number formatting using recursion
 

hi, i was wondering if anyone could help me out? i have this project in my java class where i need to format an integer to a string with commas (ex:1000000->1,000,000) using recursion. I've tried it for 4 class periods and i just can't figure it out. If you feel guilty by giving me just the answer feel free to give me a tutorial on recursion so that i get the answer and understand it better.
I figured some people woudl like to see what i have now.

static String insertCommas(int num)

{

         int rem=0;

         String str="";

        if(num<1000)

                        {

                        str+=num;  

                        return str;

                        }

                        else

                        {

                        str+=num+",";

                        insertCommas(num%1000);

                        }

                       return str;

}

Re: number formatting using recursion
 

why complicate things?

import java.text.NumberFormat;

.......

 static String insertCommas(int num)

{

                 return NumberFormat.getInstance().format(num);

}

Re: number formatting using recursion
 

I can help you, but I have school right now, but after I'll help you.