basic interactive readf from stdin

[Adam D. Ruppe via Digitalmars-d-learn]

On Saturday, 26 December 2015 at 19:40:59 UTC, Jay Norwood wrote:
> Simple VS console app in D.

If you are running inside visual studio, you need to be aware 
that output will be block buffered, not line buffered, because VS 
pipes the output making the program think it is talking to 
another program instead of to an interactive console (well, 
because it is!)

Add a stdout.flush(); after writing to force it to show 
immediately. I really think the read functions ought to flush 
output too because this is such a FAQ. (indeed, my terminal.d 
does flush output when you request input)