m = str.find_first_not_of(digits, n);
        return str.substr(n, m != std::string::npos ? m - n : m);
    }
    return std::string();
}


Book createBook() {
    char str[50];
    char book[50];
    char year[50];
    char number[50];
    char subject[50];
    char out[50];

    cin.ignore(numeric_limits<streamsize>::max(), '\n');
    cout << "Input the information of books (name, pub_year, number, subject):";
    cin.getline(str,50);
    cin.clear();

    int i = 0;

    //Book
    do {
        book[i] = str[i];
        i++;
    } while (str[i] != ' ');
    book[i] = '\0';
    
    //Year
    i++;
    do {
        year[i] = str[i];
        i++;
    } while (isdigit(str[i]) && str[i] != ' ');
    year[i] = '\0';
    int iYear = stoi(first_numberstring(year));

    //number
    i++;
    do {
        number[i] = str[i];
        i++;
    } while (isdigit(str[i]) && str[i] != ' ');

    number[i] = '\0';
    int inumber = stoi(first_numberstring(number));

    //subject
    i++;
    do {
        subject[i] = str[i];
        i++;
    } while (str[i] != '\0');
    subject[i] = '\0';

    Book ibook = Book(book, iYear, inumber, subject);

    return ibook;
}

int main()
{
    Subject library[50];
    int totSubject = -1;
    
    int noOfBook;
    Book ibook;
 
     char choice = 'a';

    while (true)
    {
        cout << "welcome to the Library, what do you want to do ? " << endl;
        cin >> choice;

        switch (toupper(choice))
        {
        case 'S':
            cout << "Input the number of books :";
            cin >> noOfBook;
            
            for (int k = 0; k < noOfBook; k++) {
                ibook = createBook();
                cout << ibook.getName() << endl;
            }
            break;

        case 'L':

            break;

        case 'B':
            break;

        case 'Q':
            exit(0);

        default:
            cout << "Invalid Input " << endl;
            break;
        }
    }
    return 0;
}

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