clocale header file in C++

clocale: This header file contains declaration of a set of functions and a type for internationalization support tasks. It supports date format or country specific currency symbols. For example, date/time formatting, monetary formatting and many more. Methods in clocale header:

1. localeconv(): This function returns an object which represents numeric and monetary formatting rules of the current C locale. Its corresponding header file is . The "c" locale is the minimal locale. It is a locale which has the same settings across all the compilers, so the result is predictable anyway. By default used on all C programs. Prototype

   lconv* localeconv();
   

   Parameters: This method has no parameters. Return value: This function returns a pointer to a static object that contains numeric and monetary formatting rules of the current C locale. Program: CPP

   #include <iostream>
   #include <locale.h>
   using namespace std;
   
   int main()
   {
       setlocale(LC_MONETARY, "en_US.utf8");
       struct lconv* lc = localeconv();
       printf("%s ", lc->currency_symbol);
       return 0;
   }
   

   Output:

   $
   

2. setlocale(): The setlocale() function installs the specified system locale. Moreover, it sets the locale information for the current C program. It can also be used to query the current C locale. It has some parameters namely,
   • LC_ALL -> Selects all the C locale
   • LC_NUMERIC -> Selects numeric formatting category
   • LC_MONETARY -> Monetary formatting category
   • LC_CTYPE -> Character classification category
   • LC_TIME -> Time formatting category
   Prototype:

   int setlocale(int category, const char* locale);
   

   Return value: It returns a pointer to the string identifying the C locale after applying the changes. Otherwise, it returns a NULL pointer. Program: CPP

   #include <clocale>
   #include <iostream>
   using namespace std;
   
   int main()
   {
       char* s;
       setlocale(LC_ALL, "en_UA.utf8");
       s = setlocale(LC_ALL, NULL);
       cout << s << "\n";
       return 0;
   }
   

   Output:

   C