c语言餐饮排队叫号系统

以下是一个简单的c语言餐饮排队叫号系统的代码示例：

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

struct queue {
    int id;
    struct queue *next;
};

struct queue *head = NULL;
struct queue *tail = NULL;
int count = 0;

void enqueue(int id) {
    struct queue *newNode = (struct queue*)malloc(sizeof(struct queue));
    newNode->id = id;
    newNode->next = NULL;
    if (head == NULL) {
        head = newNode;
        tail = newNode;
    }
    else {
        tail->next = newNode;
        tail = newNode;
    }
    count++;
    printf("顾客 %d 已进入队列，当前队列长度为 %d\n", id, count);
}

void dequeue() {
    if (head == NULL) {
        printf("队列为空\n");
    }
    else {
        struct queue *temp = head;
        head = head->next;
        free(temp);
        count--;
        printf("顾客 %d 已离开队列，当前队列长度为 %d\n", temp->id, count);
    }
}

void display() {
    if (head == NULL) {
        printf("队列为空\n");
    }
    else {
        printf("当前队列情况：\n");
        struct queue *current = head;
        while (current != NULL) {
            printf("%d ", current->id);
            current = current->next;
        }
        printf("\n");
    }
}

int main() {
    int choice, id;
    while (1) {
        printf("欢迎使用餐饮排队叫号系统！\n");
        printf("请选择以下操作：\n");
        printf("1. 进入队列\n");
        printf("2. 离开队列\n");
        printf("3. 显示队列\n");
        printf("4. 退出系统\n");
        scanf("%d", &choice);
        switch (choice) {
        case 1:
            printf("请输入您的编号：\n");
            scanf("%d", &id);
            enqueue(id);
            break;
        case 2:
            dequeue();
            break;
        case 3:
            display();
            break;
        case 4:
            printf("欢迎再次使用！\n");
            exit(0);
            break;
        default:
            printf("输入有误，请重新输入！\n");
            break;
        }
    }
    return 0;
}

该示例使用链表实现了一个简单的队列，并提供了进入队列、离开队列和显示队列等基本操作，以实现餐饮排队叫号系统的功能。