设计一个酒店管理系统用c语言代码实现功能：登记入住， 结账，查询客房信息， 客房信息打印 ，客房统计 ，退出

好的，以下是一个简单的酒店管理系统的C语言代码实现：

#include <stdio.h>

struct hotel {
    int room_num;
    int occupied; // 0表示空房，1表示已入住
    float rate;
};

void check_in(struct hotel rooms[], int room_num) {
    int i;
    for (i = 0; i < room_num; i++) {
        if (rooms[i].occupied == 0) {
            rooms[i].occupied = 1;
            printf("请输入房间号（1-%d）：", room_num);
            scanf("%d", &rooms[i].room_num);
            printf("请输入房间价格：");
            scanf("%f", &rooms[i].rate);
            printf("登记成功！\n");
            return;
        }
    }
    printf("抱歉，没有空房间！\n");
}

void check_out(struct hotel rooms[], int room_num) {
    int i, room;
    printf("请输入要结账的房间号：");
    scanf("%d", &room);
    for (i = 0; i < room_num; i++) {
        if (rooms[i].room_num == room && rooms[i].occupied == 1) {
            rooms[i].occupied = 0;
            printf("结账成功！\n");
            return;
        }
    }
    printf("该房间未被入住或房间号错误！\n");
}

void print_info(struct hotel rooms[], int room_num) {
    int i;
    for (i = 0; i < room_num; i++) {
        printf("房间号：%d，价格：%.2f，状态：%s\n", rooms[i].room_num, rooms[i].rate, rooms[i].occupied ? "已入住" : "空房");
    }
}

void room_stat(struct hotel rooms[], int room_num) {
    int i, count = 0;
    float total = 0;
    for (i = 0; i < room_num; i++) {
        if (rooms[i].occupied) {
            count++;
            total += rooms[i].rate;
        }
    }
    printf("已入住房间数：%d，入住率：%.2f%%，总收入：%.2f\n", count, (float)count / room_num * 100, total);
}

int main() {
    int choice;
    const int room_num = 10;
    struct hotel rooms[room_num] = { 0 };
    printf("***欢迎使用酒店管理系统***\n");
    while (1) {
        printf("1.登记入住 2.结账 3.查询客房信息 4.客房信息打印 5.客房统计 6.退出\n");
        printf("请输入您的选择：");
        scanf("%d", &choice);
        switch (choice) {
        case 1:
            check_in(rooms, room_num);
            break;
        case 2:
            check_out(rooms, room_num);
            break;
        case 3:
            print_info(rooms, room_num);
            break;
        case 4:
            print_info(rooms, room_num);
            break;
        case 5:
            room_stat(rooms, room_num);
            break;
        case 6:
            printf("谢谢使用，再见！\n");
            return 0;
        default:
            printf("请输入正确的选项！\n");
            break;
        }
    }
    return 0;
}

以上代码实现了一个简单的酒店管理系统，包括登记入住、结账、查询客房信息、客房信息打印、客房统计和退出功能。用户可以根据自己的需求选择相应的功能。