用c语言为5个学生信息建立动态链表，每个学生包括学号、姓名和分数 3种信息（要求这些信息能从文件中导入），输入一个学号值删除列表中该学号的学生节点。

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

// 定义学生结构体
struct student {
    int num;
    char name[20];
    int score;
    struct student *next;
};

// 从文件中读取学生信息并创建链表
struct student *create_list(void) {
    struct student *head, *p, *tail;
    head = (struct student *)malloc(sizeof(struct student));
    tail = head;
    FILE *fp;
    fp = fopen("students.txt", "r");
    if (fp == NULL) {
        printf("Cannot open file!\n");
        exit(1);
    }
    while (!feof(fp)) {
        p = (struct student *)malloc(sizeof(struct student));
        fscanf(fp, "%d %s %d", &p->num, p->name, &p->score);
        p->next = NULL;
        tail->next = p;
        tail = p;
    }
    fclose(fp);
    return head;
}

// 遍历链表，并打印出每个学生的信息
void print_list(struct student *head) {
    struct student *p = head->next;
    while (p != NULL) {
        printf("%d %s %d\n", p->num, p->name, p->score);
        p = p->next;
    }
}

// 删除学号为num的学生节点
void delete_node(struct student *head, int num) {
    struct student *p = head->next;
    struct student *prev = head;
    while (p != NULL) {
        if (p->num == num) {
            prev->next = p->next;
            free(p);
            printf("Student %d has been deleted!\n", num);
            return;
        }
        prev = p;
        p = p->next;
    }
    printf("Student %d not found!\n", num);
}

int main() {
    struct student *head = create_list();
    printf("Original list:\n");
    print_list(head);
    int num;
    printf("Please enter the student number you want to delete: ");
    scanf("%d", &num);
    delete_node(head, num);
    printf("New list:\n");
    print_list(head);
    return 0;
}