c餐厅点餐系统程序设计

以下是一个简单的餐厅点餐系统的C语言程序设计，具体实现细节可能会根据实际需求进行调整。

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

struct MenuItem {
    int id;
    char name[50];
    float price;
};

struct OrderItem {
    int id;
    char name[50];
    int quantity;
    float price;
};

void displayMenu(struct MenuItem menu[], int size);
int getItemIndex(struct MenuItem menu[], int size, int id);
void addOrderItem(struct MenuItem menu[], int size, struct OrderItem orders[], int *ordersSize, int id, int quantity);
void displayOrder(struct OrderItem orders[], int size);
void removeOrderItem(struct OrderItem orders[], int *ordersSize, int index);
float calculateTotal(struct OrderItem orders[], int size);

int main() {
    int choice;
    int ordersSize = 0;
    struct MenuItem menu[] = {
        {1, "Hamburger", 3.50},
        {2, "Cheeseburger", 4.00},
        {3, "Fries", 2.00},
        {4, "Soda", 1.50}
    };
    int menuSize = sizeof(menu) / sizeof(struct MenuItem);
    struct OrderItem orders[50];

    printf("Welcome to our restaurant!\n");

    do {
        printf("\nPlease select an option:\n");
        printf("1. Display menu\n");
        printf("2. Add item to order\n");
        printf("3. Display order\n");
        printf("4. Remove item from order\n");
        printf("5. Calculate total\n");
        printf("6. Quit\n");
        printf("Enter your choice (1-6): ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                displayMenu(menu, menuSize);
                break;
            case 2:
                int id, quantity;
                printf("Enter item ID: ");
                scanf("%d", &id);
                printf("Enter quantity: ");
                scanf("%d", &quantity);
                addOrderItem(menu, menuSize, orders, &ordersSize, id, quantity);
                break;
            case 3:
                displayOrder(orders, ordersSize);
                break;
            case 4:
                int index;
                printf("Enter item index: ");
                scanf("%d", &index);
                removeOrderItem(orders, &ordersSize, index);
                break;
            case 5:
                printf("Total: $%.2f\n", calculateTotal(orders, ordersSize));
                break;
            case 6:
                printf("Thank you for visiting our restaurant!\n");
                break;
            default:
                printf("Invalid choice. Please select again.\n");
                break;
        }

    } while (choice != 6);

    return 0;
}

void displayMenu(struct MenuItem menu[], int size) {
    printf("\nMenu:\n");
    for (int i = 0; i < size; i++) {
        printf("%d. %s - $%.2f\n", menu[i].id, menu[i].name, menu[i].price);
    }
}

int getItemIndex(struct MenuItem menu[], int size, int id) {
    for (int i = 0; i < size; i++) {
        if (menu[i].id == id) {
            return i;
        }
    }
    return -1;
}

void addOrderItem(struct MenuItem menu[], int size, struct OrderItem orders[], int *ordersSize, int id, int quantity) {
    int index = getItemIndex(menu, size, id);
    if (index == -1) {
        printf("Invalid item ID. Please try again.\n");
        return;
    }
    struct MenuItem item = menu[index];
    struct OrderItem orderItem = {item.id, item.name, quantity, item.price * quantity};
    orders[*ordersSize] = orderItem;
    (*ordersSize)++;
    printf("Item added to order.\n");
}

void displayOrder(struct OrderItem orders[], int size) {
    printf("\nOrder:\n");
    for (int i = 0; i < size; i++) {
        printf("%d. %s x %d - $%.2f\n", orders[i].id, orders[i].name, orders[i].quantity, orders[i].price);
    }
}

void removeOrderItem(struct OrderItem orders[], int *ordersSize, int index) {
    if (index < 0 || index >= *ordersSize) {
        printf("Invalid item index. Please try again.\n");
        return;
    }
    for (int i = index; i < *ordersSize - 1; i++) {
        orders[i] = orders[i + 1];
    }
    (*ordersSize)--;
    printf("Item removed from order.\n");
}

float calculateTotal(struct OrderItem orders[], int size) {
    float total = 0.0;
    for (int i = 0; i < size; i++) {
        total += orders[i].price;
    }
    return total;
}

这个程序实现了一个简单的餐厅点餐系统，包括显示菜单、添加订单、显示订单、删除订单、计算总价等功能。它使用了结构体来表示菜单和订单项，并使用了函数来处理不同的任务，使代码更易于理解和维护。