链表的输出我感觉是没有问题但就是运行不出来

Question

#include<stdio.h>
#include<stdlib.h>
typedef struct student
{
	int score;
	struct student *next;
}Linklist;
Linklist *creat(int n);//输入函数
void newprintf(Linklist *head);
void Pfree(Linklist *head);
int main()
{
	int n=15;
	Linklist *head;
	head=creat(n);
	newprintf(head);
	Pfree(head);
	system("pause");
	return 0;
}
Linklist *creat(int n)
{
	Linklist *head = NULL,*node,*p;
//	for(int i=0;i<n;i++)
	while(p->score!=1)
	{
		node=(Linklist *)malloc(sizeof(Linklist));
		//scanf("%d",&node->score);
		
		node->next = NULL;
		if(head == NULL)
		{
			node->score=n;
			head = node;
			head->next = NULL;
			p = head;
		}
		else
		{
			if(n%2==0)
				node->score=n/2;
			else
				node->score=3*n+1;
			n=node->score;
			p->next = node;
			p = node;
		}
	}
	p->next=NULL;
	return head;
}
void newprintf(Linklist *head)
{
	Linklist *p = head;
	if(p==NULL)
	{
		printf("此链表为空\n");
		return;
	}
	while(p!=NULL)
	{
		printf("我是%d\n",p->score);
		p=p->next;
	}
}
void Pfree(Linklist *head)
{
	Linklist *p = head;
	while(p!=NULL)
	{
		p=head->next;
		free(head);
		head=p;
	}
}

问题在哪

Answer 1

Linklist *creat(int n)//创造链表
{
	Linklist *head=NULL,*node,*end;
	end=(Linklist *)malloc(sizeof(Linklist));
	end->next=NULL;
	end->score=0;
	for(int i=0;end->score!=1;i++)
	{
		node=(Linklist *)malloc(sizeof(Linklist));
		//scanf("%d",&node->score);
		node->next=NULL;
		if(head==NULL)
		{
			node->score=n;
			head=node;
			head->next=NULL;
			end=head;
		}
		else
		{
			if(n%2==0)
				node->score=n/2;
			else
				node->score=3*n+1;
			n=node->score;
			end->next=node;
			end=node;
		}
	}
	end->next=NULL;
	return head;
}