程序代码：

#include<stdio.h>
#include<stdlib.h>
#define len sizeof(struct student)
struct student
{
    long num;
    float score;
    struct student *next;
};

int n;

struct student *creat(void)
{
    struct student *head;
    struct student *p1, *p2;
    n = 0;
    p1 = p2 = (struct student *)malloc(len);
    scanf_s("%ld%f", &p1->num, &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_s("%ld%f", &p1->num, &p1->score);
    }
    p2->next = NULL;
    return head;
}

struct student *del(struct student *head, long num)
{
    struct student *p1, *p2;
    if (head == NULL)
    {
        printf("\nlist null!\n");
        return head;
    }
    p1 = head;
    while (num != p1->num&&p1->next != NULL)
    {
        p2 = p1;
        p1 = p1->next;
    }
    if (num == p1->num)
    {
        if (p1 == head)
            head = p1->next;
        else
            p2->next = p1->next;
        printf("delete %ld\n", num);
        n = n - 1;
    }
    else
        printf("%ld not been found\n", num);
    return head;
}

void print(struct student *head)
{
    struct student *p;
    printf("\nNow,these %d records are:\n", n);
    p = head;
    if(head!=NULL)
        do
        {
            printf("%ld %5.1f\n", p->num, p->score);
            p = p->next;
        } while (p != NULL);
}

int main()
{
    struct student *creat(void);
    struct student *del(struct student *head, long num);
    void print(struct student *head);
    struct student *head;
    long del_num;
    printf("input records\n");
    head = creat();
    print(head);
    printf("input deleted number:\n");
    scanf_s("%ld", &del_num);
    head = del(head, del_num);
    print(head);
    return 0;
}