一元多项式求和问题没报错却运行不了（我是萌新）

春江花月夜55

#include<stdio.h>
#include<malloc.h>
typedef struct Polynode
{int coef;
int exe;
struct Polynode *next;
}Polynode,*Linklist;

void CreatePoly(Linklist *p);
void PrintPoly(Linklist p);
Linklist AddPoly(Linklist pa,Linklist pb);

int main()
{Linklist p1,p2;
printf("请输入第一个多项式的系数和指数\n");
p1=CreatePoly(&p1);
PrintPoly(p1);
printf("请输入第二个多项式的系数和指数\n");
p2=CreatePoly(&p2);
PrintPoly(p2);
PrintPoly(AddPoly(p1,p2));
return 0;
}

void CreatePoly(Linklist *p)
{Linklist r,s;
int c,e;
int flag=1;
*p=(Linklist)malloc(sizeof(Polynode));
r=*p;
while(flag)
  { scanf("%d,%d",&c,&e);
    if(c!=0)
    {s=(Linklist)malloc(sizeof(Polynode));
     s->coef=c;
     s->exe=e;
     r->next=s;
     r=s;
        }
        else
        flag=0;
  }
r->next=NULL;
return p;
}

void PrintPoly(Linklist p)
{Linklist s;
s=p->next;
while(s!=NULL)
  {printf("%d x^%d",s->coef,s->exe);
   s=s->next;
  }
  printf("\n");
  getchar();
}

Linklist AddPoly(Linklist pa,Linklist pb)
{Linklist newp,p,q,s,pc;
int sum;
p=pa->next;
q=pb->next;
newp=(Linklist)malloc(sizeof(Polynode));
pc=newp;
while(p&&q)
{
if(p->exe<q->exe)
  {s=(Linklist)malloc(sizeof(Polynode));
   s->coef=p->coef;
   s->exe=p->exe;
   pc->next=s;
   pc=s;
   p=p->next;
  }
else if(p->exe==q->exe)
  {sum=p->exe+q->exe;
    if(sum!=0)
     {s->coef=sum;
      s->exe=p->exe;
      pc->next=s;
      pc=s;
         }
        p=p->next;
        q=q->next;
  }
else
  {s=(Linklist)malloc(sizeof(Polynode));
   s->coef=q->coef;
   s->exe=q->exe;
   pc->next=s;
   pc=s;
   q=q->next;
  }
}
  while(p)
  {s=(Linklist)malloc(sizeof(Polynode));
   s->coef=p->coef;
   s->exe=p->exe;
   pc->next=s;
   pc=s;
   p=p->next;
  }
  while(q)
  {s=(Linklist)malloc(sizeof(Polynode));
   s->coef=q->coef;
   s->exe=q->exe;
   pc->next=s;
   pc=s;
   q=q->next;
  }
  pc->next=NULL;
  return newp;
}