13-binary_tree_nodes.c

#include "binary_trees.h"
/**
  * binary_tree_nodes - counts the nodes in a binary tree
  * @tree: pointer to the root node of tree
  *
  * Return: number of nodes or 0
  */
size_t binary_tree_nodes(const binary_tree_t *tree)
{

	if (tree == NULL)
		return (0);

	if (tree->left || tree->right)
		return (1 + binary_tree_nodes(tree->left) + binary_tree_nodes(tree->right));

	return (0);
}