What is the mistake in the second alert statement in the code?

function func$1($n$)$

$\{$

if $(n==0)$

return $0$;

else

return $($n$+$func$1(n-1)$;

$\}$

function func$2($n$,$ result$)$

$\{$

if $(n==0)$

return result;

else

return $($n$+$func$2($n$-1,$ n$+$result$))$;

$\}$

alert $("$output of func$2(4,0)$ is $"+$ func$2(4,0))$;

alert $("$output of func$1$ is $"+$ func$1(4,0))$ ;