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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. class Queue
  5. {
  6.       private:
  7.                 string *arr;
  8.                 int frnt,rear;
  9.                 int capacity;
  10.                 int size=0;
  11.  
  12.       public:
  13.              Queue(int cap)
  14.              {
  15.                        capacity=cap;
  16.                        frnt=-1;
  17.                        rear=-1;
  18.                        arr=new string[capacity] ;
  19.              }
  20.  
  21.              void enqueue(string val)
  22.              {
  23.                       if(isfull())
  24.                       {
  25.  
  26.                          cout<< "queue is full"<<endl;
  27.  
  28.                       }
  29.                    else{
  30.                      rear=(rear+1)%capacity;
  31.                       arr[rear]=val;
  32.                       if(frnt==-1) frnt=0;
  33.                    }
  34.                       size++;
  35.              }
  36.  
  37.              void dequeue()
  38.              {
  39.                         if( isempty())
  40.                                  {
  41.                                             cout<< "queue is empty"<<endl;
  42.                                  }
  43.                                  else{
  44.  
  45.                         frnt=(frnt+1)%capacity;
  46.                         size--;
  47.                                  }
  48.  
  49.              }
  50.              bool isfull()
  51.              {
  52.                        if(size==capacity)
  53.                               return true;
  54.                        else
  55.                               return false;
  56.  
  57.  
  58.              }
  59.  
  60.              bool isempty()
  61.              {
  62.                        if(size==0)
  63.                               return true;
  64.                        else
  65.                               return false;
  66.                   }
  67.  
  68.                   string getFront()
  69.                   {
  70.                             return arr[frnt];
  71.                   }
  72.                   int getsize()
  73.                   {
  74.                             return size;
  75.                   }
  76.                   void print()
  77.                   {
  78.                             if(isempty())
  79.                             {
  80.                                       cout<< "queue is empty"<<endl;
  81.                             }
  82.                             int j=frnt;
  83.                             for(int i=0;i<size;i++)
  84.                             {
  85.                                       cout<< arr[j]<< " ";
  86.                                       j=(j+1)%capacity;
  87.                             }
  88.                             cout<<endl;
  89.                   }
  90.  
  91.                   void enqfront(string val)
  92.                   {
  93.                             if(isfull()) cout<< "overflow"<<endl;
  94.                             else if(frnt==-1)
  95.                             {
  96.                                       frnt++;
  97.                                        rear++;
  98.                             }
  99.                             else if(frnt==0) frnt=capacity-1;
  100.                             else frnt--;
  101.                             arr[frnt]=val;
  102.                             size++;
  103.                   }
  104.  
  105.                   void dqrear()
  106.                   {
  107.                             if(isempty())
  108.                             {
  109.                                       cout<< "underflow"<<endl;
  110.                             }
  111.                             else if(rear==0) rear=capacity-1;
  112.                             else rear--;
  113.                             size--;
  114.  
  115.                   }
  116. };
  117.  
  118. int main()
  119. {
  120.         Queue q(10);
  121.         q.enqfront("violet");
  122.        q.enqueue("apple");
  123.        q.enqueue("mango");
  124.        q.enqueue("red");
  125.  
  126.        q.enqueue("green");
  127.        q.enqueue("blue");
  128.        q.enqueue("orange");
  129.         q.enqfront("violet");
  130.        q.print();
  131.  
  132.         cout<<q.getsize()<<endl;
  133.        q.dequeue();
  134.        q.dequeue();
  135.        q.dequeue();
  136.  
  137.  
  138.        q.print();
  139.        q.dqrear();
  140.        q.print();
  141.        string s=q.getFront();
  142.        cout<<s<<endl;
  143.  
  144.        cout<<q.getsize()<<endl;
  145.     return 0;
  146. }
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin 
Standard input is empty
stdout 
violet violet apple mango red green blue orange 
8
mango red green blue orange 
mango red green blue 
mango
4
https://ideone.com/64lWtU
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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