C++ printf with %f but localized for the user's country

问题

I'm using the following C++ syntax to output a floating point value on a Windows platform:

printf("%.2f", 1.5);

It works well if I run it on an English user account. My assumption was that if I run it on, say French user account, the output will be 1,50 instead of 1.50.

Why do I not see it and how to produce my desired result?

回答1:

The radix character (i.e. '.' or ',') is defined by the current locale. The default locale (at least for Windows systems) is "C", which defines '.' as radix character.

You can set the current locale for a C/C++ program using the setlocale function.

To set the locale to the current system/user locale, you can use the following statement:

#include <locale.h>
setlocale(LC_ALL, ".OCP");

See here (cf. the examples on the linked page...) for more information about setlocale

回答2:

Try using setlocale() function http://www.cplusplus.com/reference/clibrary/clocale/setlocale/

来源：https://stackoverflow.com/questions/7684014/c-printf-with-f-but-localized-for-the-users-country