Yes or No Options

[Alex via Digitalmars-d]

Hey guys!

I am super new to programming and still trying to learn the very 
basics via a book that I bought.

My problem is the following:



import std.stdio;
import std.string;


void main()
{
	char[] yesno;

	write("Roll the dice: Enter a number!");
	int dieNumber;
	readf(" %s", &dieNumber);

	if (dieNumber < 4) {
	writeln("You won!");
	}
	else if ((dieNumber >= 4) && (dieNumber <= 6)) {
		writeln("I won!");
	}
	else if (dieNumber > 6){
		writeln("ERROR: Invalid Value");
	}

	writeln("Do you want to play again? Y/N?");
	readln(yesno);
	if (yesno == "Y") {
		writeln("Let's go again!");
	}

}


The program quits after "writeln("Do you want to play again? 
Y/N?");"
It ignores readln.

Furthermore: What I am actually trying to do is: If I type "Y", 
the programm should just rerun from the beginning.

I am really new to programming and there is probably a much 
easier way but this is all I know to this point.

Thanks in advance!