我知道之前曾有人问过这个问题,但请谦卑。我很难掌握如何初始化类。

这是有问题的代码。

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

//-------------------------------------------------------------------   ---------------------------

class Date                                                                  //Class Date
{
public:
    int day;
    int month;
    int year;
    Date();
    Date(int,int,int);
    ~Date(void);
};

Date::Date(void)
{
    day = 0;
    month = 0;
    year = 0;
}

Date::Date(int month, int day, int year)
{
    day = day;
    month = month;
    year = year;
}                                                                         //Class Date

//---------------------------------------------------------------------------------------------
                                                                    //Class Book
class Book
{
public:
    string _title;
    string _author;
    Date _published;
    string _publisher;
    float _price;
    string _isbn;
    int _page;
    int _copies;
    Book();
    Book(string,string,Date,string,float,string,int,int);
    ~Book(void);
};

Book::Book(void)
{
    _title = "";
    _author = "";
    //_published;
    _publisher = "";
    _price = 0;
    _isbn = "";
    _page = 0;
    _copies = 0;

}

Book::Book(string title, string author, Date published, string publisher, float price, string isbn, int page, int copies)
{
    _title = title;
    _author = author;
    _published = published;
    _publisher = publisher;
    _price = price;
    _isbn = isbn;
    _page = page;
    _copies = copies;
}                                                                           //Class Book

//---------------------------------------------------------------------------------------------

class Node                                                              //Class Node
{
    friend class LinkedList;
private:
    Book *_book;
    Node *_next;
public:
    Node(void);
    Node(Book*);
    Node(Book*,Node*);
    ~Node(void);
};

Node::Node(void)
{
    _book = NULL;
    _next = NULL;
}

Node::Node(Book *book)
{
    _book = book;
    _next = NULL;
}

Node::Node(Book *book, Node *next)
{
    _book = book;
    _next = next;
}                                                                       //Class Node

//---------------------------------------------------------------------------------------------

class LinkedList                                                        //Class LinkedList
{
private:
    Node *_head;
    Node *_tail;
public:
    LinkedList(void);
    LinkedList(Book*);
    ~LinkedList(void);
    void insert_front(Book*);
    void insert_rear(Book*);
    void print_list(void);
};

LinkedList::LinkedList(void)
{
    _head = NULL;
    _tail = NULL;
}


LinkedList::LinkedList(Book *book)
{
    _head = new Node(book);
    _tail = _head;
}                                                                       //Class LinkedList

//---------------------------------------------------------------------------------------------

void LinkedList::insert_front(Book *book)
{
    if(_head == NULL)
    {
        _head = new Node(book);
        _tail = _head;
    }
    else
        _head = new Node(book, _head);
}

void LinkedList::insert_rear(Book *book)
{
    if(_head == NULL)
    {
        _head = new Node(book);
        _tail = _head;
    }
    else
    {
        _tail -> _next = new Node(book);
        _tail = _tail -> _next;
    }
 }

void LinkedList::print_list(void)
{
    Node *temp = _head;
    while(temp!= NULL)
    {
        cout << temp -> _book -> _title << endl;
        cout << temp -> _book -> _author << endl;
        cout << temp -> _book -> _publisher << endl;
        temp = temp -> _next;
        cout << endl;
    }
}

LinkedList::~LinkedList(void)
{

}

//---------------------------------------------------------------------------------------------
                                                    //Main
int main(void)
{
    LinkedList myList;
    ifstream myFile("input.txt");

    string title;
    string author;
    Date published;         // was "Date published(int,int,int);"
    string publisher;
    float price;
    string isbn;
    int page;
    int copies;

    while(myFile)
    {
        getline(myFile,title);
        getline(myFile,author);
        //getline(myFile,published);
        getline(myFile,publisher);
        //getline(myFile,price);
        getline(myFile,isbn);
        //getline(myFile,page);
        //getline(myFile,copies);

        myList.insert_front(new     Book(title,author,published,publisher,price,isbn,page,copies));
    }

    myList.print_list();

    return 0;
}


我感兴趣的错误是:

assignment3.cpp:213:33:错误:没有匹配的构造函数用于初始化
      '书'
  ...(书名,作者,已出版,出版者,价格,isbn,页面,副本));
     ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
assignment3.cpp:67:7:注意:候选构造函数不可行:未知
      第三个参数从'Date(int,int,int)'到'Date'的转换
Book :: Book(字符串标题,字符串作者,发布日期,字符串发布...
      ^
assignment3.cpp:38:7:注意:候选构造函数(隐式副本
      构造函数)不可行:需要1个参数,但提供了8个
课本
      ^
assignment3.cpp:54:7:注意:候选构造函数不可行:要求0
      论点,但提供了8个
Book :: Book(void)
      ^
产生1个错误。

我提出了更改建议,但现在出现了另一个错误:

架构x86_64的未定义符号:
  “ Date ::〜Date()”,引用自:
      Book :: Book()在Assignment3-0f3b1c.o中
      Book :: Book(std :: __ 1 :: basic_string,std :: __ 1 :: allocator>,std :: __ 1 :: basic_string,std :: __ 1 :: allocator>,Date,std :: __ 1 :: basic_string,std :: __ 1 :: allocator>,float,std :: __ 1 :: basic_string,std :: __ 1 :: allocator>,int,int)在分配3-0f3b1c.o中
      _main in assignment3-0f3b1c.o
ld:找不到架构x86_64的符号
clang:错误:链接器命令失败,退出代码为1(使用-v查看调用)

最佳答案

以下是函数声明(published,需要3个int,返回Date):

Date published(int,int,int)


您想创建一个变量:

Date published;


或者,如果您想明确表明您关心零初始化:

Date published{};

关于c++ - 错误:没有匹配的构造函数用于初始化,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/39934731/

10-11 22:43
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