#include<iostream>
#include<conio.h>
#include<stdlib.h>
using namespace std;
 
class queue
{
              int queue1[5];
              int rear,front;
      public:
              queue()
                {
                     rear=-1;
                     front=-1;
                }
              void insert(int x)
               {
                   if(rear >  4)
                    {
                       cout <<"queue over flow";
                       front=rear=-1;
                       return;
                    }
                    queue1[++rear]=x;
                    cout <<"inserted" <<x;
               }
              void delet()
               {
                   if(front==rear)
                     {
                         cout <<"queue under flow";
                         return;
                     }
                     cout <<"deleted" <<queue1[++front];
                }
              void display()
               {
                   if(rear==front)
                     {
                          cout <<" queue empty";
                          return;
                     }
                   for(int i=front+1;i<=rear;i++)
                   cout <<queue1[i]<<" ";
               }
};
 
main()
{
      int ch;
      queue qu;
      while(1)
        {
              cout <<"\n1.insert  2.delet  3.display  4.exit\nEnter ur choice";
              cin >> ch;
              switch(ch)
                {
                  case 1:    cout <<"enter the element";
                           	 cin >> ch;
                             qu.insert(ch);
                             break;
                  case 2:  qu.delet();  break;
                  case 3:  qu.display();break;
                  case 4: exit(0);
                  }
          }
return (0);
}

OUTPUT
 1.insert  2.delet  3.display  4.exit
 Enter ur choice1
 enter the element21
 inserted21
 1.insert  2.delet  3.display  4.exit
 Enter ur choice1

enter the element22
 inserted22
1.insert  2.delet  3.display  4.exit
 Enter ur choice1
 enter the element16
 inserted16

1.insert  2.delet  3.display  4.exit
 Enter ur choice3
 21 22 16

1.insert  2.delet  3.display  4.exit
 Enter ur choice2
 deleted21

1.insert  2.delet  3.display  4.exit
 Enter ur choice3
 22 16

1.insert  2.delet  3.display  4.exit
 Enter ur choice

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