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/