13-binary_tree_nodes.c

#include "binary_trees.h"
/**
 * binary_tree_nodes - a function that counts the nodes with
 * at least 1 child in a binary tree
 *
 * @tree: a pointer to the root node of the tree to count
 * the number of nodes
 *
 * Return: if null return 0
 */

size_t binary_tree_nodes(const binary_tree_t *tree)
{
	if (!tree)
	{
		return (0);
	}

	if (tree->left != NULL || tree->right != NULL)
	{
		return (binary_tree_nodes(tree->left) + binary_tree_nodes(tree->right) + 1);
	}

	return (0);
}