printf comma formatting question

[abubakarm]

Hi,
How can I write a number 123456 formatted as 123,456 using printf?

Regards,

...ab

[mliptak]

On Mar 28, 8:50 am, abubak...@gmail .com wrote:

Hi,
How can I write a number 123456 formatted as 123,456 using printf?

Regards,

..ab

like this?

int n = 123456;
printf("%d,%d", n / 1000, n % 1000);

[Jacek Dziedzic]

ab*******@gmail .com wrote:

Hi,
How can I write a number 123456 formatted as 123,456 using printf?

int d=123456;
printf("%d,%d", d/1000,d%1000);

Though if you intend to use it for numbers other than 123456,
you might want to use another power of 10 instead of 1000 and
make sure that the result of the modulo is positive.

HTH,
- J.

[James Kanze]

On Mar 28, 8:50 am, abubak...@gmail .com wrote:

How can I write a number 123456 formatted as 123,456 using printf?

By setting an appropriate locale. With printf, you have to
modify the global locale to do this, with all of the problems
inherent in modifying global data. You'd be better off using
ostream, where you can set a locale specific to the stream.

--
James Kanze (GABI Software) mailto:ja****** ***@gmail.com
Conseils en informatique orient?e objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place S?mard, 78210 St.-Cyr-l'?cole, France, [phone]

[abubakarm]

And how do I set the locale of a ostream and use it too ?

...ab

On Mar 28, 6:31 pm, "James Kanze" <james.ka...@gm ail.comwrote:

On Mar 28, 8:50 am, abubak...@gmail .com wrote:

How can I write a number 123456 formatted as 123,456 using printf?

By setting an appropriate locale. With printf, you have to
modify the global locale to do this, with all of the problems
inherent in modifying global data. You'd be better off using
ostream, where you can set a locale specific to the stream.

--
James Kanze (GABI Software) mailto:james.ka [e-mail]
Conseils en informatique orient?e objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place S?mard, 78210 St.-Cyr-l'?cole, France, [phone]

[Marcus Kwok]

Please trim signatures before replying, and do not top-post. I have
fixed it below.

ab*******@gmail .com wrote:

On Mar 28, 6:31 pm, "James Kanze" <james.ka...@gm ail.comwrote:

>On Mar 28, 8:50 am, abubak...@gmail .com wrote:

How can I write a number 123456 formatted as 123,456 using printf?

By setting an appropriate locale. With printf, you have to
modify the global locale to do this, with all of the problems
inherent in modifying global data. You'd be better off using
ostream, where you can set a locale specific to the stream.

And how do I set the locale of a ostream and use it too ?

I found this example somewhere (I don't remember where, but probably
this newsgroup).
#include <iostream>
#include <locale>
#include <string>

struct my_facet : public std::numpunct<c har{
explicit my_facet(size_t refs = 0) : std::numpunct<c har>(refs) {}
virtual char do_thousands_se p() const { return ','; }
virtual std::string do_grouping() const { return "\003"; }
};

int main()
{
std::locale global;
std::locale withgroupings(g lobal, new my_facet);
std::locale was = std::cout.imbue (withgroupings) ;
std::cout << 1000000 << std::endl;
std::cout.imbue (was);
return 0;
}
--
Marcus Kwok
Replace 'invalid' with 'net' to reply

[Jack Klein]

On 27 Mar 2007 23:50:34 -0700, ab*******@gmail .com wrote in
comp.lang.c++:

Hi,
How can I write a number 123456 formatted as 123,456 using printf?

Regards,

Two people have given you an incorrect answer roughly corresponding to
this:

int x = 123456; // assumes int has 16 bits, not guaranteed
printf("%d,%d", x / 1000, x % 1000);

....which will give you "123,456".

But if 'x' is 123001, they will output the obviously incorrect:
"123, 1".

The correct conversion specifier is "%d,%03d".

--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://c-faq.com/
comp.lang.c++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.l earn.c-c++
http://www.club.cc.cmu.edu/~ajo/docs/FAQ-acllc.html

[mliptak]

On Mar 29, 4:48 am, Jack Klein <jackkl...@spam cop.netwrote:

On 27 Mar 2007 23:50:34 -0700, abubak...@gmail .com wrote in
comp.lang.c++:

Hi,
How can I write a number 123456 formatted as 123,456 using printf?

Regards,

Two people have given you an incorrect answer roughly corresponding to
this:

int x = 123456; // assumes int has 16 bits, not guaranteed
printf("%d,%d", x / 1000, x % 1000);

...which will give you "123,456".

But if 'x' is 123001, they will output the obviously incorrect:
"123, 1".

oh, c'mon.. he was asking about 123456 :)

The correct conversion specifier is "%d,%03d".

[James Kanze]

On Mar 28, 3:46 pm, abubak...@gmail .com wrote:

And how do I set the locale of a ostream and use it too ?

ostream::imbue( ).

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[James Kanze]

On Mar 29, 4:48 am, Jack Klein <jackkl...@spam cop.netwrote:

On 27 Mar 2007 23:50:34 -0700, abubak...@gmail .com wrote in
comp.lang.c++:

How can I write a number 123456 formatted as 123,456 using printf?

Two people have given you an incorrect answer roughly corresponding to
this:

int x = 123456; // assumes int has 16 bits, not guaranteed
printf("%d,%d", x / 1000, x % 1000);

...which will give you "123,456".

But if 'x' is 123001, they will output the obviously incorrect:
"123, 1".

The correct conversion specifier is "%d,%03d".

Which fails for 1234567.

The correct solution is to use the appropriate locale.

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]