/**
* Main program.
*
* @param array $args Command-line arguments.
* @return integer Zero on success; non-zero on failure.
*/
public static function main($args)
{
printf("DigraphAsMatrix main program.\n");
$status = 0;
$g = new DigraphAsMatrix(4);
AbstractDigraph::test($g);
$g->purge();
AbstractDigraph::testWeighted($g);
$g->purge();
return $status;
}