public class Formatter { static void formatter() { double amountPerPerson = Calculator.totalAmount / Main.numberOfPersons; String rub; if (10 < (int) amountPerPerson % 100 && (int) amountPerPerson % 100 < 15) { rub = "рублей"; } else { int lastDigit = (int) amountPerPerson % 10; switch (lastDigit) { case 1: rub = "рубль"; break; case 2: case 3: case 4: rub = "рубля"; break; default: rub = "рублей"; break; } } String amountPerPersonLine = String.format("%.2f", amountPerPerson); System.out.println("Каждый человек должен заплатить: " + amountPerPersonLine + " " + rub); } }