01.string words = "thai create 1 + 1 = 2";
02.string[] split = words.Split(' ');
03.foreach(string s in split)
04.{
05. int number;
06. if(Int32.TryParse(s, out number) == true)
07. {
08. Console.Write("Integer");
09. }
10. else if(s == "+" || s == "-")
11. {
12. Console.Write("Operand");
13. }
14. else
15. {
16. Console.Write("Identifier");
17. }
18.}
