NumberAsWords

package com.company.homeworkConditionalStatements;

import java.util.Scanner;

public class Problem11_NumberAsWords {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int number = Integer.parseInt(scan.nextLine());

        int units = 0; // _ _ X -ones' place
        int tens = 0; // _ X X -tens' place
        int hundreds = 0; // X X X -hundreds' place
        String numberAsWord = ""; // result

        if (number >= 0 && number <= 9) {
            units = number % 10;
            switch (units) {
                case 0: numberAsWord = "Zero";break;
                case 1: numberAsWord = "One";break;
                case 2: numberAsWord = "Two";break;
                case 3: numberAsWord = "Three";break;
                case 4: numberAsWord = "Four";break;
                case 5: numberAsWord = "Five";break;
                case 6: numberAsWord = "Six";break;
                case 7: numberAsWord = "Seven";break;
                case 8: numberAsWord = "Eight";break;
                case 9: numberAsWord = "Nine";break;
            }
        }
        if (number >= 10 && number <= 19) {
            units = number % 10;
            switch (units) {
                case 0: numberAsWord = "Ten";break;
                case 1: numberAsWord = "Eleven";break;
                case 2: numberAsWord = "Twelve";break;
                case 3: numberAsWord = "Thirteen";break;
                case 4: numberAsWord = "Fourteen";break;
                case 5: numberAsWord = "Fifteen";break;
                case 6: numberAsWord = "Sixteen";break;
                case 7: numberAsWord = "Seventeen";break;
                case 8: numberAsWord = "Eighteen";break;
                case 9: numberAsWord = "Nineteen";break;
            }
        }
        if (number >= 20 && number <= 99) {
            tens = (number / 10) % 10;
            units = number % 10;
            switch (units) {
                case 0: numberAsWord = "";break;
                case 1: numberAsWord = "one";break;
                case 2: numberAsWord = "two";break;
                case 3: numberAsWord = "three";break;
                case 4: numberAsWord = "four";break;
                case 5: numberAsWord = "five";break;
                case 6: numberAsWord = "six";break;
                case 7: numberAsWord = "seven";break;
                case 8: numberAsWord = "eight";break;
                case 9: numberAsWord = "nine";break;
            }
            switch (tens) {
                case 2: numberAsWord = "Twenty " + numberAsWord;break;
                case 3: numberAsWord = "Thirty " + numberAsWord;break;
                case 4: numberAsWord = "Forty " + numberAsWord;break;
                case 5: numberAsWord = "Fifty " + numberAsWord;break;
                case 6: numberAsWord = "Sixty " + numberAsWord;break;
                case 7: numberAsWord = "Seventy " + numberAsWord;break;
                case 8: numberAsWord = "Eighty " + numberAsWord;break;
                case 9: numberAsWord = "Ninety " + numberAsWord;break;
            }
        }
        if (number >= 100 && number <= 999) {
            hundreds = (number / 100) % 10;
            tens = (number / 10) % 10;
            units = number % 10;
            switch (units) {
                case 0: numberAsWord = "";break;
                case 1: numberAsWord = "one";break;
                case 2: numberAsWord = "two";break;
                case 3: numberAsWord = "three";break;
                case 4: numberAsWord = "four";break;
                case 5: numberAsWord = "five";break;
                case 6: numberAsWord = "six";break;
                case 7: numberAsWord = "seven";break;
                case 8: numberAsWord = "eight";break;
                case 9: numberAsWord = "nine";break;
            }
            switch (tens) {
                case 0:
                    if (units != 0) {
                        numberAsWord = "and " + numberAsWord;
                    } else {
                        numberAsWord = "" + numberAsWord;
                    }
                    break;
                case 1:
                    switch (units) {
                        case 0: numberAsWord = "and ten";break;
                        case 1: numberAsWord = "and eleven";break;
                        case 2: numberAsWord = "and twelve";break;
                        case 3: numberAsWord = "and thirteen";break;
                        case 4: numberAsWord = "and fourteen";break;
                        case 5: numberAsWord = "and fifteen";break;
                        case 6: numberAsWord = "and sixteen";break;
                        case 7: numberAsWord = "and seventeen";break;
                        case 8: numberAsWord = "and eighteen";break;
                        case 9: numberAsWord = "and nineteen";break;
                    } break;
                case 2: numberAsWord = "and twenty " + numberAsWord;break;
                case 3: numberAsWord = "and thirty " + numberAsWord;break;
                case 4: numberAsWord = "and forty " + numberAsWord;break;
                case 5: numberAsWord = "and fifty " + numberAsWord;break;
                case 6: numberAsWord = "and sixty " + numberAsWord;break;
                case 7: numberAsWord = "and seventy " + numberAsWord;break;
                case 8: numberAsWord = "and eighty " + numberAsWord;break;
                case 9: numberAsWord = "and ninety " + numberAsWord;break;
            }
            switch (hundreds) {
                case 1: numberAsWord = "One hundred " + numberAsWord;break;
                case 2: numberAsWord = "Two hundred " + numberAsWord;break;
                case 3: numberAsWord = "Three hundred " + numberAsWord;break;
                case 4: numberAsWord = "Four hundred " + numberAsWord;break;
                case 5: numberAsWord = "Five hundred " + numberAsWord;break;
                case 6: numberAsWord = "Six hundred " + numberAsWord;break;
                case 7: numberAsWord = "Seven hundred " + numberAsWord;break;
                case 8: numberAsWord = "Eight hundred " + numberAsWord;break;
                case 9: numberAsWord = "Nine hundred " + numberAsWord;break;
            }
        }
        System.out.println(numberAsWord);
    }
}