public class RubFormat { public static String format(double input) { int ending = ((int) input); String rub = "рублей"; if (ending % 10 == 1) { rub = "рубль"; } if ((ending % 10 >= 2) && (ending % 10 <= 4)) { rub = "рубля"; } if ((ending % 100 >= 11) && (ending % 100 <= 20)) { rub = "рублей"; } return rub; } }