意外的 #ifndef，没有匹配的函数调用（链表 C++）

Question

你好，我目前正在做一个链表项目，但在做的时候遇到了一些错误，我似乎无法解决。我遇到的第一个错误是 undetermined #ifndef。我感到困惑的是我没有在 header 中#include 源文件。

我遇到的第二个错误是在我的 main.cpp 中，我收到一条错误消息“没有匹配的函数调用 'List::AddNode(double, double, double等)".

我已经发布了所有三个文件，希望有人能帮助我找出我收到的这些错误，谢谢。

编辑：感谢那些帮助过我的人，这已经解决了我的问题，但现在我收到新的错误提示
“对 List::List() 的未定义引用”，

未定义引用 List::AddNode(double, double, double, double, double, double, double, double)',

对“List::PrintList()”的未定义引用。

主要

#include <iostream>
#include <cstdlib>
#include "List.h"

using namespace std;

int main()
{
    List Moe;

    Moe.AddNode(23.00, 7.00, 12.75, 7.65, 1.00,45.00, 0.18, 50.00);
    Moe.PrintList();
}

Header 文件

#ifndef LIST_H_INCLUDED
#define LIST_H_INCLUDED
#endif LIST_H_INCLUDED

using namespace std;
class List
{
private:

    struct node{
        double adults, children,costA,costC,dessert,room,tt,deposit;
        node* next, *link;

    };
    typedef struct node* nodePtr;

    nodePtr head;
    nodePtr curr;
    nodePtr temp;

public:
    List();
    void AddNode(double addAdults,double addChildren, double addCostA, double addCostC,double addDessert, double addRoom, double addTT, double addDeposit);
    void PrintList();
};

CPP 文件

#include <cstdlib>
#include <iostream>
#include "List.h"

using namespace std;

List::List()
{
    head = NULL;
    curr = NULL;
    temp = NULL;
}
void List::AddNode(double addAdults,double addChildren, double addCostA, double addCostC,double addDessert, double addRoom, double addTT, double addDeposit)
{
    nodePtr n = new node;
    n->next = NULL;

    n->adults = addAdults;
    //cout >> "Number of Adults: " >> addAdults;
    n->children = addChildren;
    n->costA = addCostA;
    n->costC = addCostC;
    n->dessert = addDessert;
    n->room = addRoom;
    n->tt = addTT;
    n->deposit = addDeposit;

    if(head != NULL)
    {
        curr = head;
        while(curr -> next != NULL)
        {
            curr = curr->next;
        }
        curr->next = n;
    }
    else
    {
        head = n;
    }
}
void List::PrintList()
{
    curr = head;
    while(curr != NULL)
    {
        cout << "Total cost for adult meals:        $" << (curr -> adults) * (curr -> costA) << endl;
            cout << "Total cost for child meals:        $" << ((curr -> children) *(curr -> costA)) * 0.60 << endl;
            cout << "Total cost for dessert:            $" << ((curr -> adults) + (curr -> children)) * (curr -> dessert) << endl;
            cout << "Total food cost:                   $" <<(curr -> adults) * (curr -> costA) +
                                                           (curr -> children) *(curr -> costA) * 0.60 +
                                                           ((curr -> adults) + (curr -> children)) * (curr -> dessert)<< endl;
            cout << "Plus tips and tax:                 $" <<curr -> tt * ((curr -> adults) * (curr -> costA) +
                                                           (curr -> children) *(curr -> costA) * 0.60 +
                                                           ((curr -> adults) + (curr -> children)) * (curr -> dessert)) <<
                                                            " (Does NOT Include Room Fee)" << endl;
            cout << "Plus room fee:                     $" << (curr -> room) << endl;
            cout << "Less Deposit:                      $";
            cin >>curr -> deposit;
            cout << "" << endl;
            cout << "Balance Due:                      $" << /*FOOD COST*/((curr -> adults) * (curr -> costA) +
                                                           (curr -> children) *(curr -> costA) * 0.60 +
                                                           ((curr -> adults) + (curr -> children)) * (curr -> dessert)) +
                                                           /*TIPS & TAX*/ (curr -> tt * ((curr -> adults) * (curr -> costA) +
                                                           (curr -> children) *(curr -> costA) * 0.60 +
                                                           ((curr -> adults) + (curr -> children)) * (curr -> dessert))) +
                                                           /*ROOM FEE */ ((curr -> room)) - /*DEPOSIT*/ (curr -> deposit) << endl;
            cout << "" << endl;

            curr = curr->next;

    }
}

Answer 1

您遇到的 main 错误与头部防护有关。目前，您这样做：

#ifndef LIST_H_INCLUDED
#define LIST_H_INCLUDED
#endif LIST_H_INCLUDED

before 你开始你的代码，这实际上没有任何效果，因为 header guards 实际上没有 guard 任何东西。因此，当您包含 "List.h" 两次时，编译器会报错。正确的做法是

#ifndef LIST_H_INCLUDED
#define LIST_H_INCLUDED

//... List code ...

#endif //Endif goes at the end of file

因此，如果文件 "List.h" 已经被包含，您就不会意外地再次包含它。另外，如果你想让自己更容易，并且在支持该操作的编译器上编译，你可以使用以下内容：

#pragma once

//... List code ...

#pragma once 与 include guards 做同样的事情，尽管它是非标准的，但在很大程度上得到了大多数（如果不是全部）新编译器的支持。

Answer 2

您误解了 header guards 的使用方式：您需要一个条件编译语句来保护 header 的全部内容，而不仅仅是 #define。将#endif移动到文件末尾，去掉或注释掉末尾的LIST_H_INCLUDED：

#ifndef LIST_H_INCLUDED
#define LIST_H_INCLUDED

using namespace std;
class List
{
private:

    struct node{
        double adults, children,costA,costC,dessert,room,tt,deposit;
        node* next, *link;

    };
    typedef struct node* nodePtr;

    nodePtr head;
    nodePtr curr;
    nodePtr temp;

public:
    List();
    void AddNode(double addAdults,double addChildren, double addCostA, double addCostC,double addDessert, double addRoom, double addTT, double addDeposit);
    void PrintList();
};

#endif /* LIST_H_INCLUDED */

意外的 #ifndef，没有匹配的函数调用（链表 C++）

Unexpected #ifndef, No Matching Function Call (Linked List C++)

c++

linked-list

function-calls

ifndef