#include <wchar.h>
   wint_t fputwc(wchar_t, FILE *);

fputwc writes a single wide-character to the stream at the position of the file pointer and advances the pointer.
If the write was successful, the character that was written is returned. Otherwise, the function returns WEOF.

/* 
 * fputwc example code
 * http://code-reference.com/c/wchar.h/fputwc 
 */
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
#include <wchar.h>
#include <locale.h>
 
int main( void )
{
    setlocale(LC_ALL,"");
    wchar_t string[] = L"fputwc example for code-reference.com ÖÄÜß\n";
 
    int i = 0;
    while (string[i] != 0) {
        if (fputwc(string[i], stdout) == WEOF) {
            return 1;
        }
        ++i;
    }
    return 0;
}

  
  ./fputwc
  fputwc example for code-reference.com ÖÄÜß