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std:: fputwc

From cppreference.net
< cpp ‎ | io ‎ | c
C++
Input/output library
C-style I/O
Defined in header <cwchar>
std:: wint_t fputwc ( wchar_t ch, std:: FILE * stream ) ;
(1)
std:: wint_t putwc ( wchar_t ch, std:: FILE * stream ) ;
(2)

Writes a wide character ch to the given output stream stream .

2) May be implemented as a macro and may evaluate stream more than once.

Contents

Parameters

ch - wide character to be written
stream - the output stream

Return value

ch on success, WEOF on failure. If an encoding error occurs, errno is set to EILSEQ .

Example

Run this code 
#include <cerrno>
#include <clocale>
#include <cstdio>
#include <cstdlib>
#include <cwchar>
#include <initializer_list>
int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    for (const wchar_t ch :
    {
        L'\u2200', // Unicode name: "FOR ALL"
        L'\n',
        L'∀',
    })
    {
        if (errno = 0; std::fputwc(ch, stdout) == WEOF)
        {
            std::puts(errno == EILSEQ
                ? "Encoding error in fputwc"
                : "I/O error in fputwc"
            );
            return EXIT_FAILURE;
        }
    }
    return EXIT_SUCCESS;
}

Possible output: 

∀
∀

See also

writes a character to a file stream
(function)
writes a wide string to a file stream
(function)
gets a wide character from a file stream
(function)
C documentation for fputwc