package javacodebook.core.writtennumber;

public class EnglishNumber implements WrittenNumber {

    int number;

    private static final String []EINER = {
        "zero", "one", "two", "three", "four", "five",
        "six", "seven", "eight", "nine", "ten", "eleven",
        "twelve", "thirteen", "fourteen", "fifteen",
        "sixteen", "seventeen", "eighteen", "nineteen"
    };

    private static final String []ZEHNER = {
        "","","twenty", "thirty", "fourty", "fivety",
        "sixty", "seventy", "eighty", "ninety"
    };

    public EnglishNumber(int number) {
        this.number = number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public String toString() {
        if (number == 0)
            return "zero";
        else if (number == 1)
            return "one";
        else {
            StringBuffer buf = new StringBuffer();
            lessMillion(buf, number);
            return buf.toString();
        }
    }

    private void less100(StringBuffer buf, int number) {
        if (number == 0)
            return;
        else if (number < 20)
            buf.append(EINER[number]);
        else if (number%10 == 0){
            buf.append(ZEHNER[number/10]);
        } else {
            buf.append(ZEHNER[number/10]);
            buf.append(" ");
            buf.append(EINER[number%10]);
        }
    }

    private void less1000(StringBuffer buf, int number) {
        if (number < 100) {
            less100(buf, number);
        } else if (number%100 == 0) {
            buf.append(EINER[number/100]);
            buf.append(" hundred");
        } else {
            buf.append(EINER[number/100]);
            buf.append(" hundred ");
            less100(buf, number%100);
        }
    }

    private void lessMillion(StringBuffer buf, int number) {
        if (number < 1000) {
            less1000(buf, number);
        } else {
            less1000(buf, number/1000);
            buf.append(" thousand ");
            less1000(buf, number%1000);
        }
    }
}

--- Neue Klasse ---

package javacodebook.core.writtennumber;

public class GermanNumber implements WrittenNumber {

    int number;

    private static final String []EINER = {
        "null", "ein", "zwei", "drei", "vier", "fünf",
        "sechs", "sieben", "acht", "neun", "zehn", "elf",
        "zwölf", "dreizehn", "vierzehn", "fünfzehn",
        "sechszehn", "siebzehn", "achtzehn", "neunzehn"
    };

    private static final String []ZEHNER = {
        "","","zwanzig", "dreissig", "vierzig", "fünfzig",
        "sechzig", "siebzig", "achtzig", "neunzig"
    };

    public GermanNumber(int number) {
        this.number = number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public String toString() {
        if (number == 0)
            return "null";
        else if (number == 1)
            return "eins";
        else {
            StringBuffer buf = new StringBuffer();
            lessMillion(buf, number);
            return buf.toString();
        }
    }

    private void less100(StringBuffer buf, int number) {
        if (number == 0)
            return;
        else if (number == 1)
            buf.append("eins");
        else if (number < 20)
            buf.append(EINER[number]);
        else if (number%10 == 0){
            buf.append(ZEHNER[number/10]);
        } else {
            buf.append(EINER[number%10]);
            buf.append("und");
            buf.append(ZEHNER[number/10]);
        }
    }

    private void less1000(StringBuffer buf, int number) {
        if (number < 100) {
            less100(buf, number);
        } else if (number%100 == 0) {
            buf.append(EINER[number/100]);
            buf.append("hundert");
        } else {
            buf.append(EINER[number/100]);
            buf.append("hundert ");
            less100(buf, number%100);
        }
    }

    private void lessMillion(StringBuffer buf, int number) {
        if (number < 1000) {
            less1000(buf, number);
        } else if (number < 2000) {
            buf.append("ein tausend ");
            less1000(buf, number%1000);
        } else {
            less1000(buf, number/1000);
            buf.append(" tausend ");
            less1000(buf, number%1000);
        }
    }
}

--- Neue Klasse ---


package javacodebook.core.writtennumber;

public class RomanNumber implements WrittenNumber {

    private int n;

    public RomanNumber(int number) throws Exception {
        setNumber(number);
    }

    public void setNumber(int number) throws Exception {
        if ((number <0) || (number > 5000))
            throw new Exception("number out of range");
        this.n = number;
    }

    public String toString() {
        if (n == 0)
            return "";
        StringBuffer b = new StringBuffer("");
        while (n >= 1000) { b.append("M");  n -= 1000;}
        if (n >= 900)     { b.append("CM"); n -= 900; }
        if (n >= 500)     { b.append("D");  n -= 500; }
        if (n >= 400)     { b.append("CD"); n -= 400; }
        while (n >= 100)  { b.append("C");  n -= 100; }
        if (n >= 90)      { b.append("XC"); n -= 90; }
        if (n >= 50)      { b.append("L");  n -= 50; }
        if (n >= 40)      { b.append("XL"); n -= 40; }
        while (n >= 10)   { b.append("X");  n -= 10; }
        if (n >= 9)       { b.append("IX"); n -= 9; }
        if (n >= 5)       { b.append("V");  n -= 5; }
        if (n >= 4)       { b.append("IV"); n -= 4; }
        while (n > 0)     { b.append("I");  n -= 1; }
        return b.toString();
    }
}

--- Neue Klasse ---

package javacodebook.core.writtennumber;

import java.text.DateFormat;
import java.util.Calendar;

public class Starter {

    public static void main(String []args) throws Exception {
        WrittenNumber r = new RomanNumber(0);
        WrittenNumber g = new GermanNumber(0);
        WrittenNumber e = new EnglishNumber(0);
        for (int i=1; i<24; i++)
        {
            r.setNumber(i);
            g.setNumber(i);
            e.setNumber(i);
            System.out.println("" + i + " " + r + "\t" + g + "\t" + e);
        }
    }
}