int DeleteLinkList(LinkList *list, char *name);
int ReviseLinkList(LinkList *list, char *name, DATATYPE data);
int DestroyLinkList(LinkList *list);
int InsertTailLinkList(LinkList *list, DATATYPE data);
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完整代码展示
cpp
#include <stdio.h>
#include "doulink.h"
#include <string.h>
int findbyname(DATATYPE*data,void* arg)
{
return (0 == strcmp(data->name,(char*)arg));
}
int findbyage(DATATYPE*data,void* arg)
{
return data->age == *(int*)arg;
}
int main()
{
DATATYPE data[5]={
{"zhangsan",'m',20,70},
{"lisi",'f',21,60},
{"wangmazi",'m',25,80},
{"liubei",'f',30,85},
{"caocao",'f',40,90},
};
DouLinkList* dl = CreateDouLinkList();
InsertHeadLinkList(dl,&data[0]);
InsertHeadLinkList(dl,&data[1]);
InsertHeadLinkList(dl,&data[2]);
ShowDouLinkList(dl,DIR_FORWARD);
printf("-------------back---------------\n");
ShowDouLinkList(dl,DIR_BACKWARD);
printf("-------------find---------------\n");
// char want_name[]="lisi";
// //DouLinkNode* tmp = FindLinkList(dl,findbyname,want_name);
// int want_age = 25;
// DouLinkNode* tmp = FindLinkList(dl,findbyage,&want_age);
// if(NULL == tmp)
// {
// printf("can't find person ,name:%s\n",want_name);
// }
// else
// {
// printf("%s:%d\n",tmp->data.name,tmp->data.score);
// }
// RevertDouLinkList(dl);
// printf("-------------rev---------------\n");
// ShowDouLinkList(dl,DIR_FORWARD);
// DeleteLinkList(dl,findbyname,"lisi");
// printf("-------------del forware---------------\n");
// ShowDouLinkList(dl,DIR_FORWARD);
// printf("-------------back---------------\n");
// ShowDouLinkList(dl,DIR_BACKWARD);
// ModifyDouLinkList(dl,findbyname,"zhangsan",&data[3]);
// printf("-------------modify---------------\n");
// ShowDouLinkList(dl,DIR_FORWARD);
InserPosDouLinkList(dl,&data[3],3);
printf("-------------pos---------------\n");
ShowDouLinkList(dl,DIR_FORWARD);
printf("-------------back---------------\n");
ShowDouLinkList(dl,DIR_BACKWARD);
DestroyDouLinkList(&dl);
printf("Hello World!\n");
return 0;
}
cpp
#include "doulink.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
DouLinkList *CreateDouLinkList()
{
//DouLinkList dl ;
DouLinkList* dl = (DouLinkList*)malloc(sizeof(DouLinkList));
if(NULL == dl)
{
perror("CreateDouLinkList malloc");
//exit(1);
return NULL;
}
dl->head =NULL;
dl->clen = 0 ;
return dl;
}
int InsertHeadLinkList(DouLinkList *list, DATATYPE *data)
{
DouLinkNode*newnode = malloc(sizeof(DouLinkNode));
if(NULL == newnode)
{
perror("InsertHeadLinkList malloc");
return 1;
}
memcpy(&newnode->data,data,sizeof(DATATYPE));
newnode->next = NULL;
newnode->prev= NULL;
if(0==list->clen)//empty
{
list->head = newnode;
}
else
{
newnode->next = list->head;
list->head->prev = newnode;
list->head = newnode;
}
list->clen++;
return 0;
}
int ShowDouLinkList(DouLinkList *list, DIRECT direct)
{
int i = 0 ;
DouLinkNode* tmp = list->head;
if(direct==DIR_FORWARD)
{
for(i=0;i<GetSizeDouLinkList(list);i++)
{
