Jason - 1 year ago 157
Java Question

# How to convert number to words in java

We currently have a crude mechanism to convert numbers to words (e.g. using a few static arrays) and based on the size of the number translating that into an english text. But we are running into issues for numbers which are huge.

10183 = Ten thousand one hundred eighty three
90 = Ninety
5888 = Five thousand eight hundred eighty eight

Is there an easy to use function in any of the math libraries which I can use for this purpose?

Here is the code, I don't think there is any method in SE.

It basically converts number to string and parses String and associates it with the weight

for example

1000

1 is treated as thousand position and 1 gets mapped to "one" and thousand because of position

This is the code from the website:

English

import java.text.DecimalFormat;

public class EnglishNumberToWords {

private static final String[] tensNames = {
"",
" ten",
" twenty",
" thirty",
" forty",
" fifty",
" sixty",
" seventy",
" eighty",
" ninety"
};

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

private EnglishNumberToWords() {}

private static String convertLessThanOneThousand(int number) {
String soFar;

if (number % 100 < 20){
soFar = numNames[number % 100];
number /= 100;
}
else {
soFar = numNames[number % 10];
number /= 10;

soFar = tensNames[number % 10] + soFar;
number /= 10;
}
if (number == 0) return soFar;
return numNames[number] + " hundred" + soFar;
}

public static String convert(long number) {
// 0 to 999 999 999 999
if (number == 0) { return "zero"; }

String snumber = Long.toString(number);

// pad with "0"
String mask = "000000000000";
DecimalFormat df = new DecimalFormat(mask);
snumber = df.format(number);

// XXXnnnnnnnnn
int billions = Integer.parseInt(snumber.substring(0,3));
// nnnXXXnnnnnn
int millions  = Integer.parseInt(snumber.substring(3,6));
// nnnnnnXXXnnn
int hundredThousands = Integer.parseInt(snumber.substring(6,9));
// nnnnnnnnnXXX
int thousands = Integer.parseInt(snumber.substring(9,12));

switch (billions) {
case 0:
break;
case 1 :
+ " billion ";
break;
default :
+ " billion ";
}
String result =  tradBillions;

switch (millions) {
case 0:
break;
case 1 :
+ " million ";
break;
default :
+ " million ";
}
result =  result + tradMillions;

switch (hundredThousands) {
case 0:
break;
case 1 :
tradHundredThousands = "one thousand ";
break;
default :
+ " thousand ";
}
result =  result + tradHundredThousands;

result =  result + tradThousand;

// remove extra spaces!
return result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " ");
}

/**
* testing
* @param args
*/
public static void main(String[] args) {
System.out.println("*** " + EnglishNumberToWords.convert(0));
System.out.println("*** " + EnglishNumberToWords.convert(1));
System.out.println("*** " + EnglishNumberToWords.convert(16));
System.out.println("*** " + EnglishNumberToWords.convert(100));
System.out.println("*** " + EnglishNumberToWords.convert(118));
System.out.println("*** " + EnglishNumberToWords.convert(200));
System.out.println("*** " + EnglishNumberToWords.convert(219));
System.out.println("*** " + EnglishNumberToWords.convert(800));
System.out.println("*** " + EnglishNumberToWords.convert(801));
System.out.println("*** " + EnglishNumberToWords.convert(1316));
System.out.println("*** " + EnglishNumberToWords.convert(1000000));
System.out.println("*** " + EnglishNumberToWords.convert(2000000));
System.out.println("*** " + EnglishNumberToWords.convert(3000200));
System.out.println("*** " + EnglishNumberToWords.convert(700000));
System.out.println("*** " + EnglishNumberToWords.convert(9000000));
System.out.println("*** " + EnglishNumberToWords.convert(9001000));
System.out.println("*** " + EnglishNumberToWords.convert(123456789));
System.out.println("*** " + EnglishNumberToWords.convert(2147483647));
System.out.println("*** " + EnglishNumberToWords.convert(3000000010L));

