c++学习笔记_c++实现双链表-创新互联

#include "stdafx.h"
#include
#include
#include "conio.h"
using namespace std;

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struct _DOUBLE_LINK_NODE //定义一个双链表结构
{
   char * data;
   struct _DOUBLE_LINK_NODE* prev; //双链表的前驱
   struct _DOUBLE_LINK_NODE* next;//双链表的后驱
} ;

class DoubleList
{
private:
public:
   struct _DOUBLE_LINK_NODE * Head;
   DoubleList()
   {
       Head = (struct _DOUBLE_LINK_NODE *) malloc (sizeof(_DOUBLE_LINK_NODE));
       memset(Head, 0, sizeof(_DOUBLE_LINK_NODE));
   }
   ~DoubleList()
   {
   }
   struct _DOUBLE_LINK_NODE * create_double_link_node(char * value)
   {
       struct _DOUBLE_LINK_NODE* pnode;
       pnode =(_DOUBLE_LINK_NODE *)malloc(sizeof(_DOUBLE_LINK_NODE));
       memset(pnode,0,sizeof(_DOUBLE_LINK_NODE));
       pnode->data=(char *)malloc(strlen(value)+1);
       memset(pnode->data,0,strlen(value)+1);
       memcpy(pnode->data,value,strlen(value));

       pnode->prev=(struct _DOUBLE_LINK_NODE *)malloc(sizeof(_DOUBLE_LINK_NODE));
       memset(pnode->prev,0,sizeof(_DOUBLE_LINK_NODE));
       memcpy(pnode->prev,pnode,sizeof(_DOUBLE_LINK_NODE));
       return pnode;
   }

   _DOUBLE_LINK_NODE* find_data_in_double_link(char * data)
   {
       _DOUBLE_LINK_NODE* pNode = Head;
       int count=count_number_in_double_link();
       //for(;pNode && pNode->next;pNode = pNode->next)
       if (data==NULL)
       {
           return NULL;
       }
       else
       {
           for(int i=0;i           {
               if (pNode->data && strcmp(pNode->data, data) == 0)
               {
                   return pNode;
               }
               else
               {
                   pNode = pNode->next;
               }
           }
       }
       return NULL;
   }

   bool insert_data_into_double_link(_DOUBLE_LINK_NODE *node,char * data)
   {
       _DOUBLE_LINK_NODE * pNode=Head;
       _DOUBLE_LINK_NODE * findNode= NULL;
       int count=count_number_in_double_link();
       if (find_data_in_double_link(data)!=NULL)
       {
           findNode=find_data_in_double_link(data);
       }
       else
       {
           for(int i=0;i           {
               if (pNode->next==NULL)
               {
                   findNode=pNode;
               }
               else
               {
                   pNode = pNode->next;
               }
           }
       }
       if (pNode->data==NULL && pNode->next ==NULL)
       {
           pNode->next=node->prev;
           node->prev=pNode;
       }
       else
       {
           if (findNode->next==NULL)
           {
               pNode->next=node->prev;
               node->prev=pNode;
           }
           else
           {
               node->next=findNode->next->prev;
               findNode->next=node;
               node->prev=findNode->prev;
               node->next->prev=node;
           }
       }
       return true;
   }

   bool delete_data_from_double_link(char * data)
   {
       _DOUBLE_LINK_NODE* pNode;
       pNode=find_data_in_double_link(data);

       //*pNode->next->prev = *pNode->prev;
       if (pNode->next!=NULL)
       {
           pNode->next->prev=pNode->prev;
           pNode->prev->next = pNode->next;
       }
       else
       {
           pNode->prev->next = pNode->next;
       }
       free(pNode);
       return true;
   }

   void print_double_link_node()
   {
       _DOUBLE_LINK_NODE *DoubleList =Head;
       while(NULL != DoubleList){
           printf("%s\n", DoubleList->data);
           DoubleList = DoubleList ->next;
       }
   }

   int count_number_in_double_link()
   {
       int count = 0;
       _DOUBLE_LINK_NODE *DoubleList =Head;

       while(NULL != DoubleList){
           count ++;
           DoubleList = DoubleList->next;
       }
       return count;
   }
};

int _tmain(int argc, _TCHAR* argv[])
{
   DoubleList *list=new DoubleList();
   char * str="Hello word！你好~~";
   char * dd="jsgw";
   _DOUBLE_LINK_NODE *node= list->create_double_link_node(str);
   _DOUBLE_LINK_NODE * node1=list->create_double_link_node(dd);
   list->insert_data_into_double_link(node,NULL);
   list->insert_data_into_double_link(node1,NULL);
   node= list->create_double_link_node("hello world!");

   list->insert_data_into_double_link(node,"adf");

   int d=list->count_number_in_double_link();
   list->print_double_link_node();
   printf("链表中共有%d条数据\n",d);

   printf("删除数据：");
   char * str1="hello world!";

   int a;
   cin>>a;
   if (a==0)
   {
       list->delete_data_from_double_link(str1);
       list->print_double_link_node();
   }
   cin.get();
}

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