using System;
 
namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            //
            Console.WriteLine("FxVersion: " + typeof(string).Assembly.ImageRuntimeVersion);
            Console.WriteLine("OsVersion: {0}", Environment.OSVersion.ToString());
            //
            string aSet = "F" + (char)769 + (char)768 + (char)803;
            Console.WriteLine("aSet.Length = {0}", aSet.Normalize().Length);
            //
            string sUp = "\uD83D\uDC4D";
            Console.WriteLine("THUMBS UP SIGN: " + sUp);
            Console.WriteLine("sUp A: " + sUp.Length);
            Console.WriteLine("sUp B: " + sUp.Normalize().Length); 
            //viết xâu bằng mã unicode tổ hợp
            string sToHop = "Xin chào tất cả các bạn";
            Console.WriteLine("sToHop toUpper: " + sToHop.ToUpper());
            Console.WriteLine("sToHop Length: " + sToHop.Length);
            //viết xâu bằng mã unicode dựng sẵn
            string sDungSan = "Xin chào tất cả các bạn";
            Console.WriteLine("sDungSan toUpper: " + sDungSan.ToUpper());
            Console.WriteLine("sDungSan Length: " + sDungSan.Length);
        }
    }
}

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