Formatting large numbers (999,999,999)

[Jeff Sullivan, x4482 MS 14-13]

   Does anyone have a nice way to print out numbers with
   the correct placement of commas?

   For example:
	2,147,483,648
   instead of
	2147483648	/* using printf("%10.0f",x); */
			/*   where x is a double.    */

 Thanks in advance,

 Jeff Sullivan / Computervision/Prime \ {decvax|sun}!cvbnet!jsulliva
 CADDS R&D    / Bedford, MA      01730 \ jsulliva at cvbnet.prime.com
Jeff Sullivan / Computervision/Prime \ {decvax|linus|sun}!cvbnet!jsulliva
CADDS R&D    / Bedford, MA      01730 \ jsulliva at cvbnet.prime.com