what is the output in C$++2.$ void doSomething$($int&$)$;

int main$()$

$\{$

int x $=2$;

cout $<<$ x $<<$ endl;

doSomething$($x$)$;

cout $<<$ x $<<$ endl;

return $0$;

$\}$

void doSomething$($int& num$)$

$\{$

num $=0$;

cout $<<$ num $<<$ endl;

$\}$