#ifndef BITREE_H
#define BITREE_H

#include<sstream>


class BiTree {
public:
    int data;
    BiTree *left;
    BiTree *right;

    static bool is_empty(BiTree *bt);

    static bool is_leaf(BiTree *bt);

    static int sum_leaf(BiTree *bt);

    static BiTree *createNode(int data);

    static void insertNode(BiTree *&bt, int value);

    std::string toString();
};


#endif //BITREE_H