13-binary_tree_nodes.c

#include "binary_trees.h"

/**
 * binary_tree_nodes - counts the nodes with at least 1 child in a binary tree
 * @tree: pointer to the root node of the tree to count the number of nodes
 *
 * Return: number of internal nodes in size_t
 */
size_t binary_tree_nodes(const binary_tree_t *tree)
{
	if (tree == NULL || (!tree->left && !tree->right))
		return (0);
	return (1 + binary_tree_nodes(tree->left)
			+ binary_tree_nodes(tree->right));
}