C Program for Double Ended Queue

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
    int queue[10],front = -1,rear=1,ch,val,i;
clrscr();
do{
   printf("1.add 2.delete 3.display 4.exit");
scanf("%d" & ch);
if(ch == 1)
{
  scanf("%d", & val);
  if(front == 1 && rear == 1)
   {
 front =0;
 rear = 0;
 queue[rear] = val;
}
  else
   if(rear<9)
{
  queue[++rear] = val;
}
else
{
  printf("queue is full");
}
 }
if(ch == 2)
 {
   if(front<=rear)
printf("%d",queue[front+1]);
 }
if(ch == 3)
 {
   for(i=front;i<=rear;i++)
printf("%d",queue[i]);
 }
if(ch == 4)
 {
  exit(0);
 }while(1)
 getch();
}