How to convert numbers to words(million) in java?

Question

In less than 100 lines, How can I convert numbers to words using java? I can only see tutorials and answers up to 99,999 and I want it up to 999,999,99. Can anyone help me?

Answer 1

I'm not sure I correctly understand the problem : do you want to convert an integer to a string, using the comma separator for the thousands ?

If so, formatting works, whatever the number of digits (well as long as it doesn't exceed int range), for example :
int num = 1000000000;
String num_string = String.format("%,d",num);
System.out.println(num_string);

will print 1,000,000,000.

If you're looking for another type of simple formatting, you can look up this site, it's a good summary of available options :

https://www.novixys.com/blog/java-string-format-examples/

If I didn't understand your problem, could you give a more precise example ?

dhm

Answer 2

I mean how can I convert a larger digit(million). I can only see on yotube and stack overflow, converting up to 99,999. For example

this is the output

enter a positive integer: 9,000, 000
nine million

Answer 3

Ok I get it now, and I've looked at the code you put on the playground.

To expand it for numbers > 99999, I would replace this part :

else if(number<20000)
{
return units[number/1000] + " Thousand " + ((number%1000>0)? convert(number%1000):"");
}
return tens[number/10000] + ((number%10000>0)? convert(number%10000):"Thousand" );

with this :

else if(number<1000000)
{
return convert(number/1000) + " Thousand" + ((number%1000>0)? " " + convert(number%1000):"");
}
return convert(number/1000000) + " Million" + ((number%1000000>0)? " " + convert(number%1000000):"");

In my opinion : you don't need to bother with lines to manage the thousands (in your code, the <20k and <99999 are dealt with separately) : since you have defined the beahavior for 0 to hundred, rely on the recursion of your convert function to deal with the different cases. Hence the first else if.

Then deal with the >=1million case : just use the same call to the convert function for the million part and rely on recursion again. Then call it for the number%1000000 part if it isn't 0.

Tell me if something's not clear in the explanation or if once again I haven't understood your problem.

Edit : Based on your code, I've put the version implementing my modifications in public view under the name java_int_in_words, if it helps clarify what I'm saying