public static void Main()
Console.WriteLine("\n1");
Console.WriteLine("\n2");
Console.WriteLine("\n3");
Console.WriteLine("\n nhap vao thong tin ban muon hien thi ");
Console.WriteLine("\n ban vua nhap vao " + Console.ReadLine());
Console.WriteLine("\n nhap vao mot ky tu bat ky !");
Console.WriteLine("\n ky tu ban vua nhap co ma ASSCII la: " + Console.Read());
Console.WriteLine("\n chuc ban hoc tot !!!");