编译C时出现奇怪的错误

Question

所以我现在已经有一段时间了,似乎无法找到问题,甚至我的老师也找不到.

所以我有这个头文件:

    #include <stdio.h>
    #include <stdbool.h>

    void print_list(void);
    int delete_from_list(int iWordID);
    wordData * create_list(int iWordID, char * cWord);
    wordData * add_to_list(int iWordID, char * cWord, bool add_to_end);
    wordData * search_in_list(int iWordID, struct wordData **prev);
    void print_list(void);

    typedef struct _wordData
    {
    int iWordID;
    char * cWord;
    struct _wordData *next;

    } wordData;

在我包含此标头的C文件中,我有这个功能:

    wordData* create_list(int iWordID, char * cWord)
    {
     //printf(cWord);

    printf("\n creating list with headnode as [%d] %s\n",iWordID,cWord);
    wordData *ptr = (struct wordData*)malloc(sizeof(struct wordData));
    if(NULL == ptr)
    {
    printf("\n Node creation failed \n");
    return NULL;
    }

    ptr->iWordID = iWordID;

    //char * temp = (char*)malloc(sizeof(cWord));
    ptr -> cWord = cWord;


    ptr->next = NULL;

    head = curr = ptr;
    return ptr;
    }

因此,当我编译时发生此错误:list.h | 6 | error:在'*'标记之前预期'=',',',';','asm'或' attribute '

我已经搜索了一些关于这个错误的错误,但似乎找不到一个可以帮助我的错误.

请帮忙 :)

Answer 1

将wordData struct定义移动到标题的顶部 - 它需要在您在原型中使用它之前(或者您需要转发声明它).

#include <stdio.h>
#include <stdbool.h>

typedef struct _wordData
{
int iWordID;
char * cWord;
struct _wordData *next;

} wordData;

void print_list(void);
int delete_from_list(int iWordID);
wordData * create_list(int iWordID, char * cWord);
wordData * add_to_list(int iWordID, char * cWord, bool add_to_end);
wordData * search_in_list(int iWordID, struct wordData **prev);
void print_list(void);

Answer 2

将结构定义移到头文件中使用的位置上方:

#include <stdio.h>
#include <stdbool.h>

typedef struct _wordData
{
int iWordID;
char * cWord;
struct _wordData *next;

} wordData;

void print_list(void);
int delete_from_list(int iWordID);
wordData * create_list(int iWordID, char * cWord);
wordData * add_to_list(int iWordID, char * cWord, bool add_to_end);
wordData * search_in_list(int iWordID, struct wordData **prev);
void print_list(void);

你必须在使用它之前定义它.

wordData * search_in_list(int iWordID, struct wordData **prev);
                                             ^
                                             |
                             This is also incorrect. Should be "wordData **prev"
                              That's what the typedef is for.