c语言链表订餐管理系统

以下是一个简单的C语言链表订餐管理系统的示例：

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

// 定义菜品结构体
typedef struct Dish {
    int id;
    char name[100];
    float price;
    struct Dish* next;
} Dish;

// 全局变量，指向链表头节点
Dish* head = NULL;

// 创建新菜品节点
Dish* createDish(int id, char name[], float price) {
    Dish* newDish = (Dish*)malloc(sizeof(Dish));
    newDish->id = id;
    strcpy(newDish->name, name);
    newDish->price = price;
    newDish->next = NULL;
    return newDish;
}

// 添加菜品到链表
void addDish(int id, char name[], float price) {
    Dish* newDish = createDish(id, name, price);
    if (head == NULL) {
        head = newDish;
    } else {
        Dish* current = head;
        while (current->next != NULL) {
            current = current->next;
        }
        current->next = newDish;
    }
}

// 打印菜单
void printMenu() {
    Dish* current = head;
    printf("菜单：\n");
    while (current != NULL) {
        printf("ID：%d，名称：%s，价格：%.2f\n", current->id, current->name, current->price);
        current = current->next;
    }
}

// 查找菜品
Dish* findDish(int id) {
    Dish* current = head;
    while (current != NULL) {
        if (current->id == id) {
            return current;
        }
        current = current->next;
    }
    return NULL;
}

// 删除菜品
void deleteDish(int id) {
    Dish* current = head;
    Dish* previous = NULL;
    while (current != NULL) {
        if (current->id == id) {
            if (previous == NULL) {
                head = current->next;
            } else {
                previous->next = current->next;
            }
            free(current);
            return;
        }
        previous = current;
        current = current->next;
    }
}

int main() {
    // 添加菜品到链表
    addDish(1, "鱼香肉丝", 18.0);
    addDish(2, "宫保鸡丁", 20.0);
    addDish(3, "红烧肉", 25.0);

    // 打印菜单
    printMenu();

    // 查找菜品
    int dishId = 2;
    Dish* foundDish = findDish(dishId);
    if (foundDish != NULL) {
        printf("找到了ID为%d的菜品：%s，价格：%.2f\n", dishId, foundDish->name, foundDish->price);
    } else {
        printf("未找到ID为%d的菜品\n", dishId);
    }

    // 删除菜品
    int deleteId = 3;
    deleteDish(deleteId);
    printf("删除ID为%d的菜品后的菜单：\n", deleteId);
    printMenu();

    return 0;
}