typedef struct element
{
	labeltype label;
	struct element *left,*right;
} bt;

typedef struct element *node;
typedef struct element *bTree;

node p; 

node RootB(bTree T)
{
	return T;
};

node LeftChildB(node n, bTree T)
{
	return n->left;
};

node RightChildB(node n, bTree T)
{
	return n->right;
};

labeltype LabelB(node n, bTree T)
{
	return n->label;
};

int ExistsLeftChild(node n, bTree T)
{
    if (n->left == NULL)
        return 0;
    else
        return 1;
};

int ExistsRightChild(node n, bTree T)
{
    if (n->right == NULL)
        return 0;
    else
        return 1;
};

void ChangeLabelB(labeltype x, node n, bTree T)
{
	n->label = x;
};

void CreateLeftB(labeltype x, node n, bTree T)
{
	element *tmp = new element;
	n->left = tmp;
	tmp->left = NULL;
	tmp->right = NULL;
	tmp->label = x;
};

void CreateRightB(labeltype x, node n, bTree T)
{
	element *tmp=new element;
	n->right = tmp;
	tmp->left = NULL;
	tmp->right = NULL;
	tmp->label = x;
};

void SearchParentInternal(node n, bTree T)
{
	if (LeftChildB(T,T) != NULL)
		if (T->left == n)
			p = T;
	else
		SearchParentInternal(n, T->left);
	if (RightChildB(T,T) != NULL)
		if (T->right == n)
			p = T;
	else
		SearchParentInternal(n, T->right);
};

node ParentB(node n, bTree T)
{
	SearchParentInternal(n,T);
	return p;
};

void DeleteB(node n, bTree T)
{
	node tmp;
	if (n != RootB(T))
	{
		tmp = ParentB(n,T);
		if(tmp->left == n)
			tmp->left = NULL;
		else
			tmp->right = NULL;
	}
	if(n->left != NULL)
		DeleteB(n->left, T);
	if(n->right != NULL)
		DeleteB(n->right, T);
	delete n;
};

void InitB(labeltype x, bTree T)
{
	T->label = x;
	T->left = NULL;
	T->right = NULL;
};

Zadatak 4 Implementacija binarnog stabla pomocu pokazivaca

C++