public class Rubl { public String rubel(final double coast) { double ost = coast % 100; if ((11 <= ost) && (ost < 19)) { return "рублей"; } ost = ost % 10; if ((5 <= ost) && (ost <= 9)) { return "рублей"; } if ((2 <= ost) && (ost <= 4)) { return "рубля"; } if ((1 <= ost) && (ost < 2)) { return "рубль"; } return "рублей"; } }