我在运行这个包含单词数据的链表实现时遇到了一些问题。问题是,当我尝试打印我插入的单词时,我什么也没有得到。我为此苦恼不已,不知道哪里出了错。我希望这不是什么愚蠢的错误。无论如何,以下是代码 -
typedef struct node
{
void *data;
struct node *next;
} NODE;
NODE *new_node(void *data)
{
NODE *new = malloc(sizeof(NODE));
if(new)
{
new->data = data;
new->next = NULL;
return new;
}
else
{
return NULL;
}
}
void print_list(NODE *head, void (print_fn) (void*))
{
if(head && head->next)
{
while(head->next)
{
if(print_fn)
print_fn(head->data);
else
printf("Word: %s\n", (char *)head->data);
head = head->next;
}
}
return;
}
void append(NODE **head, NODE *node)
{
NODE *tmp = *head;
if(tmp && node)
{
while(tmp->next)
tmp = tmp->next;
(*head)->next = node; /*add as last node*/
}
return;
}
NODE *create_list()
{
FILE *dict_file = fopen("trial.txt", "r");
if(dict_file)
{
NODE *head = new_node(NULL);
if(!head) return NULL;
char word[20];
int first = TRUE;
memset(word, '\0', 20);
while(fgets(word, sizeof(word), dict_file) != NULL )
{
if(first)
{
head->data = (void*)word;
first = FALSE;
}
else
{
append(&head, new_node((void*)word));
}
}
fclose(dict_file);
return head;
}
else
{
printf("ERROR: File not found");
return NULL;
}
}
int main(int argc, char *argv[])
{
NODE *head = create_list();
if(!head)
{
printf("ERROR: Either malloc() failed or data not found\n");
return FALSE;
}
else
{
print_list(head, NULL);
return TRUE;
}
}