Program to insert and delete items in circular queue

/* Program to insert and delete items in circular queue */
#include<stdio.h>
#include<conio.h>
void main()
{
 int F=0,R=0,N=3,X,Q[10],choice;
 clrscr();
 start:
 printf("Enter your choice 1.Insert 2.Delete 3.Exit:");
 scanf("%d",&choice);
 if(choice==1)
 {
	if((R+1==F)||(F==1 && R==N))
	{
		printf("Queue Overflow.\n");
	}
	else
	{
		printf("Enter the item to be inserted:");
		scanf("%d",&X);
		if(R==N)
		{
			R=1;
		}
		else
		{
			R++;
		}
		Q[R]=X;
		if(F==0)
		{
			F=1;
		}
	}
 goto start;
 }
 else if(choice==2)
 {
	if(F==0)
	{
		printf("Queue Underflow.\n");
	}
	else
	{
		X=Q[F];
		printf("The deleted item is %d.\n",X);
		if(F==R)
		{
			F=R=0;
		}
		else if(F==N)
		{
			F=1;
		}
		else
		{
			F++;
		}
	}
 goto start;
 }
 else
 {
	printf("The program for insertion and deletion in circular queue ends here.");
 }
 getch();
}

/* Output
Enter your choice 1.Insert 2.Delete 3.Exit:2
Queue Underflow.
Enter your choice 1.Insert 2.Delete 3.Exit:1
Enter the item to be inserted:5
Enter your choice 1.Insert 2.Delete 3.Exit:1
Enter the item to be inserted:6
Enter your choice 1.Insert 2.Delete 3.Exit:1
Enter the item to be inserted:7
Enter your choice 1.Insert 2.Delete 3.Exit:2
The deleted item is 5.
Enter your choice 1.Insert 2.Delete 3.Exit:2
The deleted item is 6.
Enter your choice 1.Insert 2.Delete 3.Exit:1
Enter the item to be inserted:3
Enter your choice 1.Insert 2.Delete 3.Exit:1
Enter the item to be inserted:5
Enter your choice 1.Insert 2.Delete 3.Exit:1
Queue Overflow.
Enter your choice 1.Insert 2.Delete 3.Exit:3
The program for insertion and deletion in circular queue ends here.
	  */