printf("%s %c %d %d\n",tmp->data.name,tmp->data.sex,tmp->data.age,tmp->data.score);
tmp=tmp->next;
}
}
else
{
while(tmp->next)
{
tmp=tmp->next;
}
for(i=0;i<GetSizeDouLinkList(list);i++)
{
printf("%s %c %d %d\n",tmp->data.name,tmp->data.sex,tmp->data.age,tmp->data.score);
tmp=tmp->prev;
}
}
return 0;
}
int GetSizeDouLinkList(DouLinkList *list)
{
return list->clen;
}
DouLinkNode *FindLinkList(DouLinkList *list, PFUN fun, void *arg)
{
DouLinkNode* tmp = list->head;
int size = GetSizeDouLinkList(list);
int i = 0;
for(i = 0 ;i<size;i++)
{
//if(0==strcmp(tmp->data.name))
if(fun(&tmp->data,arg))
{
return tmp;
}
tmp= tmp->next;
}
return NULL;
}
int RevertDouLinkList(DouLinkList *list)
{
int size = GetSizeDouLinkList(list);
if(size<2)
{
return 0;
}
DouLinkNode* prev= NULL;
DouLinkNode* tmp = list->head;
DouLinkNode*next= tmp->next;
while(1)
{
tmp->next = prev;
tmp->prev = next;
prev= tmp;
tmp = next;
if(NULL == tmp)
{
break;
}
next =next->next;
}
list->head = prev;
return 0;
}
int DeleteLinkList(DouLinkList *list, PFUN fun, void *arg)
{
if(NULL == list)
{
fprintf(stderr,"DouLinkList is null");
return 1;
}
if(IsEmptyDouLinkList(list))
{
fprintf(stderr,"DouLinkList is empty");
return 1;
}
DouLinkNode* ret = FindLinkList(list,fun,arg);
if(NULL==ret)
{
fprintf(stderr,"DeleteLinkList error,cant find\n");
return 1;
}
if(ret == list->head)
{
list->head = ret->next;
list->head->prev = NULL;
}
else
{
if(ret->next)
ret->next->prev = ret->prev;
ret->prev->next = ret->next;
}
free(ret);
list->clen--;
return 0;
}
int IsEmptyDouLinkList(DouLinkList *list)
{
return 0 == list->clen;
}
int ModifyDouLinkList(DouLinkList *list, PFUN fun, void *arg, DATATYPE *data)
{
DouLinkNode* ret = FindLinkList(list,fun,arg);
if(NULL == ret)
{
fprintf(stderr,"ModifyDouLinkList error,cant find\n");
return 1;
}
memcpy(&ret->data,data,sizeof(DATATYPE));
return 0;
}
int DestroyDouLinkList(DouLinkList **list)
{
DouLinkNode* tmp=(*list)->head;
while(tmp)
{
(*list)->head=(*list)->head->next;
free(tmp);
tmp = (*list)->head;
}
free(*list);
(*list)= NULL;
return 0;
}
int InserPosDouLinkList(DouLinkList *list, DATATYPE *data,int pos)
{
if(pos<0 ||pos>GetSizeDouLinkList(list))
{
fprintf(stderr,"InserPosDouLinkList error,index error\n");
return 1;
}
if(IsEmptyDouLinkList(list) || 0 == pos)
{
return InsertHeadLinkList(list,data);
}
else
{
DouLinkNode* tmp = list->head;
tmp= list->head;
DouLinkNode* newnode = (DouLinkNode*)malloc(sizeof(DouLinkNode));
if(NULL == newnode)
{
perror("InserPosDouLinkList malloc");
return 1;
}
memcpy(&newnode->data,data,sizeof(DATATYPE));
newnode->prev = NULL;
newnode->next = NULL;
int i = pos-1;
while(i--)
{
tmp=tmp->next;
}
newnode ->prev = tmp;
newnode->next = tmp->next;//这时候都是NULL,如果是尾插入不走if
if(tmp->next)
{
tmp->next->prev = newnode;//中间插入
}
tmp->next = newnode;
}
list->clen++;
return 0;
}
cpp
#ifndef DOULINK_H
#define DOULINK_H
typedef struct{
char name[32];
char sex;
int age;
int score;
}DATATYPE;
