namespace point{class Program{public class greetings{public static void EnglishGreeting(){Console.WriteLine("Hello World!");}public static void SpanishGreeting(){Console.WriteLine("Ciao,mondo!");}public static void ItaliamGreeting(){Console.WriteLine("Hola,imundo!");}delegate void greetingdele();class hello{static void Main(string[] args){int iChoice = int.Parse (args[0]);greetingdele[] deletest ={new greetingdele (greetings.ItaliamGreeting),new greetingdele (greetings .EnglishGreeting),new greetingdele (greetings .SpanishGreeting)};deletest[iChoice -1]();}}}}}問題1：int.Parse(args[0])這句是什么意思？問題2：deletest[iChoice-1]（）是怎么一一訪問到委托數組的元素的？問題3：Main方法里的參數 string[] args 有什么用？