#include<stdio.h>
#include<stdlib.h>
#include "tree_primitives.h"

tree_t cons_empty()
{
  return NULL; 
}

tree_t cons(s_base_t v, tree_t fg, tree_t fd)
{
  return NULL; 
}

int is_empty(tree_t a)
{
  return -1;
}

s_base_t value(tree_t a)
{
  s_base_t dummy =  {"",""};
  return dummy;
}

tree_t left(tree_t a)
{
  return NULL;
}

tree_t right(tree_t a)
{
  return NULL; 
}

void change_value(tree_t pa, s_base_t new_value)
{
}

void change_left(tree_t pa, tree_t new_left)
{
}

void change_right(tree_t pa, tree_t new_right)
{
}

void free_tree(tree_t a)
{
}

void prefix(tree_t a)
{
}

void graphical_print(tree_t a, int depth)
{
}


void graphical_print_link(tree_t a, int depth, int trace[])
{
}

int size(tree_t a)
{
  return -1;
}

int height(tree_t a)
{
  return -1;
}

int exists(tree_t a, s_base_t v)
{
  return -1;
}