text: #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  typedef struct tree
  {
  	int data;
  	struct tree *left;
  	struct tree *right;
  } tree;
  
  tree * createTree()
  {
  	tree *t;
  	t = (tree *) malloc(sizeof(tree));
  	t->data = -1;
  	t->left = NULL;
  	t->right = NULL;
  	return t;
  }