程序代码：

#include<stdio.h>
struct Student
{
    int num;
    float score;
    struct Student *next;
};

int main()
{
    struct Student a, b, c, *head, *p;
    head = &a;
    a.next = &b;
    b.next = &c;
    c.next = NULL;
    a.num = 10101;
    a.score = 89;
    b.num = 10103;
    b.score = 76;
    c.num = 10107;
    c.score = 66;
    while (p != NULL)
    {
        printf("%d %5.2f\n", p->num, p->score);
        p = p->next;
    }
    return 0;
}