#include "stdio.h"?struct student? ? {? ? long num;? ? float score;? ? struct student * next;? ? };void main(){? ? struct student stu1,stu2,stu3;? ? struct student * head,*p;? ??? ? stu1.num=1;? ? stu2.num=2;? ? stu3.num=3;? ? head=&stu1;? ? stu1.next=&stu2;? ? stu2.next=&stu3;? ? stu3.next=NULL;? ??? ? //p=head不用p不是也可以嗎，p有什么用? ??? ? while(head!=NULL){? ? printf("%d\n",head->num);? ? head=head->next;? ? }? ?}