public class Formatter { public static String formatTotalCost(double totalCost, int numberOfPeople) { double costPerPerson = totalCost / numberOfPeople; int rubles = (int) Math.floor(costPerPerson); int kopecks = (int) Math.round((costPerPerson - rubles) * 100); String formattedCost = String.valueOf((int) Math.floor(costPerPerson)); formattedCost += " "; if (rubles % 100 >= 11 && rubles % 100 <= 19) { formattedCost += "рублей"; } else { switch (rubles % 10) { case 1: formattedCost += "рубль"; break; case 2: case 3: case 4: formattedCost += "рубля"; break; default: formattedCost += "рублей"; } } if (kopecks != 0) { formattedCost += " " + kopecks + " копеек"; } return formattedCost; } }