/** * Main program. * * @param array $args Command-line arguments. * @return integer Zero on success; non-zero on failure. */ public static function main($args) { printf("BinaryTree main program.\n"); $status = 0; $bt = new BinaryTree(box(4)); $bt->attachLeft(new BinaryTree(box(2))); $bt->attachRight(new BinaryTree(box(6))); AbstractTree::test($bt); return $status; }