linux静态链表问题，不知道哪里出错了，

Question

#include <stdio.h>struct su{ int price; int atk; struct su *next;};int main(){ struct su a,b,c,*head; a.price=10; a.atk=10; b.price=20; b.atk=20; c.price=30; c.atk=30; head=&a; a.next=&b; b.next=&c; c.next=NULL; struct su *p; p=head; while(p != NULL) { printf("%d,%d\n",p->atk,p->price); p=p->next; } return 0;}