/*
*** zero
*** one
*** sixteen
*** one hundred
*** one hundred eighteen
*** two hundred
*** two hundred nineteen
*** eight hundred
*** eight hundred one
*** one thousand three hundred sixteen
*** one million
*** two millions
*** three millions two hundred
*** seven hundred thousand
*** nine millions
*** nine millions one thousand
*** one hundred twenty three millions four hundred
**      fifty six thousand seven hundred eighty nine
*** two billion one hundred forty seven millions
**      four hundred eighty three thousand six hundred forty seven
*** three billion ten
**/
}
}

Français Quite different than the english version but french is a lot more difficult!

package com.rgagnon.howto;

import java.text.*;

class FrenchNumberToWords {
private static final String[] dizaineNames = {
"",
"",
"vingt",
"trente",
"quarante",
"cinquante",
"soixante",
"soixante",
"quatre-vingt",
"quatre-vingt"
};

private static final String[] uniteNames1 = {
"",
"un",
"deux",
"trois",
"quatre",
"cinq",
"six",
"sept",
"huit",
"neuf",
"dix",
"onze",
"douze",
"treize",
"quatorze",
"quinze",
"seize",
"dix-sept",
"dix-huit",
"dix-neuf"
};

private static final String[] uniteNames2 = {
"",
"",
"deux",
"trois",
"quatre",
"cinq",
"six",
"sept",
"huit",
"neuf",
"dix"
};

private FrenchNumberToWords() {}

private static String convertZeroToHundred(int number) {

int laDizaine = number / 10;
int lUnite = number % 10;
String resultat = "";

case 1 :
case 7 :
case 9 :
lUnite = lUnite + 10;
break;
default:
}

// séparateur "-" "et"  ""
String laLiaison = "";
if (laDizaine > 1) {
laLiaison = "-";
}
// cas particuliers
switch (lUnite) {
case 0:
laLiaison = "";
break;
case 1 :
if (laDizaine == 8) {
laLiaison = "-";
}
else {
laLiaison = " et ";
}
break;
case 11 :
laLiaison = " et ";
}
break;
default:
}

// dizaines en lettres
case 0:
resultat = uniteNames1[lUnite];
break;
case 8 :
if (lUnite == 0) {
}
else {
+ laLiaison + uniteNames1[lUnite];
}
break;
default :
+ laLiaison + uniteNames1[lUnite];
}
return resultat;
}

private static String convertLessThanOneThousand(int number) {

int lesCentaines = number / 100;
int leReste = number % 100;
String sReste = convertZeroToHundred(leReste);

String resultat;
switch (lesCentaines) {
case 0:
resultat = sReste;
break;
case 1 :
if (leReste > 0) {
resultat = "cent " + sReste;
}
else {
resultat = "cent";
}
break;
default :
if (leReste > 0) {
resultat = uniteNames2[lesCentaines] + " cent " + sReste;
}
else {
resultat = uniteNames2[lesCentaines] + " cents";
}
}
return resultat;
}

public static String convert(long number) {
// 0 à 999 999 999 999
if (number == 0) { return "zéro"; }

String snumber = Long.toString(number);

// pad des "0"
String mask = "000000000000";
DecimalFormat df = new DecimalFormat(mask);
snumber = df.format(number);

// XXXnnnnnnnnn
int lesMilliards = Integer.parseInt(snumber.substring(0,3));
// nnnXXXnnnnnn
int lesMillions  = Integer.parseInt(snumber.substring(3,6));
// nnnnnnXXXnnn
int lesCentMille = Integer.parseInt(snumber.substring(6,9));
// nnnnnnnnnXXX
int lesMille = Integer.parseInt(snumber.substring(9,12));

switch (lesMilliards) {
case 0:
break;
case 1 :
+ " milliard ";
break;
default :
+ " milliards ";
}
String resultat =  tradMilliards;

switch (lesMillions) {
case 0:
break;
case 1 :
+ " million ";
break;
default :
+ " millions ";
}
resultat =  resultat + tradMillions;

