Question $2$

With regard to the following JavaScript program,

var x;

function sub$1()\{$

document.write$("$x $="+$ x $+"")$;

$\}$

function sub$20\{$

var x;

x$\}=10$

sub$10$;

$\}$

x$\}=5\backslash$mathrm$\{$ ;

sub$2()$;

If it is interpreted using static$-$scoping rules. What value of $x$ is displayed in

function sub$1?$ Why?

If it is under dynamic$-$scoping rules, what value of $x$ is displayed in function sub$1?$ Why?

With regard to the following JavaScript program,

function main$()\{$

function sub$10$

var x $=10$;

function sub$20\{$

var y $=$ x;

$\}$

function sub$30$

var x $=5$;

var x $=20$;

$\}$

If it is interpreted using static$-$scoping rules. What value of $x$ is displayed in

functions sub$1,$ sub$2,$ and sub$3$ respectively? Why?

If it is under dynamic$-$scoping rules, what value of x is displayed in functions sub$1,$ sub$2,$

and sub $3$ respectively? Why?