双向链表

#include<stdio.h>
#include<malloc.h>

#define ERROR 0
#define OK 1
#define EQUAL 1
#define OVERFLOW -1
#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10

struct STU{
char name[20];
char stuno[10];
int age;
int score;
}stu[50];
typedef struct STU ElemType;

struct LNODE
{
ElemType data;
struct LNODE *prior;
struct LNODE *next;
};

typedef struct LNODE LNode;
typedef struct LNODE *LinkList;

/*初始化链表L*/
int init(LinkList *L)
{
*L=(LNode *)malloc(sizeof(LNode));
if(!L) exit(ERROR);
(*L)->next=NULL;
(*L)->prior=NULL;
return OK;
}/*init */

/*返回链表长度*/
int ListLength(LinkList L)
{
int j=0;
while (L->next)
{
L=L->next;
j++;
}
return j;
}

/*获得链表L的第i个元素,并赋值给指针e*/
int GetElem(LinkList L,int i,ElemType *e)
{
LinkList p; int j;
p=L->next;j=1;
while(p&&j<i){
p=p->next;++j;
}
if(!p||j>1) return ERROR;
*e=p->data;
return OK;
}

/*判断e1与e2两元素是否相等*/
int EqualList(ElemType *e1,ElemType *e2)
{
if (strcmp(e1->name,e2->name)==0)
return 1;
else
return 0;
}

/*比较元素e1与e2*/
int Less_EqualList(ElemType *e1,ElemType *e2)
{
if (strcmp(e1->name,e2->name)<=0)
return 1;
else
return 0;
}

/*从线性链表L中删除第i个元素*/
int DeleteElem(LinkList L,int i)
{
LinkList p; int j;
j=0;
p=L;
while (p->next && j<i){
p=p->next; ++j;
}
if(!p) return ERROR;
p->prior->next=p->next;
p->next->prior=p->prior;
free(p);
return OK;
}

/*元素e是否在链表La中*/
int LocateElem(LinkList La,ElemType e,int type)
{
int i;
LinkList p;
p=La;
switch (type)
{
case EQUAL:
while(p->next)
{
p=p->next;
if(EqualList(&p->data,&e))
return 1;
}
return 0;
break;
default:
break;
}
return 0;
}

void MergeList(LinkList La,LinkList Lb,LinkList *Lc)
{
LinkList pa,pb,pc;
pa=La->next;pb=Lb->next;
*Lc=pc=La;
while(pa && pb)
{
if(Less_EqualList(&pa->data,&pb->data))
{
pc->next=pa;pa->prior=pc;pc=pa;pa=pa->next;
}
else
{
pc->next=pb;pb->prior=pc;pc=pb;pb=pb->next;
}
}
pc->next=pa?pa:pb;
free(Lb);
}

int printlist(LinkList L)
{
int i;
LinkList p;
p=L;
printf("name stuno age score\n");
while(p->next)
{
p=p->next;
printf("%-10s %s\t%d\t%d\n", p->data.name, p->data.stuno,
p->data.age, p->data.score);
}
printf("\n");
}

int ListInsert(LinkList L,int i,ElemType e)
{
LinkList p,s;
int j;
p=L;j=0;
while(p&&j<i-1)
{
p=p->next;
++j;
}
if(!p||j>i-1) return ERROR;
s=(LinkList)malloc(sizeof(LNode));
s->data=e;
s->next=p->next;
s->prior=p;
p->next=s;
return OK;
}/*ListInsert Before i */

int main()
{
struct STU e,t,*p;
LinkList La,Lb,Lc;

printf("\n\n-------------------List Demo is running...----------------\n\n");
printf("First is InsertList function.\n");
init(&La);

strcpy(e.name,"stu1");
strcpy(e.stuno,"100001");
e.age=80;
e.score=1000;
ListInsert(La,1,e);
strcpy(e.name,"stu3");
strcpy(e.stuno,"100002");
e.age=80;
e.score=1000;
ListInsert(La,2,e);

printlist(La);
getch();

strcpy(e.name,"stu5");
strcpy(e.stuno,"100003");
e.age=80;
e.score=1000;
ListInsert(La,3,e);

printlist(La);
getch();

printf("Test DeleteElem\n");
DeleteElem(La,1);
printlist(La);
getch();

init(&Lb);

strcpy(e.name,"stu2");
strcpy(e.stuno,"100001");
e.age=80;
e.score=1000;
ListInsert(Lb,1,e);
strcpy(e.name,"stu4");
strcpy(e.stuno,"100002");
e.age=80;
e.score=1000;
ListInsert(Lb,2,e);

strcpy(e.name,"stu6");
strcpy(e.stuno,"100001");
e.age=80;
e.score=1000;
ListInsert(Lb,3,e);

printlist(Lb);
getch();

MergeList(La,Lb,&Lc);
printlist(Lc);
getch();

printf("\n\n\n\n\n\nWelcome to visit http://zmofun.heha.net !\n\n\n\n\n\n\n");
getch();
return 0;
}