19.	Rewrite the following code:
function assign_value($num)
{
 // accepts numbers 1 – 6
 switch($num)
 {
 case "1":
 $rand_value = "a";
 break;
 case "2":
 $rand_value = "b";
			break;
		case "3":
			$rand_value = "c";
			break;
		case "4":
			$rand_value = "d";
			break;
		case "5":
			$rand_value = "e";
			break;
		case "6":
			$rand_value = "f";
			break;
	}
	return $rand_value;
}