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import java.util.*;
public class EXF_38
{
public static Scanner input = new Scanner(System.in);
public static class BTNode
{
protected int key;
protected BTNode left, right;
public BTNode()
{
key = 0; left = right = null;
}
public BTNode(int i)
{
this(i,null,null);
}
public BTNode(int i, BTNode l, BTNode r)
{
key = i; left = l; right = r;
}
}
public static class BT
{
protected BTNode root = null;
public BT() { }
public void preorder() { preorder(root); }
protected void preorder(BTNode n)
{
if (n != null)
{
visit(n);
preorder(n.left);
preorder(n.right);
}
}
public void inorder() { inorder(root); }
protected void inorder(BTNode n)
{
if (n != null)
{
inorder(n.left);
visit(n);
inorder(n.right);
}
}
public void postorder() { postorder(root); }
protected void postorder(BTNode n)
{
if (n != null)
{
postorder(n.left);
postorder(n.right);
visit(n);
}
}
protected void visit(BTNode n)
{
System.out.println(n.key + " ");
}
public void addChild(BTNode p,BTNode n)
{
}
}
public static void main(String[] args)
{
BT bt = new BT();
char choice, again;
for(;;)
{
System.out.printf("nMain menunA. Insert NodenB. PreordernC. postordernD. InordernE. ExitnChoice: ");
choice= input.next().charAt(0);
if((choice=='a')||(choice=='A'))
{
}
else if((choice=='b')||(choice=='B'))
{
System.out.print("Preorder: ");
bt.preorder();
System.out.print("Back to Main: ");
again= input.next().charAt(0);
if ((again=='y')||(again=='Y'))
{
continue;
}
else
{
break;
}
}
else if((choice=='C')||(choice=='c'))
{
System.out.print("Postorder: ");
bt.postorder();
System.out.print("Back to Main: ");
again= input.next().charAt(0);
if ((again=='y')||(again=='Y'))
{
continue;
}
else
{
break;
}
}
else if((choice=='D')||(choice=='d'))
{
System.out.print("Inorder: ");
bt.inorder();
System.out.print("Back to Main: ");
again= input.next().charAt(0);
if ((again=='y')||(again=='Y'))
{
continue;
}
else
{
break;
}
}
else if((choice=='E')||(choice=='e'))
{
System.out.print("GoodBye!!!");
break;
}
else
{
System.out.printf("nWrong Input!!!");
continue;
}
}
}
}
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