25. MessageMap

using System;

delegate int CalcDelegate(int x, int y);
delegate void WorkDelegate(char arg1, int arg2, int arg3);

class MessageMap
{
	public char opCode;
	public CalcDelegate Calc;

	public MessageMap(char opCode, CalcDelegate Calc)
    {
		this.opCode = opCode;
		this.Calc = Calc;
    }
}

public class Mathematics
{
	MessageMap[] aMessageMap;

	static int Add(int x, int y) { return x + y; }
	static int Subtract(int x, int y) { return x - y; }
	static int Multiply(int x, int y) { return x * y; }
	static int Divide(int x, int y) { return x / y; }

	public Mathematics()
	{
		aMessageMap = new MessageMap[] {new MessageMap('+', Add), new MessageMap('-', Subtract)
									   ,new MessageMap('*', Multiply), new MessageMap('/', Divide)};
	}

	public void Calculate(char opCode, int operand1, int operand2)
	{
		Console.Write(opCode + " : ");
        foreach (MessageMap Temp in aMessageMap)
        {
			if(Temp.opCode == opCode)
            {
				Console.WriteLine(Temp.Calc(operand1, operand2));
			}
		}
	}
}

class Program
{
	static void Main(string[] args)
	{
		Mathematics math = new Mathematics();
		WorkDelegate work = math.Calculate;

		work('+', 10, 5);
		work('-', 10, 5);
		work('*', 10, 5);
		work('/', 10, 5);
	}
}

 

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