用c语言编写一个程序模拟餐馆点餐系统。 1)用户分为管理员和用餐者两类，分别显示不同文本格式菜单，通过菜单项对应数字进行选择。 2)用餐者菜单包括菜品分类（大类）、菜品列表（含每道菜品的构成信息）、点餐、付费、查询等功能。 3)管理员菜单包括菜品信息和用餐者信息录入、修改和删除。菜品信息至少应包括：编号、菜名、类别、价格等；用餐者信息至少应包括：编号、姓名、点餐信息、付费金额、用餐状态（就餐或打包）等。可根据菜品名称或编号进行菜品构成查询；可查询用餐者点餐情况、费用情况；可统计菜品的日点餐量、日营业额等（选做）。 命令行参数如下： Restb –a (-u) xxxx 第一个参数为可执行程序名称；第二个参数为用户身份，-a表示管理员，-u表示用餐者；第三个参数为用餐者名称，请写出详细框架

下面是一个简单的框架：

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

typedef struct menu_item {
    int id;
    char name[50];
    char category[20];
    double price;
    struct menu_item *next;
} MenuItem;

typedef struct order_item {
    int id;
    char name[50];
    int quantity;
    double price;
    struct order_item *next;
} OrderItem;

typedef struct customer {
    int id;
    char name[50];
    OrderItem *order_head;
    double total_price;
    char status[10];
    struct customer *next;
} Customer;

void print_menu();
void print_admin_menu();
void print_customer_menu();
MenuItem *add_menu_item(MenuItem *head, int id, char *name, char *category, double price);
void print_menu_items(MenuItem *head);
MenuItem *find_menu_item(MenuItem *head, char *name);
void delete_menu_item(MenuItem *head, char *name);
void add_customer(Customer *head, char *name);
Customer *find_customer(Customer *head, char *name);
void add_order(Customer *head, char *name, int id, char *item_name, int quantity);
void print_order(Customer *head, char *name);
void print_customer_list(Customer *head);
void calculate_statistics(MenuItem *menu_head, Customer *customer_head);

int main(int argc, char *argv[]) {
    // 解析命令行参数，确定用户身份和名称
    char *user_type = NULL;
    char *user_name = NULL;
    if (argc < 3) {
        printf("Usage: %s -a/-u user_name\n", argv[0]);
        exit(EXIT_FAILURE);
    }
    user_type = argv[1];
    user_name = argv[2];

    // 初始化菜单
    MenuItem *menu_head = NULL;
    menu_head = add_menu_item(menu_head, 1, "鱼香肉丝", "川菜", 26.0);
    menu_head = add_menu_item(menu_head, 2, "宫保鸡丁", "川菜", 24.0);
    menu_head = add_menu_item(menu_head, 3, "红烧肉", "家常菜", 28.0);
    menu_head = add_menu_item(menu_head, 4, "糖醋排骨", "家常菜", 30.0);
    menu_head = add_menu_item(menu_head, 5, "炒青菜", "素菜", 16.0);
    menu_head = add_menu_item(menu_head, 6, "鱼香茄子", "素菜", 18.0);

    // 初始化顾客列表
    Customer *customer_head = NULL;
    add_customer(customer_head, "张三");
    add_order(customer_head, "张三", 1, "鱼香肉丝", 2);
    add_order(customer_head, "张三", 3, "红烧肉", 1);
    add_customer(customer_head, "李四");
    add_order(customer_head, "李四", 2, "宫保鸡丁", 1);
    add_order(customer_head, "李四", 6, "鱼香茄子", 2);

    // 根据用户身份显示不同的菜单
    if (strcmp(user_type, "-a") == 0) {
        print_admin_menu();
        // 管理员菜单
        // ...
    } else if (strcmp(user_type, "-u") == 0) {
        print_customer_menu();
        // 用餐者菜单
        // ...
    } else {
        printf("Invalid user type: %s\n", user_type);
        exit(EXIT_FAILURE);
    }

    // 释放内存
    // ...
    return 0;
}

void print_menu() {
    printf("========== 菜单 ==========\n");
    printf("%-5s%-20s%-10s%-10s\n", "编号", "名称", "分类", "价格");
    printf("--------------------------\n");
    // 输出菜单项
    printf("\n");
}

void print_admin_menu() {
    printf("========== 管理员菜单 ==========\n");
    printf("1. 添加菜品\n");
    printf("2. 修改菜品\n");
    printf("3. 删除菜品\n");
    printf("4. 添加用餐者\n");
    printf("5. 删除用餐者\n");
    printf("6. 查询菜品构成\n");
    printf("7. 查询用餐者点餐情况\n");
    printf("8. 查询营业额\n");
    printf("9. 退出\n\n");
}

void print_customer_menu() {
    printf("========== 用餐者菜单 ==========\n");
    printf("1. 查看菜单\n");
    printf("2. 点餐\n");
    printf("3. 查看订单\n");
    printf("4. 修改订单\n");
    printf("5. 删除订单\n");
    printf("6. 结算\n");
    printf("7. 退出\n\n");
}

