c语言酒店管理系统代码：登记入住信息，查询客房类型，查询客房信息 ，修改客房信息，删除客房信息，办理退房，退出系统

好的，以下是一个简单的酒店管理系统的 C 语言代码实现，包括登记入住信息，查询客房类型，查询客房信息，修改客房信息，删除客房信息，办理退房和退出系统功能：

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

#define MAX_ROOMS 100

struct room {
    int room_num;
    char room_type[20];
    float price;
    int occupied;
};

struct guest {
    char name[20];
    int room_num;
};

struct room rooms[MAX_ROOMS];
struct guest guests[MAX_ROOMS];
int num_rooms = 0, num_guests = 0;

void load_data();
void save_data();
void check_in();
void check_out();
void display_room_types();
void display_room_info();
void modify_room_info();
void delete_room();

int main() {
    int choice;
    load_data();
    do {
        printf("1. 登记入住信息\n");
        printf("2. 办理退房\n");
        printf("3. 查询客房类型\n");
        printf("4. 查询客房信息\n");
        printf("5. 修改客房信息\n");
        printf("6. 删除客房信息\n");
        printf("7. 退出系统\n");
        printf("请选择您要进行的操作：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                check_in();
                break;
            case 2:
                check_out();
                break;
            case 3:
                display_room_types();
                break;
            case 4:
                display_room_info();
                break;
            case 5:
                modify_room_info();
                break;
            case 6:
                delete_room();
                break;
            case 7:
                save_data();
                break;
            default:
                printf("输入有误，请重新输入。\n");
        }
    } while (choice != 7);
    return 0;
}

void load_data() {
    FILE *fp = fopen("data.txt", "r");
    if (fp == NULL) {
        printf("无法打开数据文件。\n");
        return;
    }
    fscanf(fp, "%d", &num_rooms);
    for (int i = 0; i < num_rooms; i++) {
        struct room r;
        fscanf(fp, "%d %s %f %d", &r.room_num, r.room_type, &r.price, &r.occupied);
        rooms[i] = r;
    }
    fscanf(fp, "%d", &num_guests);
    for (int i = 0; i < num_guests; i++) {
        struct guest g;
        fscanf(fp, "%s %d", g.name, &g.room_num);
        guests[i] = g;
    }
    fclose(fp);
}

void save_data() {
    FILE *fp = fopen("data.txt", "w");
    if (fp == NULL) {
        printf("无法打开数据文件。\n");
        return;
    }
    fprintf(fp, "%d\n", num_rooms);
    for (int i = 0; i < num_rooms; i++) {
        fprintf(fp, "%d %s %f %d\n", rooms[i].room_num, rooms[i].room_type, rooms[i].price, rooms[i].occupied);
    }
    fprintf(fp, "%d\n", num_guests);
    for (int i = 0; i < num_guests; i++) {
        fprintf(fp, "%s %d\n", guests[i].name, guests[i].room_num);
    }
    fclose(fp);
}

void check_in() {
    int room_num;
    printf("请输入您要入住的客房号：");
    scanf("%d", &room_num);
    int room_index = -1;
    for (int i = 0; i < num_rooms; i++) {
        if (rooms[i].room_num == room_num) {
            room_index = i;
            break;
        }
    }
    if (room_index == -1) {
        printf("客房号不存在。\n");
        return;
    }
    if (rooms[room_index].occupied) {
        printf("该客房已被占用。\n");
        return;
    }
    rooms[room_index].occupied = 1;
    printf("请输入您的姓名：");
    scanf("%s", guests[num_guests].name);
    guests[num_guests].room_num = room_num;
    num_guests++;
    printf("登记成功。\n");
}

void check_out() {
    int room_num;
    printf("请输入您要退房的客房号：");
    scanf("%d", &room_num);
    int room_index = -1, guest_index = -1;
    for (int i = 0; i < num_rooms; i++) {
        if (rooms[i].room_num == room_num) {
            room_index = i;
            break;
        }
    }
    if (room_index == -1) {
        printf("客房号不存在。\n");
        return;
    }
    if (!rooms[room_index].occupied) {
        printf("该客房未被占用。\n");
        return;
    }
    rooms[room_index].occupied = 0;
    for (int i = 0; i < num_guests; i++) {
        if (strcmp(guests[i].name, "") != 0 && guests[i].room_num == room_num) {
            guest_index = i;
            break;
        }
    }
    if (guest_index == -1) {
        printf("没有找到对应的客人信息。\n");
        return;
    }
    strcpy(guests[guest_index].name, "");
    printf("退房成功。\n");
}

void display_room_types() {
    printf("客房类型列表：\n");
    printf("1. 标准单人间\n");
    printf("2. 标准双人间\n");
    printf("3. 豪华单人间\n");
    printf("4. 豪华双人间\n");
}

void display_room_info() {
    int room_num;
    printf("请输入您要查询的客房号：");
    scanf("%d", &room_num);
    int room_index = -1;
    for (int i = 0; i < num_rooms; i++) {
        if (rooms[i].room_num == room_num) {
            room_index = i;
            break;
        }
    }
    if (room_index == -1) {
        printf("客房号不存在。\n");
        return;
    }
    printf("客房号：%d\n", rooms[room_index].room_num);
    printf("客房类型：%s\n", rooms[room_index].room_type);
    printf("价格：%f\n", rooms[room_index].price);
    printf("是否被占用：%s\n", rooms[room_index].occupied ? "是" : "否");
}

void modify_room_info() {
    int room_num;
    printf("请输入您要修改的客房号：");
    scanf("%d", &room_num);
    int room_index = -1;
    for (int i = 0; i < num_rooms; i++) {
        if (rooms[i].room_num == room_num) {
            room_index = i;
            break;
        }
    }
    if (room_index == -1) {
        printf("客房号不存在。\n");
        return;
    }
    printf("请输入客房类型：");
    scanf("%s", rooms[room_index].room_type);
    printf("请输入价格：");
    scanf("%f", &rooms[room_index].price);
    printf("修改成功。\n");
}

void delete_room() {
    int room_num;
    printf("请输入您要删除的客房号：");
    scanf("%d", &room_num);
    int room_index = -1;
    for (int i = 0; i < num_rooms; i++) {
        if (rooms[i].room_num == room_num) {
            room_index = i;
            break;
        }
    }
    if (room_index == -1) {
        printf("客房号不存在。\n");
        return;
    }
    for (int i = room_index; i < num_rooms - 1; i++) {
        rooms[i] = rooms[i + 1];
    }
    num_rooms--;
    printf("删除成功。\n");
}

注意：上述代码只是一个简单的示例，可能存在一些不完善的地方，仅供参考，具体实现需要根据实际需求进行改动。同时，为了方便数据的保存和读取，代码中使用了文件操作，需要确保当前目录下存在名为 "data.txt" 的文件。