switch (lesCentMille) {
case 0:
break;
case 1 :
tradCentMille = "mille ";
break;
default :
+ " mille ";
}
resultat =  resultat + tradCentMille;

resultat =  resultat + tradMille;

return resultat;
}

public static void main(String[] args) {
System.out.println("*** " + FrenchNumberToWords.convert(0));
System.out.println("*** " + FrenchNumberToWords.convert(9));
System.out.println("*** " + FrenchNumberToWords.convert(19));
System.out.println("*** " + FrenchNumberToWords.convert(21));
System.out.println("*** " + FrenchNumberToWords.convert(28));
System.out.println("*** " + FrenchNumberToWords.convert(71));
System.out.println("*** " + FrenchNumberToWords.convert(72));
System.out.println("*** " + FrenchNumberToWords.convert(80));
System.out.println("*** " + FrenchNumberToWords.convert(81));
System.out.println("*** " + FrenchNumberToWords.convert(89));
System.out.println("*** " + FrenchNumberToWords.convert(90));
System.out.println("*** " + FrenchNumberToWords.convert(91));
System.out.println("*** " + FrenchNumberToWords.convert(97));
System.out.println("*** " + FrenchNumberToWords.convert(100));
System.out.println("*** " + FrenchNumberToWords.convert(101));
System.out.println("*** " + FrenchNumberToWords.convert(110));
System.out.println("*** " + FrenchNumberToWords.convert(120));
System.out.println("*** " + FrenchNumberToWords.convert(200));
System.out.println("*** " + FrenchNumberToWords.convert(201));
System.out.println("*** " + FrenchNumberToWords.convert(232));
System.out.println("*** " + FrenchNumberToWords.convert(999));
System.out.println("*** " + FrenchNumberToWords.convert(1000));
System.out.println("*** " + FrenchNumberToWords.convert(1001));
System.out.println("*** " + FrenchNumberToWords.convert(10000));
System.out.println("*** " + FrenchNumberToWords.convert(10001));
System.out.println("*** " + FrenchNumberToWords.convert(100000));
System.out.println("*** " + FrenchNumberToWords.convert(2000000));
System.out.println("*** " + FrenchNumberToWords.convert(3000000000L));
System.out.println("*** " + FrenchNumberToWords.convert(2147483647));
/*
*** OUTPUT
*** zéro
*** neuf
*** dix-neuf
*** vingt et un
*** vingt-huit
*** soixante et onze
*** soixante-douze
*** quatre-vingt
*** quatre-vingt-un
*** quatre-vingt-neuf
*** quatre-vingt-dix
*** quatre-vingt-onze
*** quatre-vingt-dix-sept
*** cent
*** cent un
*** cent dix
*** cent vingt
*** deux cents
*** deux cent un
*** deux cent trente-deux
*** neuf cent quatre-vingt-dix-neuf
*** mille
*** mille un
*** dix mille
*** dix mille un
*** cent mille
*** deux millions
*** trois milliards
*** deux milliards cent quarante-sept millions
**          quatre cent quatre-vingt-trois mille six cent quarante-sept
*/
}
}

You can handle "dollar and cent" conversion by calling the "convert" method two times.

String phrase = "12345.67" ;
Float num = new Float( phrase ) ;
int dollars = (int)Math.floor( num ) ;
int cent = (int)Math.floor( ( num - dollars ) * 100.0f ) ;

String s = "\$ " + EnglishNumberToWords.convert( dollars ) + " and "
+ EnglishNumberToWords.convert( cent ) + " cents" ;

Another way to use a built-in function of your DBMS (if available). For Oracle

SQL> select to_char(to_date(873,'J'), 'JSP') as converted_form from dual;

CONVERTED_FORM
---------------------------
EIGHT HUNDRED SEVENTY-THREE

SQL>
'JSP' means :
J : the Julian format.
SP : spells the word for the number passed to to_date
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