Simple formatting question

[gonzilla]

Hi,

I'm new to C. All I was wondering is if there was a simple way to format output with the printf() function to have a long number (floats or ints) use commas...

1000000.00 is instead printed 1,000,000.00

I'm thinking it may involve using strings or an array of the number and print a "," for every third index. What is the easiest way? Are there alternative ways?

Thanks for your help in advance.

-Tyler

 

[brudnakm]

How about brute force,

for a positive int:

#include <stdio.h>
#include <string.h>

typedef int bool ;

void printInt(int posInt) {
char intStr[12] ; /* holding buff for non-comma result */
int len ; /* length of the non-comma result */
int i ;

sprintf(intStr, &quot;%d&quot;, posInt) ;
len = strlen(intStr) ;
for (i = 0 ; i < len ; i++) {
int place ; /* current place N -- 1 */
bool onesPosition ; /* Test for end condition */
bool nextIsGroupOfThree ; /* is next char div by 3 */

place = len - i ;
putchar(intStr) ;

onesPosition = (place == 1) ; /* prevent &quot;123,456,&quot; */
nextIsGroupOfThree = (place % 3 == 1) ;

if (nextIsGroupOfThree && !onesPosition) {
putchar(',') ;
}
}
return ;
}

This should get you started. It can be easily extended for floats and negatives.

Hope this helps.

Brudnakm