Switch Variant

using System;

class CurrencyConverter
{
    static void Main(string[] args)
    {
        decimal amount = decimal.Parse(Console.ReadLine());
        string inputCurrency = Console.ReadLine();
        string outputCurrency = Console.ReadLine();

        switch (inputCurrency)
        {
            case "USD":
                amount *= 1.79549m;
                break;
            case "EUR":
                amount *= 1.95583m;
                break;
            case "GBP":
                amount *= 2.53405m;
                break;
        }

        switch (outputCurrency)
        {
            case "USD":
                amount /= 1.79549m;
                break;
            case "EUR":
                amount /= 1.95583m;
                break;
            case "GBP":
                amount /= 2.53405m;
                break;
        }

        string result = $"{amount:F2} {outputCurrency}";
        Console.WriteLine(result);
    }
}