链表初学者，编了个东西好多问题，望得到解决
#include <stdio.h>
#include <malloc.h>
#define LEN sizeof(struct student)
#define NULL 0
typedef struct student
{
int num;
char name[];
double score;
struct student *next;
}student;
int menu()
{
int i;
printf( "\n\n1.Insert\t2.Delete\t3.View\t4.select\t5.paixu\t6.quit\nPlease select a number: ");
scanf( "%d ",&i);
return i;
}

struct student *creat(viod)
{struct student *head,*p1,*p2;
int n=0;
p1=p2=(struct student *)malloc(LEN);
scanf( "%d,%c,%f ",&p1-> num,&p1-> name,&p1-> score);
head=NULL;
while(p1-> num!=0)
{n=n+1;
if(n==1)head=p1;
else p2-> next=p1;
p2=p1;
p1=(struct student *)malloc(LEN);
scanf( "%d,%c,%f ",&p1-> num,&p1-> name,&p1-> score);
p2-> next=NULL;
return(head);
}
student *bubblesort(student *head)
{
student *q,*tail,*p=(student*)malloc(LEN);
p-> next = head;
head = p;
tail = NULL;
while(tail != head-> next)
{
p = head;
q =p-> next;
while(q-> next != tail)
{
if (p-> next-> num < q-> next-> num)
{
p-> next = q-> next;
q-> next = q-> next-> next;
p-> next-> next = q;
}
p = p-> next;
q = p-> next;
}
tail = q;
}
p = head-> next;
free(head);
return p;
}
int insert(student *head,int x,char y,float z)
student *p0,*p1,*p2;
s= (student *)malloc(LEN);
s-> num=x;
s-> name=y;
s-> score=z;
p=head;
while(p-> next)
{
if(x < p-> next-> num) break;
else p=p-> next;

}

s-> next=p-> next;
p-> next=s;
return(1);
}
int delete(student *head,int x)
{
int j=0;
student *p;
p=head;

while(p-> next)
{
if(p-> next-> num==x)
{
p-> next=p-> next-> next;
j++;
}
else
p=p-> next;
}
return j;

}
void view(student *head)
{
student *p;
p=head;
while(p-> next)
{
printf( "%d %c %f ",p-> next-> num,p-> next-> name,p-> next-> score);
p=p-> next;
}
}
int select(student *head,char x)
{

student *p;
p=head;

while(p-> next)
{
if(p-> next-> name==x)
{
printf( "%d %c %f ",p-> next-> num,p-> next-> name,p-> next-> score);

}
else
p=p-> next;
};
student *bubblesort1(student *head)
{
student *q,*tail,*p=(student*)malloc(LEN);
p-> next = head;
head = p;
tail = NULL;
while(tail != head-> next)
{
p = head;
q =p-> next;
while(q-> next != tail)
{
if (p-> next-> score < q-> next-> score)
{
p-> next = q-> next;
q-> next = q-> next-> next;
p-> next-> next = q;
}
p = p-> next;
q = p-> next;
}
tail = q;
}
p = head-> next;
free(head);

return p;
}
main()
{
int c,num,d;
char name;
float score;
student *head;
head=creat();
head=bubblesort()

clrscr();
c=menu();
while(c!=6)
{
if(c==1)
{
printf( "\nPlease input the data you want to insert: ");
scanf( "%d%c%f ",&num,&name,&score);
if(insert(head,num,name,score))
printf( "\nInsert OK!! ");
else
printf( "\nInsert Error!! ");
}
else if(c==2)
{
printf( "\nPlease input the number you want to delete: ");
scanf( "%d%c%f ",&num,&name,&score);
d=delete(head,num);

}
else if(c==3)
view(head);
esle if(c==4)
{
printf( "\nPlease input the name you want to select: ") ;
scanf( "%c ",&name);
select(head,name);
else if(c=5)
head=bubblesort1();


}
c=menu();
}
}


[解决办法]
楼主把这程序扔掉重新写一个吧！！！你的编程习惯不好，好的编程习惯是“自顶而下，逐步求精”的！！！！就是你每写一个链的函数，就要进行调试，检查写出的函数是否有问题（可以写个简单的main函数打印出相关变量），比如你写一个初始化链，就要检查一下新建个链后相关变量的输出有没有错误。初学的时候别写这么长的代码。。。写个简单的容易掌握住链的特点也不容易出错，我们数据结构老师写的代码都没你这个长。。。。。。