MenuItem *add_menu_item(MenuItem *head, int id, char *name, char *category, double price) {
    // 创建新的菜单项节点
    MenuItem *new_item = (MenuItem *)malloc(sizeof(MenuItem));
    new_item->id = id;
    strcpy(new_item->name, name);
    strcpy(new_item->category, category);
    new_item->price = price;
    new_item->next = NULL;

    // 将新的菜单项节点插入链表
    if (head == NULL) {
        head = new_item;
    } else {
        MenuItem *p = head;
        while (p->next != NULL) {
            p = p->next;
        }
        p->next = new_item;
    }

    return head;
}

void print_menu_items(MenuItem *head) {
    MenuItem *p = head;
    while (p != NULL) {
        printf("%-5d%-20s%-10s%-10.2lf\n", p->id, p->name, p->category, p->price);
        p = p->next;
    }
}

MenuItem *find_menu_item(MenuItem *head, char *name) {
    MenuItem *p = head;
    while (p != NULL) {
        if (strcmp(p->name, name) == 0) {
            return p;
        }
        p = p->next;
    }
    return NULL;
}

void delete_menu_item(MenuItem *head, char *name) {
    // 找到要删除的节点
    MenuItem *p = head;
    MenuItem *prev = NULL;
    while (p != NULL) {
        if (strcmp(p->name, name) == 0) {
            break;
        }
        prev = p;
        p = p->next;
    }

    // 删除节点
    if (p != NULL) {
        if (prev == NULL) {
            head = p->next;
        } else {
            prev->next = p->next;
        }
        free(p);
    }
}

void add_customer(Customer *head, char *name) {
    // 创建新的顾客节点
    Customer *new_customer = (Customer *)malloc(sizeof(Customer));
    new_customer->id = rand();
    strcpy(new_customer->name, name);
    new_customer->order_head = NULL;
    new_customer->total_price = 0.0;
    strcpy(new_customer->status, "就餐");
    new_customer->next = NULL;

    // 将新的顾客节点插入链表
    if (head == NULL) {
        head = new_customer;
    } else {
        Customer *p = head;
        while (p->next != NULL) {
            p = p->next;
        }
        p->next = new_customer;
    }
}

Customer *find_customer(Customer *head, char *name) {
    Customer *p = head;
    while (p != NULL) {
        if (strcmp(p->name, name) == 0) {
            return p;
        }
        p = p->next;
    }
    return NULL;
}

void add_order(Customer *head, char *name, int id, char *item_name, int quantity) {
    // 找到对应的顾客节点和菜单项节点
    Customer *customer = find_customer(head, name);
    MenuItem *item = find_menu_item(menu_head, item_name);

    // 创建新的订单项节点
    OrderItem *new_order_item = (OrderItem *)malloc(sizeof(OrderItem));
    new_order_item->id = id;
    strcpy(new_order_item->name, item_name);
    new_order_item->quantity = quantity;
    new_order_item->price = item->price * quantity;
    new_order_item->next = NULL;

    // 将新的订单项节点插入链表
    if (customer->order_head == NULL) {
        customer->order_head = new_order_item;
    } else {
        OrderItem *p = customer->order_head;
        while (p->next != NULL) {
            p = p->next;
        }
        p->next = new_order_item;
    }

    // 更新顾客的总消费金额
    customer->total_price += new_order_item->price;
}

void print_order(Customer *head, char *name) {
    Customer *customer = find_customer(head, name);
    if (customer == NULL) {
        printf("顾客 %s 不存在\n", name);
        return;
    }

    printf("========== %s 的订单 ==========\n", name);
    printf("%-5s%-20s%-10s%-10s\n", "编号", "名称", "数量", "价格");
    printf("--------------------------\n");
    OrderItem *p = customer->order_head;
    while (p != NULL) {
        printf("%-5d%-20s%-10d%-10.2lf\n", p->id, p->name, p->quantity, p->price);
        p = p->next;
    }
    printf("总金额：%.2lf\n\n", customer->total_price);
}

void print_customer_list(Customer *head) {
    printf("========== 用餐者列表 ==========\n");
    printf("%-5s%-20s%-10s%-10s%-10s\n", "编号", "姓名", "消费金额", "状态", "订单数量");
    printf("---------------------------------\n");
    Customer *p = head;
    while (p != NULL) {
        printf("%-5d%-20s%-10.2lf%-10s%-10d\n", p->id, p->name, p->total_price, p->status, count_orders(p->order_head));
        p = p->next;
    }
    printf("\n");
}

void calculate_statistics(MenuItem *menu_head, Customer *customer_head) {
    // 统计菜品的日点餐量和营业额
    MenuItem *p = menu_head;
    while (p != NULL) {
        int count = count_orders_by_item(customer_head, p->name);
        double revenue = count * p->price;
        printf("%s 点餐量：%d，营业额：%.2lf\n", p->name, count, revenue);
        p = p->next;
    }

    // 统计总营业额
    double total_revenue = calculate_total_revenue(customer_head);
    printf("总营业额：%.2lf\n", total_revenue);
}