Write a program to implement operation on queue.

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<iomanip.h>
const int max=5;
class queue
{
    private:
       int qu[max];
       int front,rear;
    public:
       queue()
       {
      front=-1;
      rear=-1;
       }
       void addq();
       void delq();
       void show();
};
void queue:: addq()
{
    int item;
    if(rear==max-1)
    {
       cout<<endl<<"Queue is Full";
       return;
    }
    rear++;
    cout<<endl<<"Enter the item to be inserted:";
    cin>>item;
    qu[rear]=item;
    if(front==-1)
    {
       front=0;
    }
}
    void queue:: delq()
    {
     int item;
     if(front ==-1)
     {
    cout<<endl<<"Queue is empty";
    return;
     }
     item=qu[front];
     cout<<"\nItem Deleted:"<<item;
     if(front==rear)
     {
    front=rear-1;
     }
     else
     {
    front++;
    return;
     }
    }
    void queue:: show()
    {
      if(front ==-1)
      cout<<endl<<"Queue is empty";
      else
     {
        cout<<"\nQueue Element:";
        for(int i=front ;i<=rear;i++)
        cout<<setw(4)<<qu[i];
     }
    }
void main()
{
   int choice;
   queue Q;
   clrscr();
   do{
     cout<<"\n------Queue Operations-----------\n";
     cout<<"\n1.Insert";
     cout<<"\n2.Delete";
     cout<<"\n3.Display";
     cout<<"\n4.Exit";
     cout<<"\nEnter your choice:";
     cin>>choice;
     switch(choice)
     {
    case 1: Q.addq();
        break;
    case 2: Q.delq();
        break;
    case 3: Q.show();
        break;
    case 4: exit(0);
    default: cout<<"\nWrong Choice!!";
     }
   }while(choice!=4);
   getch();
}