为什么添加空格会使编译器进入无限循环？

Question

Case 3 is an option to add a book to the structure. As long as books with titles without spaces are added, they are ok, whenever I try to put a name that has a space in it, the compiler goes crazy, sorta like what it would do if you execute an infinite loop. Why and what is the solution?

struct bookStruct
{
    string bookTitle;
    int bookPageN;
    int bookReview;
    float bookPrice;
};

const int MAX_BOOKS=10;



case 3:
        {
            for(int i=0;i<MAX_BOOKS;i++)
            {
                if(books[i].bookTitle=="\0")
                {
                cout << "\nPlease Enter the Title: ";
                cin >> books[i].bookTitle ;
                cout << "\nPlease Enter Total Number of Pages: ";
                cin >> books[i].bookPageN ;
                cout << "\nPlease Enter Rating (stars): ";
                cin >> books[i].bookReview ;
                cout << "\nPlease Enter Price: ";
                cin >> books[i].bookPrice;
                cout << "\n\nBook Added.\n\n";
                break;
                }
            }break;

        }

Answer 1

The input operator >> stops at space when reading strings.
What you want to use is std::getline .

cout << "\nPlease Enter the Title: ";
std::getline(std::cin, books[i].bookTitle);

The input operator >> when reading a number will also stop at a space or newline (leaving them on the input stream). Thus when you wrap around to the next book there is still a '\\n' character on the input stream. So for numbers you also need to use std::getline(). But in this case you need to convert the value to an integer.

cout << "\nPlease Enter Total Number of Pages: ";
std::string line;
std::getline(std::cin, line);

std::stringstream linestream(line);
linestream >> books[i].bookPageN ;