dlgt

using System;

namespace dlgt
{
	delegate void LoggerDelegate(int a, int b, int p);

	class DataHandler
	{
		public void DoOperation (int a, int b, LoggerDelegate d)
		{
			d(a, b, a*b);
		}
	}

	class MainClass
	{
		static void LogToStdOut (int a, int b, int p)
		{
			System.Console.WriteLine("{0} * {1} = {2}", a, b, p);
		}

		public static void Main (string[] args)
		{
			DataHandler dh = new DataHandler();

			dh.DoOperation(2, 3, LogToStdOut);
		}
	}
}