Yes or No Options

[Tofu Ninja via Digitalmars-d-learn]

On Monday, 27 July 2015 at 16:48:00 UTC, Alex wrote:
> Okay. By pure trying I found out what I did wrong:
>
> Apparently by typing Y I entered the shift key. Could that have 
> been the problem?
> I changed it to a small y and it at least jumped back to the 
> commandline instead of just being stuck.
>
> And by changing:
>
> writeln("Do you want to play again? Y/N?");
> 	readln(yesno);
> 	if (yesno == "y") {
> 		writeln("Yeah!");
> 	}
>
> to:
>
> writeln("Do you want to play again? Y/N?");
> 	readln(yesno);
> 	if (yesno != "y") {
> 		writeln("Yeah!");
> 	}
>
> So instead of ==   I used  !=
>
> Now it works. But I still do not know why..

readln includes the '\n' at the end, so when you typed "Y" and 
pressed enter, readln returned "Y\n" which != "Y".