Why "cout << x" is there ?

Question

Wrong java challenge?
https://code.sololearn.com/c3xwGea0gK68/?ref=app

Answer 1

then it's wrong
we can't use c++ function in Java
lol

Answer 2

that's wrong
it is there to tell you that instead of cout<<x
you use system.out.printn(x) which is commented out there

Answer 3

well I believe there is so many wrong answers in challenges and so many wrong written questions, including this cout<<x