麻烦下帮我看一下这个程序错在哪里了？？？多谢谢！！！
#include"stdio.h"#include"stdlib.h"
#define LEN sizeof(struct Student)
struct Student
{
long num;
char name[20];
char sex[5];
int old;
struct Student *next;
};
int n;
struct Student *creat(void)
{
struct Student *head,*p1,*p2;
p1=p2=(struct Student *)malloc(LEN);
printf("输入学生的信息（学号(学号为零就结束)，姓名，性别（man or woman），年龄）：");
scanf("%ld,%s,%s,%d",&p1->num,p1->name,p1->sex,&p1->old);
head=NULL;
while(p1->num!=0)
{
n++;
if(n==1)head=p1;
else p2->next=p1;
p2=p1;
p1=malloc(LEN);
printf("输入学生的信息（学号，姓名，性别(man or woman)，年龄）：");
scanf("%ld,%s,%s,%d",&p1->num,p1->name,p1->sex,&p1->old);
}
p2->next=NULL;
return head;
}
struct Student *del(struct Student *head,int old)
{
struct Student *p1,*p2;
int i=1;
p1=head;
if(head==NULL)
{
printf("\nlist null!\n");goto end;
}
while(i==1)
{
while(old!=p1->old&&p1->next!=NULL)
{
p2=p1;p1=p1->next;
}
if(old==p1->old)
{
if(p1==head)head=p1->next;
else p2->next=p1->next;
i=1;
}
else {printf("%d not been found!\n",old);i=0;}
}
return head;
}
void print(struct Student *head)
{
struct Student *p;
printf("\nnow these %d records are:\n",n);
p=head;
if(head!=NULL)
do
{
printf("%ld,%s,%s,%d",p1->num,p1->name,p1->sex,p1->old);
p=p->next;
}while(p!=NULL);
}
int main(void)
{
int old;
struct Student *head;
head=creat();
printf("输入一个年龄：");
scanf("%d",&old);
head=del(head,old);
print(head);
return 0;
}
