从键盘输入若干正整数为这些正整数建立一条升序链当输入的数是-1时结束链的建立并输出链表中的所有的数据

VC环境下程序：
#include <stdio.h>
#include<stdlib.h>
typedef struct list
{
int data;
struct list *next;
}LIST;
void main()
{
LIST *head,*p,*q,*In;
int i,j=1;
head=p=q=In=NULL;
printf("Input the %d number:",j++);
scanf("%d",&i);
while(i!=-1)
{
if(head==NULL)
{
head=(LIST*)malloc(sizeof(LIST));
q=(LIST*)malloc(sizeof(LIST));
q->data=i;
q->next=NULL;
head->next=q;
p=head->next;
}
else
{
In=head;
while(p!=NULL&&p->data<i)
{
In=p;
p=p->next;
}
q=(LIST*)malloc(sizeof(LIST));
q->data=i;
q->next=In->next;
In->next=q;
p=head->next;
}
printf("Input the %d number:",j++);
scanf("%d",&i);
}
p=head->next;
while(p!=