using System;

class Program

{

static int [] a = new int [] {10, 30, 20};

public delegate void F();

public static void R() {Array.Reverse (a); }

public static void S() {Array.Sort (a); }

public static void M() {int buf = a [0]; a [0] = a [a.Length - 1]; a [a.Length - 1] = buf; }

static void Main ()

{

F f = new F (R); f + = S; f - = R; f - = S; f();

for (int i = 0; i

}

}

C# oop_class