public class MyQueue<T> : IDisposable
 {
  private T[] queue;
  private int length;
  private int capacity;
  private int head = 0;
  private int tail = 0;

  public MyQueue(int capacity) {
   this.capacity = capacity;
   this.head = 0;
   this.tail = 0;
   this.length = 0;
   this.queue = new T[capacity];
  }

  public void Clear() {
   head = 0;
   tail = 0;
   length = 0;
  }

  public bool IsEmpty() {
   return length == 0;
  }

  public bool IsFull() {
   return length == capacity;
  }

  public int Length() {
   return length;
  }

  public bool EnQueue(T node) {
   if (!IsFull()) {
    queue[tail] = node;
    tail = (++tail) % capacity;
    length++;
    return true;
   }
   return false;
  }

  public T DeQueue() {
   T node = default(T);
   if (!IsEmpty()) {
    node = queue[head];
    head = (++head) % capacity;
    length--;
   }
   return node;
  }

  public void Traverse() {
   for (int i = head; i < length + head; i++) {
    Console.WriteLine(queue[i % capacity]);
    Console.WriteLine($"前面还有{i - head}个");
   }
  }

  public void Dispose() {
   queue = null;
  }
 }

class Program
 {
  static void Main(string[] args) {
   MyQueue<int> queue = new MyQueue<int>(4);
   queue.EnQueue(10);
   queue.EnQueue(16);
   queue.EnQueue(18);
   queue.EnQueue(12);
   queue.Traverse();
   Console.Read();
  }
 }

class Program
 {
  static void Main(string[] args) {
   MyQueue<int> queue = new MyQueue<int>(4);
   queue.EnQueue(10);
   queue.EnQueue(16);
   queue.EnQueue(18);
   queue.EnQueue(12);
   queue.Traverse();

   Console.WriteLine("弹两个出去");
   queue.DeQueue();
   queue.DeQueue();
   Console.WriteLine();
   queue.Traverse();
   Console.Read();
  }
 }

public class Customer
 {
  public string Name { get; set; }

  public int Age { get; set; }

  public void PringInfo() {
   Console.WriteLine("姓名:" + Name);
   Console.WriteLine("年龄:" + Age);
   Console.WriteLine();
  }
 }

class Program
 {
  static void Main(string[] args) {
   MyQueue<Customer> queue = new MyQueue<Customer>(5);
   queue.EnQueue(new Customer() { Name = "宋小二", Age = 29 });
   queue.EnQueue(new Customer() { Name = "陈小三", Age = 28 });
   queue.EnQueue(new Customer() { Name = "王小四", Age = 26 });
   queue.EnQueue(new Customer() { Name = "朱小五", Age = 48 });
   for (int i = 0; i < queue.Length(); i++) {
    queue[i].PringInfo();
   }
   Console.Read();
  }
 }

   public T this[int index] {
    get {
     return queue[index];
    }
   }

public IEnumerator<T> GetEnumerator() {
   foreach(T node in queue) {
    if(node != null) { 
     yield return node;
    }
   }
  }

  IEnumerator IEnumerable.GetEnumerator() {
   return GetEnumerator();
  }