双链 list.Segmentation 故障

Question

我的任务是删除奇数块。例如： 0-4-5-7-9-10 到 0-4-10。为了实现这一点，我编写了这个函数：

void delete_odd_el(Tsnum *&Start)
{
    Tsnum *wp, *pp, *del_el;
    wp = Start;
    while(wp != nullptr)
    {
      if(wp->num % 2 == 1)
      {

        while(wp!=nullptr)
        {
          if(wp->num % 2 == 0) break;
          del_el = wp;
          wp = wp->next;
          wp->prev = del_el->prev;
          delete del_el;
        }
      }
      wp = wp->next;
    }
}

但是当我运行它时，我遇到了分段错误。知道如何解决这个问题吗？

Answer 1

伙计们，如果这对你有帮助：

   void delete_odd_el(Tsnum *&Start)
    {
        Tsnum *wp;
        wp = Start;
        while(wp!= nullptr)
        {
            if(wp->num % 2 ==1 && wp->next !=nullptr && wp->next->num % 2 == 1)
            {
                while(wp != nullptr && wp->num % 2 == 1)
                {
                    if(wp->prev !=nullptr)
                    {
                        wp = wp->prev;
                        if(wp->next->next != nullptr)
                        {
                            wp->next = wp->next->next;
                            delete wp->next->prev;
                            wp->next->prev = wp;
                        }
                        else

                        {
                            delete wp->next;
                            wp->next = nullptr;
                        }
                        wp = wp->next;
                    }
                    else
                    {
                        if(wp->next != nullptr)
                        {
                            wp = wp->next;
                            delete wp->prev;
                            wp->prev = nullptr;
                            Start = wp;
                        }
                        else
                        {
                            delete wp;
                            wp = nullptr;
                            Start = wp;
                        }
                    }
                }
            }
            else
                wp = wp->next;
        } 
    }

双链 list.Segmentation 故障

Doubly linked list.Segmentation fault

c++

doubly-linked-list