typedef int (*PFUN)(DATATYPE*data,void* arg);//表示fun()中的参数书形式
typedef struct node {
DATATYPE data;
struct node *next,*prev;
}DouLinkNode;
typedef struct{
DouLinkNode *head;
int clen;
}DouLinkList;
typedef enum{DIR_FORWARD,DIR_BACKWARD}DIRECT;
DouLinkList* CreateDouLinkList();
int InsertHeadLinkList(DouLinkList *list, DATATYPE *data);
int ShowDouLinkList(DouLinkList *list,DIRECT direct);
int GetSizeDouLinkList(DouLinkList *list);
DouLinkNode *FindLinkList(DouLinkList *list, PFUN fun,void* arg);
int RevertDouLinkList(DouLinkList *list);
int DeleteLinkList(DouLinkList *list, PFUN fun,void* arg);
int IsEmptyDouLinkList(DouLinkList *list);
int ModifyDouLinkList(DouLinkList *list,PFUN fun,void* arg,DATATYPE *data);
int DestroyDouLinkList(DouLinkList **list);
int InserPosDouLinkList(DouLinkList *list,DATATYPE *data,int pos);
#endif // DOULINK_H
序表和链表 优缺点
存储方式:
顺序表是一段连续的存储单元
链表是逻辑结构连续物理结构(在内存中的表现形式)不连续
时间性能,
查找 顺序表O(1)
链表 O(n)
插入和删除
顺序表 O(n)
链表 O(1)
空间性能
顺序表 需要预先分配空间,大小固定
链表, 不需要预先分配,大小可变,动态分配
循环链表
简单的来说,就是将原来单链表中最有一个元素的next指针指向第一个元素或头结点,链表就成了一个环,头尾相连,就成了循环链表。circultlar linker list.
注意非空表,和空表。多数会加入头结点。
原来结束的条件是
p->next != NULL ------->>>>> p-next != Head
双向链表
double link list。
typedef struct DulNode
{
ElemType date;
struct DulNode *pri;
sturct DulNode *next;
}DulNode,*DuLinkList;
习题
1)双向链表逆序
2)实现mplay的播放列表
main.c
cpp
#include <stdio.h>
#include "doulink.h"
#include <string.h>
#include "func.h"
#include <stdlib.h>
void show_menu( DouLinkList* dl)
{
printf("1.show_list\n");
printf("2.prev\n");
printf("3.next\n");
printf("4.end\n");
char buf[10]={0};
fgets(buf,sizeof(buf),stdin);
int num = atoi(buf);
switch (num) {
case 1:
ShowDouLinkList(dl,DIR_FORWARD);
break;
case 2:
GetPrev(dl);
break;
case 3:
Getnext(dl);
break;
case 4:
exit(1);
break;
default:
break;
}
}
int main()
{
DouLinkList* dl = CreateDouLinkList();
do_ls("/home/linux",dl);
ShowDouLinkList(dl,DIR_FORWARD);
char *pathname=NULL;
while(1)
{
show_menu(dl);
pathname = GetCurrent(dl);
printf("currnt play file:%s\n",pathname);
}
//atexit();
printf("Hello World!\n");
return 0;
}
doulink.c
cpp
#include "doulink.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
DouLinkList *CreateDouLinkList()
{
//DouLinkList dl ;
DouLinkList* dl = (DouLinkList*)malloc(sizeof(DouLinkList));
if(NULL == dl)
{
perror("CreateDouLinkList malloc");
//exit(1);
return NULL;
}
dl->head =NULL;
dl->clen = 0 ;
dl->currnet =NULL;
return dl;
}
int InsertHeadLinkList(DouLinkList *list, DATATYPE *data)
{
DouLinkNode*newnode = malloc(sizeof(DouLinkNode));
if(NULL == newnode)
{
perror("InsertHeadLinkList malloc");
return 1;
}
memcpy(&newnode->data,data,sizeof(DATATYPE));
newnode->next = NULL;
newnode->prev= NULL;
if(0==list->clen)//empty
{
list->head = newnode;
}
else
{
newnode->next = list->head;
list->head->prev = newnode;
list->head = newnode;
}
list->clen++;
return 0;
}
int ShowDouLinkList(DouLinkList *list, DIRECT direct)
{
int i = 0 ;
DouLinkNode* tmp = list->head;
if(direct==DIR_FORWARD)
