public class Formatter { public static String getEnding(float cost) { int roundAmount = (int) Math.floor(cost); if (roundAmount % 100 >= 11 && roundAmount % 100 <= 19) { return "рублей"; } int lastDig = roundAmount % 10; switch (lastDig) { case 1: return "рубль"; case 2: case 3: case 4: return "рубля"; default: return "рублей"; } } }