C# Program to Call Math Operations using Delegates

Code:

using System;
public class MathOperations
{
    public static double Multiply(double value)
    {
        return value * 2;
    }

    public static double Square(double value)
    {
        return value * value;
    }
}


delegate double DoubleOp(double x);

class Application
{
    static void Main()
    {
        DoubleOp[] operations =
            {
               MathOperations.Multiply,
               MathOperations.Square
            };

        for (int i = 0; i < operations.Length; i++)
        {
            Console.WriteLine("Operation[{0}]:", i);
            ProcessAndDisplayNumber(operations[i], 5.0);
            ProcessAndDisplayNumber(operations[i], 13.55);
            ProcessAndDisplayNumber(operations[i], 1.732);
            Console.WriteLine();
        }
        Console.ReadLine();
    }

    static void ProcessAndDisplayNumber(DoubleOp action, double value)
    {
        double result = action(value);
        Console.WriteLine(
           "Value : {0}  Result : {1}", value, result);
    }
}


Output:

Operation[0]:
Value : 5  Result : 10
Value : 13.55  Result : 27.1
Value : 1.732  Result : 3.464

Operation[1]:
Value : 5  Result : 25
Value : 13.55  Result : 183.6025
Value : 1.732  Result : 2.999824


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