C++ Program - Queue Operations Using Class

C++ PROGRAM TO IMPLEMENT QUEUE USING ARRAY.
#include<iostream.h>
#include<conio.h>
class queue
{
  public:
  int q[5],front,rear,x,result;
void enq();
void dque();
void disp();
queue()
{
front=0;
rear=0;
}
};
void queue::enq()
{
  if(rear>=5)
  cout<<"\nQueue overflow!!\n";
else
{
cout<<"\nEnter the number to be inserted: ";
cin>>x;
rear++;
q[rear]=x;
cout<<"\nNumber pushed in the queue:"<<q[rear];
}
}
void queue::dque()
{
  if(rear==0)
  cout<<"\nQueue underflow!!\n";
  else
  {
if(front==rear)
{
front=0;
rear=0;
}
else
front++;
}
cout<<"\nDeleted element is:";
  result=q[front];
  cout<<result;
}
void queue::disp()
{
  if(rear==0)
cout<<"\nQueue underflow!!\n";
  else
cout<<"\nContents of queue is:";
  for(int i=front+1;i<=rear;i++)
cout<<q[i]<<"\t";
}
void main()
{
  int c;
queue qu;
clrscr();
// cout<<"\n*****";
// cout<<"\nQUEUE";
// cout<<"\n*****";
do
{
cout<<"\n1.Insertion\n2.Deletion\n3.Display\n";
cout<<"\nEnter your choice:";
cin>>c;
switch(c)
{
case 1:
qu.enq();
break;
case 2:
qu.dque();
break;
case 3:
qu.disp();
break;
default:
cout<<"\nInvalid choice!!\n";
}
}
while(c<4);
getch();
}
OUTPUT