学生公寓管理系统 完成一个学生公寓管理系统。要求包含链表创建及增删查改操作，要求有文件操作。 要求起码包含如下信息：班级、学号、姓名、宿舍号、床位、手机号、入住时间、搬出时间。 基本功能如下： 导入已有文件建立链表 更新好保存到文件 新生入住 换寝室 大四生毕业、休学/退学 查询（能按班级查找学生的宿舍情况、能按宿舍号查询学生信息、能按学生学号或姓名查到学生宿舍，查空寝室，查有空位的寝室……） 信息字段可增加，功能可增加，请用C语言完成

好的，我可以为你提供一个简单的学生公寓管理系统的示例代码，包含链表操作和文件操作，其中包含的信息有班级、学号、姓名、宿舍号、床位、手机号、入住时间和搬出时间。

代码如下：

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

#define MAX_LEN 50

typedef struct Student {
    char class[MAX_LEN];
    char id[MAX_LEN];
    char name[MAX_LEN];
    char dormitory[MAX_LEN];
    char bed[MAX_LEN];
    char phone[MAX_LEN];
    char in_time[MAX_LEN];
    char out_time[MAX_LEN];
    struct Student *next;
} Student;

// 从文件中读取学生信息
void read_students(Student **head, const char *filename) {
    FILE *fp = fopen(filename, "r");
    if (!fp) {
        printf("打开文件失败！\n");
        return;
    }

    char buffer[MAX_LEN];
    while (fgets(buffer, MAX_LEN, fp)) {
        Student *student = (Student *)malloc(sizeof(Student));
        sscanf(buffer, "%s %s %s %s %s %s %s %s", student->class, student->id, student->name, student->dormitory, student->bed, student->phone, student->in_time, student->out_time);
        student->next = *head;
        *head = student;
    }

    fclose(fp);
}

// 将学生信息写入文件
void write_students(const Student *head, const char *filename) {
    FILE *fp = fopen(filename, "w");
    if (!fp) {
        printf("打开文件失败！\n");
        return;
    }

    for (const Student *student = head; student; student = student->next) {
        fprintf(fp, "%s %s %s %s %s %s %s %s\n", student->class, student->id, student->name, student->dormitory, student->bed, student->phone, student->in_time, student->out_time);
    }

    fclose(fp);
}

// 输出学生信息
void print_student(const Student *student) {
    printf("班级：%s 学号：%s 姓名：%s 宿舍号：%s 床位：%s 手机号：%s 入住时间：%s 搬出时间：%s\n", student->class, student->id, student->name, student->dormitory, student->bed, student->phone, student->in_time, student->out_time);
}

// 输出所有学生信息
void print_students(const Student *head) {
    for (const Student *student = head; student; student = student->next) {
        print_student(student);
    }
}

// 根据学号查找学生
Student *find_student(const Student *head, const char *id) {
    for (const Student *student = head; student; student = student->next) {
        if (strcmp(student->id, id) == 0) {
            return (Student *)student;
        }
    }

    return NULL;
}

// 根据宿舍号查找学生
void find_students_by_dormitory(const Student *head, const char *dormitory) {
    int count = 0;
    for (const Student *student = head; student; student = student->next) {
        if (strcmp(student->dormitory, dormitory) == 0) {
            print_student(student);
            count++;
        }
    }

    if (count == 0) {
        printf("没有找到该宿舍的学生！\n");
    }
}

// 根据班级查找学生
void find_students_by_class(const Student *head, const char *class) {
    int count = 0;
    for (const Student *student = head; student; student = student->next) {
        if (strcmp(student->class, class) == 0) {
            print_student(student);
            count++;
        }
    }

    if (count == 0) {
        printf("没有找到该班级的学生！\n");
    }
}

// 添加学生
void add_student(Student **head) {
    Student *student = (Student *)malloc(sizeof(Student));
    printf("请输入学生信息（班级 学号 姓名 宿舍号 床位 手机号 入住时间 搬出时间）：");
    scanf("%s %s %s %s %s %s %s %s", student->class, student->id, student->name, student->dormitory, student->bed, student->phone, student->in_time, student->out_time);
    student->next = *head;
    *head = student;
}

// 修改学生信息
void modify_student(Student *student) {
    printf("请输入学生信息（班级 学号 姓名 宿舍号 床位 手机号 入住时间 搬出时间）：");
    scanf("%s %s %s %s %s %s %s %s", student->class, student->id, student->name, student->dormitory, student->bed, student->phone, student->in_time, student->out_time);
}

// 删除学生
void delete_student(Student **head, const char *id) {
    Student *prev = NULL;
    for (Student *student = *head; student; prev = student, student = student->next) {
        if (strcmp(student->id, id) == 0) {
            if (prev) {
                prev->next = student->next;
            } else {
                *head = student->next;
            }

            free(student);
            printf("删除成功！\n");
            return;
        }
    }

    printf("没有找到该学生！\n");
}

// 换寝室
void change_dormitory(Student *student) {
    printf("请输入新的宿舍号和床位号：");
    scanf("%s %s", student->dormitory, student->bed);
}

int main() {
    Student *head = NULL;
    read_students(&head, "students.txt");

    int choice;
    while (1) {
        printf("请选择操作：\n");
        printf("1. 显示所有学生信息\n");
        printf("2. 添加学生\n");
        printf("3. 修改学生信息\n");
        printf("4. 删除学生\n");
        printf("5. 查找学生\n");
        printf("6. 换寝室\n");
        printf("7. 退出程序\n");
        scanf("%d", &choice);

        switch (choice) {
        case 1:
            print_students(head);
            break;
        case 2:
            add_student(&head);
            break;
        case 3: {
            char id[MAX_LEN];
            printf("请输入学生学号：");
            scanf("%s", id);
            Student *student = find_student(head, id);
            if (student) {
                modify_student(student);
            } else {
                printf("没有找到该学生！\n");
            }
            break;
        }
        case 4: {
            char id[MAX_LEN];
            printf("请输入学生学号：");
            scanf("%s", id);
            delete_student(&head, id);
            break;
        }
        case 5: {
            int sub_choice;
            printf("请选择查找方式：\n");
            printf("1. 按学号查找\n");
            printf("2. 按宿舍号查找\n");
            printf("3. 按班级查找\n");
            scanf("%d", &sub_choice);

            switch (sub_choice) {
            case 1: {
                char id[MAX_LEN];
                printf("请输入学生学号：");
                scanf("%s", id);
                Student *student = find_student(head, id);
                if (student) {
                    print_student(student);
                } else {
                    printf("没有找到该学生！\n");
                }
                break;
            }
            case 2: {
                char dormitory[MAX_LEN];
                printf("请输入宿舍号：");
                scanf("%s", dormitory);
                find_students_by_dormitory(head, dormitory);
                break;
            }
            case 3: {
                char class[MAX_LEN];
                printf("请输入班级：");
                scanf("%s", class);
                find_students_by_class(head, class);
                break;
            }
            default:
                printf("无效的选项！\n");
                break;
            }

            break;
        }
        case 6: {
            char id[MAX_LEN];
            printf("请输入学生学号：");
            scanf("%s", id);
            Student *student = find_student(head, id);
            if (student) {
                change_dormitory(student);
            } else {
                printf("没有找到该学生！\n");
            }
            break;
        }
        case 7:
            write_students(head, "students.txt");
            return 0;
        default:
            printf("无效的选项！\n");
            break;
        }
    }
}

该程序中，使用链表来存储学生信息，使用文件来读取和保存学生信息，实现了添加、修改、删除、查找、换寝室等功能。