using System;

public class Program

{

    static void TypeMethod1()

    {

        Console.WriteLine("Day la method kieu void khong co tham so!");

    }

    static void TypeMethod2(string name)

    {

        Console.WriteLine("Day la method kieu void co tham so!");

        Console.WriteLine("Xin chao {0}!", name);

    }

    static void TypeMethod3(out string str){

        str = "STRING";

    }

    static void TypeMethod4(int a, int b, out int result)

    {

        result = 1;

        for (int i = 0; i < b; i++) {

            result *= a;

        }

    }

    public static void Main()

    {

        string str;

        int result;

        Console.WriteLine("TYPE 1");

        TypeMethod1();

        Console.WriteLine("\nTYPE 2");

        TypeMethod2("ZERO");

        Console.WriteLine("\nTYPE 3");

        TypeMethod3(out str);

        Console.WriteLine(str);

        Console.WriteLine("\nTYPE 4");

        TypeMethod4(4, 4, out result);

        Console.WriteLine(result);

    }

}