CurrencyConverter

import java.util.Scanner;

/**
 * Created by Raly on 21.12.2016 г..
 */
public class CurrencyConvertor {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);

//        System.out.println(); // sout
//        System.out.printf("%s", "foo"); // souf

        System.out.print("Enter number: ");
        double inputMoney = Double.parseDouble(reader.nextLine());
        System.out.print("Enter input currency: ");
        String inputCurrency = reader.nextLine();
        System.out.print("Enter output currency: ");
        String outputCurrency = reader.nextLine();

        double bgnUsd = 1.79549;
        double bgnEur = 1.95583;
        double bgnGbp = 2.53405;
        double vInBgn = 1.0;
        double output = 1.0;

        // 1 step -> convert input amount  money in leva
        if (inputCurrency.equals("USD")){
            vInBgn = inputMoney * bgnUsd;
        }
        else if(inputCurrency.equals("EUR")){
            vInBgn = inputMoney * bgnEur;
        }
        else if(inputCurrency.equals("GBP")){
            vInBgn = inputMoney * bgnGbp;
        }
        else if (inputCurrency.equals("BGN")){
            vInBgn = inputMoney;
        }
        else{
            System.out.println("Invalid input");
        }

        // 2 step -> convert into output currency
        if (outputCurrency.equals("USD")){
            output = vInBgn / bgnUsd;
        }
        else if(outputCurrency.equals("EUR")){
            output = vInBgn / bgnEur;
        }
        else if (outputCurrency.equals("GBP")){
            output = vInBgn / bgnGbp;
        }
        else if (outputCurrency.equals("BGN")){
            output = vInBgn;
        }
        else{
            System.out.println("Invalid input");
        }

        System.out.printf("%.2f %s", output, outputCurrency);
    }
}