我正在编写一个程序,它在单独的头文件中包含我的函数声明和定义以及结构定义。 .cpp文件和functions.h文件都位于同一文件夹中。但是,我一直得到臭名昭着的#34; 未定义的架构x86_64符号:"错误。我已经阅读了许多关于此错误的其他问题,但我无法解决此问题。这是代码:
我在Mac OSX中使用终端进行编码。我正在运行优胜美地。但是,我将其复制到Windows并在PuTTY中运行它并发生了同样的错误消息。
对于functions.h头文件:
#ifndef FUNCTIONS_H
#define FUNCTIONS_H
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
struct Books
{
int ISBN;
string Author;
string Publisher;
int Quantity;
double Price;
};
class functions
{
public:
void READ_INVENTORY(Books, int, int);
};
// Function definitions
void READ_INVENTORY(Books* list, int max, int position)
{
cout << "You have chosen to read inventory from a file.\n"
<< "Press ENTER to continue...\n";
cin.get();
ifstream inputFile;
inputFile.open("inventory.dat");
if (!inputFile)
cout << "Error: Input file cannot be found\n";
else
{
inputFile >> list[position].ISBN;
inputFile >> list[position].Author;
inputFile >> list[position].Publisher;
inputFile >> list[position].Quantity;
inputFile >> list[position].Price;
cout << "The following data was read from inventory.dat:\n\n"
<< "ISBN: " << list[position].ISBN << endl
<< "Author: " << list[position].Author << endl
<< "Publisher: " << list[position].Publisher << endl
<< "Quantity: " << list[position].Quantity << endl
<< "Price: " << list[position].Price << endl << endl;
cout << "Press ENTER to return to the main menu...\n";
cin.get();
}
}
#endif
这是.cpp文件:
#include <iostream>
#include <string>
#include <fstream>
#include "functions.h"
using namespace std;
int main()
{
const int MAX_SIZE = 100;
int size, choice;
functions bookstore;
Books booklist[MAX_SIZE];
cout << "Thank you for using Justin's Bookstore Manager\n\n";
do
{
cout << "Please select a choice from the menu below:\n\n"
<< "\t\t MENU\n"
<< "\t----------------------------\n\n"
<< "\t1: Read inventory from a file\n"
cin >> choice;
size = choice;
switch (choice)
{
case 1: bookstore.READ_INVENTORY(booklist[choice], MAX_SIZE, size);
break;
default:
{
cout << "Sorry, that is not a valid selection\n\n";
}
}
} while (choice != 6);
return 0;
}
最后,这是整个错误消息:
架构x86_64的未定义符号: &#34; functions :: READ_INVENTORY(Books,int,int)&#34;,引自: _main in bookstore-9693df.o clang:错误:链接器命令失败,退出代码为1(使用-v查看调用)
所以这就是归结为:这个错误是由编写程序的方式还是由与程序无关的外部冲突引起的?
答案 0 :(得分:1)
在定义函数时,需要将函数::放在READ_INVENTORY()之前。所以functions.h中的定义如下:
void functions::READ_INVENTORY(Books* list, int max, int position)
{
/* do stuff */
}
在.cpp文件中实现这些功能通常是更好的做法。