콜백메소드

namespace ConsoleApp5 {

class Program {

delegate void CalcDelegate(int x, int y);

static void Callback(int x, int y, CalcDelegate dele) {

dele(x, y);

}

static void Plus(int x, int y) {Console.WriteLine(x + y);}

static void Minus(int x, int y) {Console.WriteLine(x - y);}

static void Multiple(int x, int y) {Console.WriteLine(x * y);}

static void Divide(int x, int y) {Console.WriteLine(x - y);}

static void Main(string[] args)

{

CalcDelegate plus = Plus;

CalcDelegate minus = Minus;

CalcDelegate multiple = Multiple;

CalcDelegate divide = Divide;

Callback(20, 10, plus);

Callback(20, 10, minus);

Callback(20, 10, multiple);

Callback(20, 10, divide);

}

}

}