无法从链接列表末尾删除节点

Question

我有一个关于删除链接列表的最后一个节点的问题。我把printf函数检查并找到错误，但我找不到它。这是我的代码，用于从未排序的链接列表中删除最后一个节点。最后，你会看到四个添加功能，他们正在成功工作。唯一的缺陷是从最后删除。

void del_Node(LIST* list, int counter) { 

    if(counter == 0) 
     return; 

    NODE* temp = list->header; 

    int count=1; 

    if(list->header == NULL) { 
     printf("The list is already EMPTY\n"); 
     return; 
    } 

    while(count != counter) { 
     temp = temp->next; 
     count++; 
    } 

    printf("%s %s\n", temp->first_name, temp->last_name); 

    if(list->counter == 1) { // Condition for deleting the last node of the linked list 

     list->header = NULL; 
     list->tail = NULL; 

     temp->next = NULL; 
     temp->pre = NULL; 

     list->counter--; 

    } 

    else if(list->header == temp) { // Condition for deleting from the beginnig 

     list->header = temp->next; 

     printf("%s listenin basından silindi\n", temp->first_name); 

     temp->next = NULL; 
     temp->pre = NULL; 

     list->counter--; 

    } 

    else if (list->tail == temp) { // Condition for deleting from the end 

     list->tail = temp->pre; 

     printf("%s normal listenin tailinden silindi yeni tail %s\n", temp->first_name, temp->pre->first_name); 

     temp->next = NULL; 
     temp->pre = NULL; 

     list->counter--; 

    } 

    else { // Condition from deleting from the middle 

     temp->pre->next = temp->next; 

     temp->next->pre = temp->pre; 

     printf("%s normal listede %s------%s arasından silindi\n",temp->first_name, temp->next->first_name, temp->pre->first_name); 

     temp->next = NULL; 
     temp->pre = NULL; 

     list->counter--; 

    } 

    del_fn_name(list, temp); 
    del_ln_name(list, temp); 
    del_bdt(list, temp); 
    del_city(list, temp); 

    free(temp); 

    printf("List->counter = %d %d %d\n", list->counter, list->fn_count, list->ln_count); 
} 

Answer 1

看来你忘了temp->pre->next = NULL;