What does this code do$?$

Scanner fileIn$=$ new Scanner$($new File$("$fileIn$.$txt$"))$;

int count $=0$;

while $($fileIn$.$hasNextLine$())\{$

String str $=$ fileIn.nextLine$().$trim$()$;

if $($str$.$indexof$(\text{'}?\text{'})>=0)\{$

count$++$;

$\}$

$\}$

System.out.print$($count$)$;