Digit grouping in C's printf

c printf grouping digit
Gnubie picture Gnubie · May 15, 2012 · Viewed 10k times · Source

I wish to output large numbers with thousand-separators (commas or spaces) — basically the same as in How to display numeric in 3 digit grouping but using printf in C (GNU, 99).

If printf does not support digit grouping natively, how can I achieve this with something like printf("%s", group_digits(number))?

It must support negative integers and preferably floats, too.

Answer

pmg picture pmg · May 15, 2012

If you can use POSIX printf, try

#include <locale.h>
setlocale(LC_ALL, ""); /* use user selected locale */
printf("%'d", 1000000);

Related questions

Correct format specifier for double in printf

What is the correct format specifier for double in printf? Is it %f or is it %lf? I believe it's %f, but I am not sure. Code sample #include <stdio.h> int main() { double d = 1.4; printf("%lf", d); // …

Read More
Is there a printf converter to print in binary format?

I can print with printf as a hex or octal number. Is there a format tag to print as binary, or arbitrary base? I am running gcc. printf("%d %x %o\n", 10, 10, 10); //prints "10 A 12\n" print("%b\n", 10); // prints "%b\…

Read More
What is the argument for printf that formats a long?

The printf function takes an argument type, such as %d or %i for a signed int. However, I don't see anything for a long value.

Read More