{
for(i=0;i<GetSizeDouLinkList(list);i++)
{
printf("%d %s\n",i,tmp->data.pathname);
tmp=tmp->next;
}
}
return 0;
}
int GetSizeDouLinkList(DouLinkList *list)
{
return list->clen;
}
DouLinkNode *FindLinkList(DouLinkList *list, PFUN fun, void *arg)
{
DouLinkNode* tmp = list->head;
int size = GetSizeDouLinkList(list);
int i = 0;
for(i = 0 ;i<size;i++)
{
//if(0==strcmp(tmp->data.name))
if(fun(&tmp->data,arg))
{
return tmp;
}
tmp= tmp->next;
}
return NULL;
}
int RevertDouLinkList(DouLinkList *list)
{
int size = GetSizeDouLinkList(list);
if(size<2)
{
return 0;
}
DouLinkNode* prev= NULL;
DouLinkNode* tmp = list->head;
DouLinkNode*next= tmp->next;
while(1)
{
tmp->next = prev;
tmp->prev = next;
prev= tmp;
tmp = next;
if(NULL == tmp)
{
break;
}
next =next->next;
}
list->head = prev;
return 0;
}
char *GetCurrent(DouLinkList *list)
{
return list->currnet->data.pathname;
}
int GetPrev(DouLinkList *list)
{
list->currnet = list->currnet->prev;
if(NULL == list->currnet)
{
list->currnet = list->head;
while(list->currnet->next)
{
list->currnet = list->currnet->next;
}
}
return 0;
}
int Getnext(DouLinkList *list)
{
list->currnet = list->currnet->next;
if(NULL == list->currnet)
{
list->currnet = list->head;
}
return 0;
}
fun.c
cpp
#include "func.h"
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int do_ls(char *path,DouLinkList*dl)
{
{
DIR* dir = opendir(path);
if(NULL == dir)
{
printf("opendir");
return 1;
}
DATATYPE data;
while(1)
{
struct dirent *info = readdir(dir);
//procintf("%s %lu",info->d_name,info->d_ino);
if(NULL == info)
{
break;
}
if(strlen(info->d_name ) >3)// 1.flv /home/linux/1.flv
{
if(0==strcmp(&info->d_name[strlen(info->d_name)-3],"mp3")
||0==strcmp(&info->d_name[strlen(info->d_name)-3],"flv")
||0==strcmp(&info->d_name[strlen(info->d_name)-3],"mp4"))
{
bzero(&data,sizeof(data));
sprintf(data.pathname,"%s/%s",path,info->d_name);
//sprintf(song.songlist[song.total++],"%s/%s",path,info->d_name);
InsertHeadLinkList(dl,&data);
}
}
else
{
continue;
}
}
closedir(dir);
}
dl->currnet = dl->head;
return 0;
}
fun.h
cpp
#ifndef FUNC_H
#define FUNC_H
#include "doulink.h"
int do_ls(char *path,DouLinkList*dl);
#endif // FUNC_H
doulink.h
cpp
#ifndef DOULINK_H
#define DOULINK_H
typedef struct{
char pathname[512];
}DATATYPE;
typedef int (*PFUN)(DATATYPE*data,void* arg);
typedef struct node {
DATATYPE data;
struct node *next,*prev;
}DouLinkNode;
typedef struct{
DouLinkNode *head;
struct node *currnet;
int clen;
}DouLinkList;
typedef enum{DIR_FORWARD,DIR_BACKWARD}DIRECT;
DouLinkList* CreateDouLinkList();
int InsertHeadLinkList(DouLinkList *list, DATATYPE *data);
int ShowDouLinkList(DouLinkList *list,DIRECT direct);
int GetSizeDouLinkList(DouLinkList *list);
DouLinkNode *FindLinkList(DouLinkList *list, PFUN fun,void* arg);
int RevertDouLinkList(DouLinkList *list);
char* GetCurrent(DouLinkList *list);
int GetPrev(DouLinkList *list);
int Getnext(DouLinkList *list);
#endif // DOULINK_H