public class Formatter { public static String formatTotalCost(double totalCost) { String formattedTotalCost; int integerPart = (int) totalCost; int decimalPart = (int) ((totalCost - integerPart) * 100); if (integerPart % 10 == 1 && integerPart % 100 != 11) { formattedTotalCost = integerPart + "." + String.format("%02d", decimalPart) + " рубль"; } else if (integerPart % 10 >= 2 && integerPart % 10 <= 4 && (integerPart % 100 < 10 || integerPart % 100 >= 20)) { formattedTotalCost = integerPart + "." + String.format("%02d", decimalPart) + " рубля"; } else { formattedTotalCost = integerPart + "." + String.format("%02d", decimalPart) + " рублей"; } return formattedTotalCost; } }