c语言订餐管理系统

好的，订餐管理系统是一个常见的应用场景。下面是一个简单的示例程序，可以实现基本的订餐管理功能：

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

#define MAX_DISHES 100 // 最大菜品数量
#define MAX_NAME_LEN 20 // 菜品名称最大长度

// 菜品结构体
typedef struct {
    char name[MAX_NAME_LEN]; // 菜品名称
    float price; // 菜品价格
} Dish;

// 菜品列表结构体
typedef struct {
    int count; // 当前菜品数量
    Dish dishes[MAX_DISHES]; // 菜品数组
} DishList;

// 显示菜品列表
void showDishList(DishList* list) {
    printf("菜单如下：\n");
    for (int i = 0; i < list->count; i++) {
        printf("%d. %s - %.2f 元\n", i + 1, list->dishes[i].name, list->dishes[i].price);
    }
}

// 添加菜品
void addDish(DishList* list) {
    if (list->count >= MAX_DISHES) {
        printf("菜品数量已达上限，无法添加！\n");
        return;
    }

    Dish dish;
    printf("请输入新菜品名称：");
    scanf("%s", dish.name);
    printf("请输入新菜品价格：");
    scanf("%f", &dish.price);

    list->dishes[list->count] = dish;
    list->count++;

    printf("添加成功！\n");
}

// 订单结构体
typedef struct {
    DishList* list; // 菜品列表指针
    int* counts; // 菜品数量数组指针
    int totalCount; // 订单总菜品数量
    float totalPrice; // 订单总价格
} Order;

// 初始化订单
void initOrder(Order* order, DishList* list) {
    order->list = list;
    order->counts = (int*)malloc(sizeof(int) * list->count);
    memset(order->counts, 0, sizeof(int) * list->count);
    order->totalCount = 0;
    order->totalPrice = 0.0f;
}

// 显示订单详情
void showOrder(Order* order) {
    printf("您的订单如下：\n");
    for (int i = 0; i < order->list->count; i++) {
        if (order->counts[i] > 0) {
            printf("%d × %s - %.2f 元\n", order->counts[i], order->list->dishes[i].name, order->list->dishes[i].price * order->counts[i]);
        }
    }
    printf("总计 %d 份菜品，共 %.2f 元\n", order->totalCount, order->totalPrice);
}

// 添加菜品到订单
void addToOrder(Order* order) {
    int index;
    printf("请输入要点的菜品编号：");
    scanf("%d", &index);

    if (index < 1 || index > order->list->count) {
        printf("无效的菜品编号！\n");
        return;
    }

    int count;
    printf("请输入要点的份数：");
    scanf("%d", &count);

    if (count <= 0) {
        printf("无效的份数！\n");
        return;
    }

    order->counts[index - 1] += count;
    order->totalCount += count;
    order->totalPrice += count * order->list->dishes[index - 1].price;

    printf("添加成功！\n");
}

int main() {
    DishList dishList;
    dishList.count = 3;
    dishList.dishes[0] = (Dish){"鱼香肉丝", 18.0f};
    dishList.dishes[1] = (Dish){"宫保鸡丁", 22.0f};
    dishList.dishes[2] = (Dish){"糖醋里脊", 20.0f};

    Order order;
    initOrder(&order, &dishList);

    while (1) {
        int choice;
        printf("\n请选择操作：\n");
        printf("1. 查看菜单\n");
        printf("2. 添加菜品到订单\n");
        printf("3. 查看订单\n");
        printf("4. 退出\n");
        printf("请输入选项：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                showDishList(&dishList);
                break;
            case 2:
                addToOrder(&order);
                break;
            case 3:
                showOrder(&order);
                break;
            case 4:
                return 0;
            default:
                printf("无效的选项！\n");
                break;
        }
    }

    return 0;
}

这个程序实现了一个简单的订餐管理系统。用户可以查看菜单、添加菜品到订单、查看订单等操作。订单结构体中包含了菜品列表指针、菜品数量数组指针、订单总菜品数量和订单总价格等信息。用户可以通过菜品编号和份数将菜品添加到订单中，程序会自动计算订单总价格和总份数。