Merge pull request #43 from qualifier1024/patch-12

Update queue.cpp

codes/cpp/chapter_stack_and_queue/queue.cpp

@@ -1,8 +1,39 @@
 /*
  * File: queue.cpp
- * Created Time: 2022-11-25
- * Author: Krahets (krahets@163.com)
+ * Created Time: 2022-11-28
+ * Author: qualifier1024 (2539244001@qq.com)
  */
 
 #include "../include/include.hpp"
 
+int main(){
+    /* 初始化队列 */
+    queue<int> queue;
+    
+    /* 元素入队 */
+    queue.push(1);
+    queue.push(3);
+    queue.push(2);
+    queue.push(5);
+    queue.push(4);
+    cout << "队列 queue = ";
+    PrintUtil::printQueue(queue);
+    
+    /* 访问队首元素 */
+    int front = queue.front();
+    cout << "队首元素 front = " << front << endl;
+    
+    /* 元素出队 */
+    queue.pop();
+    cout << "出队元素 front = " << front << "，出队后 queue = ";
+    PrintUtil::printQueue(queue);
+    
+    /* 获取队列的长度 */
+    int size = queue.size();
+    cout << "队列长度 size = " << size << endl;
+    
+    /* 判断队列是否为空 */
+    bool isEmpty = queue.empty();
+    
+    return 0;
+}