数据结构-单链表

#include<stdio.h>            
#include<stdlib.h>            
#define flag 0            
typedef struct node            
{            
int data;            
struct node *next;            
} LNode,*LinkList;            
LinkList InitLinkList()            
{            
LinkList L;            
LNode *s;            
int x;            
L->data=NULL;            
L->next=NULL;            
scanf("%d",&amp;x);            
while(x!=flag)            
{            
s=(LNode*)malloc(sizeof(LNode));            
s->data=x;            
s->next=L;            
L=s;            
scanf("%d",&amp;x);            
}            
return L;            
}            
void DispLinkList(LinkList L)            
{            
LNode *p=L;            
while(p->next!=NULL)            
{            
printf("%5d",p->data);            
p=p->next;            
}            
printf("\n");            
           
}            
LNode *LocLinkList(LinkList L,int pos)            
{            
LNode *p=L;            
int j=0;            
while(p->next&amp;&amp;j<pos)            
{p=p->next;            
j++;            
}            
if(j==pos)            
return p;            
else           
return NULL;            
}            
int InsLinkList(LinkList L,int pos,int e)            
{            
LNode *p=L,*s;            
p=LocLinkList(L,pos-1);            
if(p==NULL)            
{            
printf("haha,error");            
return 0;            
}            
else           
{            
s=(LNode*)malloc(sizeof(LNode));            
s->data=e;            
s->next=p->next;            
p->next=s;            
return 1;            
}            
}            
int DelLinkList(LinkList L,int pos)            
{            
LinkList p,s;            
p=LocLinkList(L,pos-1);            
if(p==NULL)            
{printf("there is no data");            
return -1;            
}            
else           
if (p->next==NULL)            
{printf("there is no data");            
return 0;            
}            
else           
{            
s=p->next;            
p->next=s->next;            
free(s);            
}            
return 1;            
}            
void menu()            
{            
printf("0----exit\n");            
printf("1----locate\n");            
printf("2----insert\n");            
printf("3----delete\n");            
}            
           
void main()            
{            
LinkList head;            
LNode *temp;            
int MenuNumber;            
int pos,e;            
printf("please input the initData:\n");            
head=InitLinkList();            
DispLinkList(head);            
menu();            
scanf("%d",&amp;MenuNumber);            
while (MenuNumber!=0)            
{            
switch(MenuNumber)            
{            
case 1:            
printf("please input what you want to locate:\n");            
scanf("%d",&amp;pos);            
temp=LocLinkList(head,pos);            
printf("%d\n",temp->data);            
break;            
case 2:            
printf("please input what you want to insert:\n");            
scanf("%d%d",&amp;pos,&amp;e);            
InsLinkList(head,pos,e);            
DispLinkList(head);            
break;            
case 3:            
printf("please input what you want to delete:\n");            
scanf("%d",&amp;pos);            
DelLinkList(head,pos);            
DispLinkList(head);            
break;            
default:printf("error,^^^\n");            
}            
scanf("%d",&amp;MenuNumber);            
}            
}