Queue class

#pragma once
#include <iostream>
#include <iomanip>

using namespace std;

class Queue
{
  struct Node
  {
    int a;
    Node *next;
  };

  public:
    Queue();
    void push(int b);
    void pop();
    int getlength();
    virtual void print();

  private:
    Node *head;
    Node *rear;
};

void Queue::push(int b)
{
  Node *p1 = new Node;
  p1->a = b;
  p1 -> next = NULL;
  rear->next = p1;
  rear = p1;
  head->a++;
  cout << setw(2)<<b<<setw(2)<< "进入队列"<<endl;
}

void Queue::pop()
{
  Node *p;
  p = head->next;
  cout << " "<<setw(2)<<p->a<<setw(2)<<"出队"<< endl;
  head->next = p->next;
  delete p;
  head->a--;
}

int Queue::getlength()
{
  return head->a;
}

void Queue::print()
{
  Node *p;
  p = head->next;
  cout << "队列中的元素"<< endl;
  while (p)
  {
    cout << p->a<< "->";
    p = p->next;
  }
  cout << "NULL"<< endl;
}

Queue::Queue()
{
  rear = head = new Node();
}

 

posted @ 2019-06-03 19:46  西北逍遥  阅读(267)  评论(0编辑  收藏  举报