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 of the tree to count the number of nodes
 * Return: n of nodes with child. If tree is NULL, return 0.
 * A NULL pointer is not a node
 **/

size_t binary_tree_nodes(const binary_tree_t *tree)
{
	size_t nodes = 0;

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