This example shows how to convert a Unicode character to lowercase.

#include <stdio.h>
#include <unidef.h>

int main(void) {

LocaleObject  locale_object;

UniChar       uni_upr = L'C';
UniChar       uni_lwr;
int           rc;


         /*****************************************************************/
         /* Assumes LANG environment variable set to a valid locale name, */
         /* such as fr_FR                                                 */
         /*****************************************************************/

         rc = UniCreateLocaleObject(UNI_UCS_STRING_POINTER,
                                   (UniChar *)L"", &locale_object);

         if (rc != ULS_SUCCESS) {
           printf("UniCreateLocaleObject error: return code = %u\n", rc);
           return 1;
         }

         uni_lwr = UniTransLower(locale_object, uni_upr);

         return (ULS_SUCCESS);


}