#include<stdio.h>#include<stdlib.h>#include<stdbool.h>typedef int ElemType;//鏈隊列的結點定義 typedef struct node{  ElemType val;  struct node* next;}QueueNode;//鏈隊列的定義，包含隊頭指針和隊尾指針 typedef struct queue {  QueueNode* front;  QueueNode* rear;}LinkedQueue;//初始化隊列 LinkedQueue* initQueue() {  LinkedQueue* queue = (LinkedQueue*)malloc(sizeof(LinkedQueue));  queue->front = (QueueNode*)malloc(sizeof(QueueNode));  queue->front->next = NULL;  queue->rear = queue->front;}//元素入隊 void enQueue(LinkedQueue* queue, ElemType elem) {  QueueNode* node = (QueueNode*)malloc(sizeof(QueueNode));  node->val = elem;  node->next = NULL;  queue->rear->next = node;  queue->rear = node;}//隊列是否為空 bool isQueueEmpty(LinkedQueue* queue) {  return queue->front == queue->rear; }//元素出隊 ElemType deQueue(LinkedQueue* queue) {  if(!isQueueEmpty(queue)) {    QueueNode* p = queue->front;    queue->front = p->next;    ElemType e = queue->front->val;    free(p);    return e;  }  return NULL;}int main(){  LinkedQueue* queue = initQueue();  int i;  for(i = 0; i < 20; i++) {    enQueue(queue, i);  }  while(!isQueueEmpty(queue)) {    printf("deQueue: %d/n", deQueue(queue));  }  return 0;}