using System;

public class Program

{

    public static void Main()

    {

        string currency; double amount;

        Console.WriteLine("please enter amount");

         amount = Convert.ToDouble(Console.ReadLine());

        Console.WriteLine("please enter currency");

         currency = Console.ReadLine();

        double newcurrency = conervtingcurrency(an);

        Console.WriteLine("the new currency is " + newcurrency );

    }

public static  Double conervtingcurrency(an){

    if(currency == "USD"{

        return amount = (1/1.21);

    }else{

        return amount * 1.21;

    }

    }

    }

​