Program to implement Operations of Queue

void main()
{
int a[10],front,rear,item,ch,i;
clrscr();
front=-1;
rear=-1;
while(1)
{
printf("\n\t\t****MENU****\n");
printf("\n 1.Insert\n 2.Delete\n 3.Display \n 4.Exit");
printf("\n\n Enter your Choice :");
scanf("%d",&ch);
switch(ch)
{
case 1:
if(rear==9)
{
printf("\nQueue is full\n");
}
else
{
rear=rear+1;
printf("\n Enter the item you want to insert:");
scanf("%d",&item);
a[rear]=item;
}
break;
case 2:
if(front==rear)
{
printf("\n queue is empty\n");
}
else
{
front++;
printf("\n Deleted:%d",a[front]);

}

break;
case 3:
for(i=front+1;i<=rear;i++)
{
printf("\n %d",a[i]);
}
break;
case 4:
exit();
}//switch
}//while
}//main