using System;

​

delegate double MathOperation(double x, double y);

​

class Program

{

    static void Main()

    {

        // Define some math operations

        MathOperation add = (x, y) => x + y;

        MathOperation subtract = (x, y) => x - y;

        MathOperation multiply = (x, y) => x * y;

​

        // Use the math operations

        double a = 5, b = 3;

        Console.WriteLine($"a + b = {add(a, b)}");

        Console.WriteLine($"a - b = {subtract(a, b)}");

        Console.WriteLine($"a * b = {multiply(a, b)}");

    }

}

​