为什么我写的多项式相乘没有结果出来，求解！

#include<stdio.h>
#include<malloc.h>
typedef struct Polynode
{
	int coef;
	int exf;
	struct Polynode *next;
}*Polylist;

void Init(Polylist *l)//初始化链表
{
	*l =(Polylist)malloc(sizeof(Polynode));
	(*l)->next = NULL;
}
void Creat(Polylist l)//用尾插法存入多项式的系数和指数
{
	Polynode *r,*s;
	r = l;
	int c,e;
	scanf("%d%d",&c,&e);
	while(c != 0)
	{
		s = (Polynode*)malloc(sizeof(Polynode));
		s->coef = c;
		s->exf = e;
		s->next = NULL;
		r->next = s;
		r = s;
		scanf("%d%d",&c,&e);
	}
}
Polylist Polyadd(Polylist la,Polylist lb)//两个多项式la、lb之和，结果存入多项式la中
{
	Polynode *p,*q,*tail,*temp;
	int sum;
	p=la->next;
	q=lb->next;
	tail=la;
	while(p!=NULL&&q!=NULL)
	{
		if(p->exf<q->exf)
		{
			tail->next=p;
			tail=p;
			p=p->next;
		}
		else if(p->exf==q->exf)
		{
			sum=p->coef+q->coef;
			if(sum!=0)
			{
				p->coef=sum;
				tail->next=p;
				tail=p;
				p=p->next;
				temp=q;
				q=q->next;
				free(temp);
			}
			else
			{
				temp=p;
				p=p->next;
				free(temp);
				temp=q;
				q=q->next;
				free(temp);
			}
		}
		else
		{
			tail->next=q;
			tail=q;
			q=q->next;
		}
	}
	if(p!=NULL)
		tail->next=p;
	else
		tail->next=q;
	return la;
}
Polylist Polylistdanmult(Polylist la,int coef,int exf)//单项式乘多项式
{
	Polynode *s;
	s=la->next;
	while(s!=NULL)
	{
		s->coef=s->coef*coef;
		s->exf=s->exf+exf;
		s=s->next;
	}
	return la;
}
void Printf(Polylist l)//输出多项式的系数及指数
{
	Polynode *p = l->next;
	while(p != NULL)
	{
		printf("%d %d ", p->coef, p->exf);
		p = p->next;
	}
	printf("\n");
}
Polylist Polylistduomult(Polylist la,Polylist lb)//多项式相乘
{
	Polylist result,temp;
	Init(&result);Init(&temp);
	result->next=NULL;
	Polynode *p,*q;
	int c,e;
	p=la->next;
	q=lb->next;
	c=p->coef;
	e=p->exf;
	while(p!=NULL)
	{
		temp=Polylistdanmult(lb,c,e);
		result=(temp,result);
		p=p->next;
		c=p->coef;
		e=p->exf;
	}
	return result;
}
int main()
{
	Polylist la,lb,lc;
	Init(&la);Init(&lb);Init(&lc);
	Creat(la);Creat(lb);
	lc=Polylistduomult(la,lb);
	Printf(lc);
	return 0;
}