실험 이선형 표의 체인식 표시와 실현

#include<stdio.h>
#include<stdlib.h>
typedef int elemtype;
typedef struct node
{
 elemtype data;
 struct node *next;
}node;
struct node *head;
int n;
void bulid1()//   
{
 struct node *p,*q;
 q=head;
 int i;
 for (i=1;i<=n;i++)
 {
  p=(struct node*)malloc(sizeof(struct node));
  scanf("%d",&p->data);
  q->next=p;
  p->next=NULL;
  q=p;
 }
}
void bulid2()//   
{
 struct node *p;
 int i;
 for (i=1;i<=n;i++)
 {
  p=(struct node*)malloc(sizeof(struct node));
  scanf("%d",&p->data);
  p->next=head->next; 
  head->next=p;
 }
}
void insert(int num,int pos)
{
 int i;
 struct node *p,*q;
 q=head;
 for (i=1;i<=pos;i++)
 q=q->next;
 p=(struct node*)malloc(sizeof(struct node));
 p->data=num;
 p->next=q->next;
 q->next=p;

}
void Delete(int pos)
{
 int i;
 struct node *q,*p;
 q=head;
 for (i=1;i<pos;i++)
 q=q->next;
 p=q->next->next;
 q->next=p;
}
int  find(int key)
{
 struct node *p=head;
 int i=0;
 while (head->data!=key)
 {
  head=head->next;
  ++i;
  if (head->next==NULL) {i=-1; break;}
 }
 return i;
}
void output()
{
 struct node *h=head;
 h=h->next;
 while (h->next!=NULL)
 {
  printf("%d ",h->data);
  h=h->next;
 }
 printf("%d
",h->data);
}
int main()
{
 
 int num,pos;
 head=(struct node*)malloc(sizeof(struct node));
 head->next=NULL;
 scanf("%d",&n);
 bulid1();
 output();
 
 scanf("%d%d",&num,&pos);
 insert(num,pos);
 output();
  
 scanf("%d",&pos);
 Delete(pos);
 output();
 
 scanf("%d",&num);
 printf("%d",find(num));
 head=(struct node*)malloc(sizeof(struct node));
 head->next=NULL;
 scanf("%d",&n);
 bulid2();
 output();
 return 0;
}