Circle Calculator Help

[Alexander]

On Tuesday, 26 June 2012 at 14:53:33 UTC, Adam D. Ruppe wrote:
> You should be able to just do a readln() before exiting
> to give the user a chance to read everything, and hit
> enter to exit.

I just tried that, and it still closed right after I typed the 
radius.
It looks almost like error code that pops up, but it closes so 
fast there's no way I could possibly read it.