单链表的基本操作

#include<stdio.h>
#include<malloc.h>
typedef int ElemType;
typedef struct LNode{
    ElemType data;
    struct LNode*  Next;
}LNode,* LinkList;

LinkList creat_list1(LinkList p){
     p=(LNode *)malloc(sizeof(LNode));
    LNode * s;
    int x;
    p->Next=NULL;
    scanf("%d",&x);
    while(x!=9999){
    s=(LNode *)malloc(sizeof(LNode));
    s->data=x;
    s->Next=p->Next;
    p->Next=s;
    scanf("%d",&x);
    }
    return p;
}

LinkList creat_list2(LinkList p){
    int x;
    p=(LNode *)malloc(sizeof(LNode));
    LNode * s,* r=p;
    scanf("%d",&x);
    while(x!=9999){
        s=(LNode *)malloc(sizeof(LNode));
        s->data=x;
        r->Next=s;
        r=s;
        scanf("%d",&x);
    }
    r->Next=NULL;
    return p;
}

void traverse_list(LinkList p){
    p=p->Next;
    while(p!=NULL){
        printf("%d\n",p->data);
        p=p->Next;
    }
}

LinkList getElem(LinkList L,int i){
    int j=1;
    LNode * p=L->Next;
    if(i==0){
        return L;
    }
    if(i<1){
        return NULL;
    }
    while(p!=NULL&&j<i){
        p=p->Next;
        j++;
    }
    return p;
}

LinkList locateElem(LinkList L,ElemType e){
    LNode * p=L->Next;
    while(p&&p->data!=e){
        p=p->Next;
    }
        return p;
}

LinkList insert(LinkList L,int i){
    LNode * s=(LNode *)malloc(sizeof(LNode));
    s->data=99;
    LNode * p=getElem(L,i-1);
    s->Next=p->Next;
    p->Next=s;
    return L;
}

LinkList delet(LinkList L,int i){
    LNode * p=getElem(L,i-1);
    LNode * q=p->Next;
    p->Next=q->Next;
    free(q);
    return L;
}
int size(LinkList L){
    int i=0;
    LinkList p=L->Next;
    while(p)
    {
        p=p->Next;
        i++;
    }
    return i;
}

void main(){
    LinkList head=NULL;
    head=creat_list2(head);
    traverse_list(head);
/*    int i=3;
    LinkList p=getElem(head,i);
    printf("第%d个元素是%d\n",i,p->data);
    p=locateElem(head,3);
    printf("%d",p->data);
*/
    LinkList p=insert(head,2);
    traverse_list(head);

    p=delet(head,2);
    traverse_list(head);

    printf("长度为%d\n",size(head));
}