using System;
 
public class Test
{
	public static void Main()
	{
		// Code Point U+1F47E
		Console.WriteLine("\\U0001F47E = \U0001F47E");
		Console.WriteLine("");
		
		// Specifying the UTF-16 Surrogate Pair raises a "CS1009
		// Unrecognized escape sequence" error in LINQPad and Visual
		// Studio 2015.
		//
		// Here it returns the default replacement character due to ignoring
		// the first 4 hex digits and only seeing 0xDC7E, which is a
		// surrogate code unit.
		Console.WriteLine("\\UD83DDC7E = \UD83DDC7E");
		Console.WriteLine("");

		// The following is invalid, and raises an error in LINQPad and in
		// Visual Studio 2015. But here it returns an empty string due to
		// ignoring the first 4 hex digits and only seeing 0x0000.
		Console.WriteLine("\\UD83D0000 = \UD83D0000");
		Console.WriteLine("");
		
		// The following are invalid, and raises an error in LINQPad and in
		// Visual Studio 2015. But here it returns an "A" due to ignoring
		// the first 4 hex digits and only seeing 0x0041.
		Console.WriteLine("\\UD83D0041 = \UD83D0041");
		Console.WriteLine("\\U80000041 = \U80000041");
		Console.WriteLine("\\UFFFF0041 = \UFFFF0041");
		Console.WriteLine("");

		// The following is invalid, and raises an error HERE (as expected),
		// due to the first 4 hex digits being below the 0x8000 mark.
		//Console.WriteLine("\\U7FFF0041 = \U7FFF0041");
	}
}