C语言用链表实现顾客根据TXT文件中菜品信息完成对订单的增删改查，并输出txt文件

非常感谢您的提问！以下是C语言用链表实现顾客根据TXT文件中菜品信息完成对订单的增删改查，并输出txt文件的代码：

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

typedef struct dish {
    int id;
    char name[50];
    int price;
    struct dish *next;
} Dish;

Dish *head, *tail;

Dish *createDish(int id, char *name, int price) {
    Dish *dish = (Dish*)malloc(sizeof(Dish));
    dish->id = id;
    strcpy(dish->name, name);
    dish->price = price;
    dish->next = NULL;
    return dish;
}

void addDish(int id, char *name, int price) {
    Dish *dish = createDish(id, name, price);
    if (head == NULL) {
        head = dish;
    } else {
        tail->next = dish;
    }
    tail = dish;
}

void displayDishes() {
    Dish *dish = head;
    while (dish != NULL) {
        printf("%d\t%s\t%d\n", dish->id, dish->name, dish->price);
        dish = dish->next;
    }
}

void freeDishes() {
    Dish *dish = head;
    while (dish != NULL) {
        Dish *temp = dish->next;
        free(dish);
        dish = temp;
    }
    head = NULL;
    tail = NULL;
}

void readDishes(char *filename) {
    FILE *file = fopen(filename, "r");
    if (file == NULL) {
        printf("Failed to read file: %s\n", filename);
        return;
    }
    char line[100];
    while (fgets(line, sizeof(line), file)) {
        int id, price;
        char name[50];
        sscanf(line, "%d,%[^,],%d", &id, name, &price);
        addDish(id, name, price);
    }
    fclose(file);
}

void saveDishes(char *filename) {
    FILE *file = fopen(filename, "w");
    if (file == NULL) {
        printf("Failed to save file: %s\n", filename);
        return;
    }
    Dish *dish = head;
    while (dish != NULL) {
        fprintf(file, "%d,%s,%d\n", dish->id, dish->name, dish->price);
        dish = dish->next;
    }
    fclose(file);
}

void addOrder(int id, int quantity) {
    Dish *dish = head;
    while (dish != NULL) {
        if (dish->id == id) {
            dish->price *= quantity;
            return;
        }
        dish = dish->next;
    }
    printf("Dish not found with id: %d\n", id);
}

void removeOrder(int id) {
    Dish *dish = head;
    if (dish->id == id) {
        head = dish->next;
        free(dish);
        return;
    }
    while (dish->next != NULL) {
        if (dish->next->id == id) {
            Dish *toDelete = dish->next;
            dish->next = toDelete->next;
            free(toDelete);
            return;
        }
        dish = dish->next;
    }
    printf("Dish not found with id: %d\n", id);
}

void updateOrder(int id, int newPrice) {
    Dish *dish = head;
    while (dish != NULL) {
        if (dish->id == id) {
            dish->price = newPrice;
            return;
        }
        dish = dish->next;
    }
    printf("Dish not found with id: %d\n", id);
}

int main() {
    readDishes("dishes.txt");
    printf("Menu:\n");
    displayDishes();
    addOrder(1, 2);
    printf("Order updated:\n");
    displayDishes();
    removeOrder(2);
    printf("Order removed:\n");
    displayDishes();
    updateOrder(3, 50);
    printf("Order updated:\n");
    displayDishes();
    saveDishes("dishes_new.txt");
    freeDishes();
    return 0;
}

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