#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void ins(struct tree **,struct tree *);
void pre(struct tree *);
void in(struct tree *);
void post(struct tree *);
struct tree
{
int data;
struct tree*right,*left;
}
*root=NULL;
void main(void)
{ int x;
clrscr();
do
{
cout<<"\n1..............ins";
cout<<"\n2..............pre";
cout<<"\n3..............in";
cout<<"\n4..............post";
cout<<"\n5..............exit";
cin>>n;
switch(n)
{
case 1:
{
struct tree *curr;
curr=new tree;
curr->left=NULL;
curr->right=NULL;
cout<<"\nenter data:";
cin>>curr->ID;
ins(&root,curr);
break;
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