如何删除已输入的书以及如何使标题，语言和名称在上面放置空格不会出错？

How to delete the book that have been input and how to make the title, language, and name doesn't error if we put space on it?

本文关键字：在上面 语言 出错 空格 标题 删除 何删除 输入 何使      更新时间：2023-10-16

谁能帮我制作一个新菜单来删除所有已输入的书籍？以及如何使标题，名称和语言可以用空格输入？ 我已经搜索了有关它的其他问题，其中许多使用getline。但是我不明白如何在这样的课堂上使用它。

(对不起，我的语法不好，我的英语不是很好(

这是我制作的源代码。

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;
class Book {
int number, year;
string language, name, title;
Book * head, * next;
public:
Book (string & name, string & title, int number, string & language, int year) {
head = NULL;
this -> name = name;
this -> title = title;
this -> language = language;
this -> number = number;
this -> year = year;
};
~ Book (void) {
delete head;
};
void display (void);
void add (void);
void dellete (string&);
};
void Book :: add (void) {
string name, title, language;
int year, number;
cout << endl << "Author:", cin >> name;
cout << "Title:", cin >> title;
cout << "Number of books:", cin >> number;
cout << "Language:", cin >> language;
cout << "Year of publication:", cin >> year;
Book * p = new Book (name, title, number, language, year);
p -> next = head;
head = p;
}
void Book :: display (void) {
Book * p = head;
while (p) {
cout << "----------------------------- n";
cout << "Author:" << p -> name << endl;
cout << "Title:" << p -> title << endl;
cout << "Number of books:" << p -> number << endl;
cout << "Language:" << p -> language << endl;
cout << "Year of publication:" << p -> year << endl;
cout << endl;
p = p -> next;
}
}
int main (int argc, char const ** argv) {
string blank = "";
Book * B = new Book (blank, blank, false, blank, 0);
int opt;
cout << "nBOOK STACKS n";
for (;;) {
cout << "1) Add a book.n";
cout << "2) Show all books.n";
cout << "3) Exit. nn";
cout << "Options:", cin >> opt;
switch (opt) {
            case 1:
                B -> add ();
break;
case 2:
B -> display ();
break;
case 3:
exit (0);
default:
continue;
}
}
return 0;
}

请帮助我获取代码，因为这是我的中期测试任务，我仍然是编程的初学者。谢谢。

如果要每行输入数据，下面是一个示例：

class Book
{
int number;
int year;
std::string language
std::string name;
std::string title;
public:
friend std::istream& operator>>(std::istream& input, Book& b);
//...
};
std::istream& operator>>(std::istream& input, Book& b)
{
std::string text_line;
std::getline(input, text_line);
std::istringstream  text_stream(text_line);
text_stream >> b.number >> b.year >> b.language >> b.name >> b.title;
return input;
}

如果每个数据项都在单独的行上，则可以将operator>>更改为：

std::istream& operator>>(std::istream& input, Book& b)
{
input >> b.number;
input >> b.year;
std::getline(input, b.language);
std::getline(input, b.name);
std::getline(input, b.title);
return input;
}

来自文件的示例输入：

std::vector<Book> library;
Book b;
while (data_file >> b)
{
library.push_back(b);
}
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