11-binary_tree_size.c

#include "binary_trees.h"
/**
 * binary_tree_size - function that measures the size of a binary tree
 * @tree:  a pointer to the root node of the tree to measure the size
 *
 * Return: 0 if tree is NULL
 */
size_t binary_tree_size(const binary_tree_t *tree)
{
	size_t left, right;

	if (!tree)
	{
		return (0);
	}
	left = binary_tree_size(tree->left);
	right = binary_tree_size(tree->right);

	return (1 + left + right);
}