Queue operations

/*Program to empelement Queue operations
compiler- Turbo c++     author- Mangilal Sharma
--------------------------------------------------------*/
#include <process.h>
#include <conio.h>
#include <iostream.h>
#define max 5

class queue
{
 private:
 int rear,front,choice;
 int queue_arr[max];
 public:
 void insert();
 void del();
 void display();
 queue();
};

void queue::insert()
{
 int added_item;
 if(rear==(max-1))
 {
  cout<<"Queue is Overflow\n";
 }
 else
 {
  if(front==-1)
  front=0;
  cout<<"\n               Insert the element for adding in Queue: ";
  cin>>added_item;
  rear=rear+1;
  queue_arr[rear]=added_item;
 }
}

void queue::del()
{
 if(front==-1&&rear==-1)
 {
  cout<<"Queue is Underflow\n";
  return;
 }
 else
 {
  cout<<"Element delete from Queue is "<<queue_arr[front];
 }
 if(rear==front) rear=front=-1;
 else if(front==max-1) front=0;
 else front=front+1;
}

void queue::display()
{
 int i;
 if(front==-1)
 cout<<"Queue is Empty\n";
 else
 {
  cout<<"Queue is:\n";
  for(i=front;i<=rear;i++)
  cout<<queue_arr[i];
  cout<<"\n";
 }
}

queue::queue()
{
 rear=-1;
 front=-1;
 while(1)
 {
  cout<<"\n\t\t         QUEUE\n";
  cout<<"\t\t1. To Insert an Element\n";
  cout<<"\t\t2. To Delete an Element\n";
  cout<<"\t\t3. To Display the Elements\n";
  cout<<"\t\t4. To Main page\n";
  cout<<"\t\t5. To Exit from Program\n";
  cout<<"\n\t\t Enter Your Choice= ";
  cin>>choice;
  switch(choice)
  {
   case 1:
   insert();break;
   case 2:
   del();break;
   case 3:
   display();break;
   case 4:
 return;
   case 5:
 exit(1);
   default:
  cout<<"\n\t\tWrong Choice, Enter Again\n";
  }
 }
}
/*=========================5Nov.,2010=============================*/