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    <p>This was fun. It has the following issues:</p> <p>-Only deals with integers. No longs, doubles etc.<BR> -Doesn't deal with the single case of zero.<BR> -Fails at Integer.MIN_VALUE because of the number = number * -1<BR></p> <p>Otherwise, it seems to work. The motivation was that I can't stand huge blocks of "if-else" code. </p> <pre><code>public class NumbersToWords { private static final Map&lt;Integer,String&gt; NUM_TO_WORD = new HashMap&lt;Integer, String&gt;(); private static final List&lt;Integer&gt; KEYS = new ArrayList&lt;Integer&gt;(30); static { NUM_TO_WORD.put(0,"zero"); NUM_TO_WORD.put(1,"one"); NUM_TO_WORD.put(2,"two"); NUM_TO_WORD.put(3,"three"); NUM_TO_WORD.put(4,"four"); NUM_TO_WORD.put(5,"five"); NUM_TO_WORD.put(6,"six"); NUM_TO_WORD.put(7,"seven"); NUM_TO_WORD.put(8,"eight"); NUM_TO_WORD.put(9,"nine"); NUM_TO_WORD.put(10,"ten"); NUM_TO_WORD.put(11,"eleven"); NUM_TO_WORD.put(12,"twelve"); NUM_TO_WORD.put(13,"thirteen"); NUM_TO_WORD.put(14,"fourteen"); NUM_TO_WORD.put(15,"fifteen"); NUM_TO_WORD.put(16,"sixteen"); NUM_TO_WORD.put(17,"seventeen"); NUM_TO_WORD.put(18,"eighteen"); NUM_TO_WORD.put(19,"nineteen"); NUM_TO_WORD.put(20,"twenty"); NUM_TO_WORD.put(30,"thirty"); NUM_TO_WORD.put(40,"forty"); NUM_TO_WORD.put(50,"fifty"); NUM_TO_WORD.put(60,"sixty"); NUM_TO_WORD.put(70,"seventy"); NUM_TO_WORD.put(80,"eighty"); NUM_TO_WORD.put(90,"ninety"); NUM_TO_WORD.put(100,"hundred"); NUM_TO_WORD.put(1000,"thousand"); NUM_TO_WORD.put(1000000,"million"); NUM_TO_WORD.put(1000000000,"billion"); KEYS.addAll(NUM_TO_WORD.keySet()); Collections.sort(KEYS); } public static void main(String[] args){ int[] testValues = {24,4,543755,12,10000,123000,123,Integer.MAX_VALUE, -456}; NumbersToWords ntw = new NumbersToWords(); for(int i : testValues){ System.out.println(i + " -&gt; " + ntw.getWords(i)); } } /* called recursively */ public String getWords(int number){ boolean isNegative = number &lt; 0; if(isNegative){ number = number * -1; } if(number &lt; 100){ return getWordLessThanHundred(number); } StringBuilder words = new StringBuilder(50); int key = getKey(number); if(isNegative){ words.append("negative "); } words.append(getWords(number/key)) .append(" ").append(NUM_TO_WORD.get(key)) // get the largest placeholder word .append(" ").append(getWords(number % key)); // get the rest return words.toString(); } private String getWordLessThanHundred(int number){ if(number == 0){ return ""; } if(number &lt; 21){ return NUM_TO_WORD.get(number); } int key = getKey(number); return NUM_TO_WORD.get(key) + " " + NUM_TO_WORD.get(number - key); } private int getKey(int number){ for(int i = 0; i&lt;KEYS.size();i++){ int value = KEYS.get(i); if(i &gt; 0 &amp;&amp; number &lt; value){ return KEYS.get(i - 1); }else if(number == value){ return value; } } return KEYS.get(KEYS.size() - 1); } } </code></pre>
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    1. POHow can I output the hundred and teens numbers in words in my program
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