using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var (loanAppType, loanClass) = Program.Mapp("Holao","chao");

        Console.WriteLine(loanAppType + "  " + loanClass);

        var any = StrinFunction("Home Equity");

        Console.WriteLine(any.ToString());

        Console.WriteLine(Diff(1.234, x => x * 456.1234).ToString());

    Console.WriteLine(Diff(5, MyFunctionMethod).ToString());

    }

    static (string hola, string bye) Mapp(string in1, string in2)

    {

        var hola = in1;

        var bye = in2;

        return (hola, bye);

    }

    static bool StrinFunction( string in2)

    {

        var test = "Consumer,Home Equity";

        if ( test.Trim().ToUpper().Contains(in2.Trim().ToUpper())) 

            return true;

        return false;

    }

    public delegate double MyFunction1(double x);

​

static double Diff(double x, MyFunction1 f)

{

    double h = 2;

​

    return (f(x + h) - f(x)) / h;

}

​

static double MyFunctionMethod(double x)

{

    // Can add more complicated logic here

    return x + 10;

}

}