Consider the following statements and answer the questions that follow them:

$1.$ bool ok;

$2.$ QString ageStr $=$ QInputDialog::getText$(0,$ "Age Input", "Enter your age:"$)$;

$3.$ int age $=$ ageStr.toInt$($&ok$)$;

$4.$ if $(!$ok $||$ age $<13||$ age $>19)\{$

$5.$ QMessageBox::warning$(0,$"Input Error", "Error in input"$)$;

$6.$ exit$(1)$;

$7.\}$

$1$ Explain in detail the effect of lines $2,3,4$ and $5$ of the above code. $(6)$

$2$ The getInt$()$ function would be better than getText$()$ in this context. Explain why, and write a single statement using getInt$()$ that could be used to replace all the above statements. $(4)$