Given the following class, which of the following statements are invalid?

$\backslash$table$[[$Java $/$ C#$],[$class House $\{],[$public int square$\_$footage;$],[$public int stories;$],[$public House$()\{],[$square$\_$footage$=0$;$],[$stories$=1$;$],[\}.],[$public House$($int sf$,$ int s$)\{],[$square$\_$footage$=$sf:$],[$stories$=$s;$],[?]]$