这个错误怎么办,pta报错
```c
#include<stdio.h>
#include<malloc.h>
#include<stdlib.h>
typedef struct cents{
int data;
int len ;
struct cents* next;
}cent,*CENT;
////////////////////////////
CENT creat_list();
void show(CENT p);
CENT add(CENT p,CENT p1);
CENT sort_list(CENT p );
////////////////////////////
int main(void)
{
CENT p1;
CENT p2;
CENT p3;
p1 = creat_list();
p2 = creat_list();
//show(p1);
//show(p2);
p3 = add(p1,p2);
p3 = sort_list(p3);
show(p3);
return 0;
}
///////////////////
CENT creat_list(){
CENT pHead =(CENT)malloc(sizeof(cent));
if(pHead == NULL){
printf("fasle1");
exit(-1);
}
pHead->len = 0;
CENT pTail =(CENT)malloc(sizeof(cent));
pHead = pTail;
while(pTail->data != -1){
CENT pNew = (CENT)malloc(sizeof(cent));
if(pNew==NULL){
printf("´false2");
exit(-1);
}
int s;
scanf("%d",&s);
pNew->data = s;
pTail->next = pNew;
pNew->next = NULL;
pTail = pNew;
pHead->len++;
}
return pHead;
}
void show(CENT p){
CENT pArry = (CENT)malloc(sizeof(cent));
if(pArry == NULL){
printf("false3");
exit(-1);
}
pArry = p->next;
while(pArry->data!=-1){
printf("%d ",pArry->data);
pArry = pArry->next;
}
printf("\n");
}
//////////////
CENT add(CENT p,CENT p1){
CENT pHead = (CENT)malloc(sizeof(cent));
pHead = p;
while(p->next->data!=-1){
p = p->next;
}
p->next = p1->next;
return pHead;
}
CENT sort_list(CENT p ){
CENT pfirst=NULL;
CENT pend=NULL;
pfirst=p->next;
while(pfirst != pend){
while(pfirst->next != pend){
if(pfirst->data >pfirst->next->data){
int temp=pfirst->data;
pfirst->data=pfirst->next->data;
pfirst->next->data=temp;
}
pfirst=pfirst->next;
}
pend=pfirst;
pfirst=p->next;
}
return p->next;
}
```的结果