# include <stdio.h>
# include <string.h>

struct Student
{
    char name[10];
    double score;
    Student * next;
};

int main(void)
{
    Student stu1, stu2, stu3, * head, *q;
    strcpy(stu1.name, "Wang");
    strcpy(stu2.name, "Guo");
    strcpy(stu3.name, "Mo");
    stu1.score=66.6, stu2.score=33.3, stu3.score=98.9;
    head=&stu1, stu1.next=&stu2, stu2.next=&stu3, stu3.next=NULL;
    q=head;
    for (;q!=NULL;q=q->next)//如果这里没有“q!=NULL”会怎样？
        printf("%s's score is %.2lf.\n", q->name, q->score);
    printf("\n");

    return 0;
}

链表的结束判断，不写逻辑有问题

会怎样？你会进入一个恐怖的黑洞世界,然后你就吓尿了，然后系统就说：你个小小的屌丝，来这种高富帅区间干什么？滚！
然后就“非法访问内存”了···

搜嘎~生动形象