Answer 1

1. No, it's a generic input box. It only show you how inputs are supposed to be written there (on separate lines). Most online code processors require inputs this way, more efficient. Although there are some online code processors that simulate interactive I/O, it still feels awkward to use, especially on mobile devices.

2. Also no (read ASR's response)

Answer 2

I didn't understood your first questions write description with example.
Second question there is no such library in standard cpp for popup or alert you can give a message via cout or you can configure any third party libraries Linar moon , SDL sfml