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: A pointer to the root node of the tree to count the number of leaves.
 *
 * Return: The number of nodes with at least 1 child in the binary tree if not
 * NULL, otherwise 0.
 */
size_t binary_tree_nodes(const binary_tree_t *tree)
{
	if (tree == NULL)
		return (0);

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

	return (binary_tree_nodes(tree->left) + binary_tree_nodes(tree->right));
}