std::fputwc

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Input/output library

I/O manipulators

Print functions (C++23)

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

strstreambuf (deprecated in C++98)

basic_syncbuf (C++20)

Streams

Abstractions

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I/O

basic_ifstream

basic_ofstream

basic_fstream

String I/O

basic_istringstream

basic_ostringstream

basic_stringstream

Array I/O

basic_ispanstream (C++23)

basic_ospanstream (C++23)

basic_spanstream (C++23)

istrstream (deprecated in C++98)

ostrstream (deprecated in C++98)

strstream (deprecated in C++98)

Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

 

C-style I/O

Types and objects
FILE fpos_t	stdinstdoutstderr
Functions
File access fopen freopen fclose fflush fwide setbuf setvbuf Direct input/output fread fwrite Unformatted input/output fgetcgetc fgets fputcputc fputs getchar gets (until C++14) putchar puts ungetc fgetwcgetwc fgetws fputwcputwc fputws getwchar putwchar ungetwc Formatted input scanffscanfsscanf vscanfvfscanfvsscanf (C++11)(C++11)(C++11)     wscanffwscanfswscanf vwscanfvfwscanfvswscanf (C++11)(C++11)(C++11)	Formatted output printffprintfsprintfsnprintf (C++11) vprintfvfprintfvsprintfvsnprintf (C++11)     wprintffwprintfswprintf vwprintfvfwprintfvswprintf File positioning ftell fgetpos fseek fsetpos rewind Error handling clearerr feof ferror perror Operations on files remove rename tmpfile tmpnam

 

Defined in header <cwchar>
std::wint_t fputwc( wchar_t ch, std::FILE* stream );
std::wint_t putwc( wchar_t ch, std::FILE* stream );

Writes a wide character ch to the given output stream stream. putwc() may be implemented as a macro and may evaluate stream more than once.

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 <clocale>
#include <cstdio>
#include <cstdlib>
#include <cwchar>
#include <cerrno>
#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'∀',
    })
    {
        errno = 0;
        if (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

fputcputc	writes a character to a file stream (function)
fputws	writes a wide string to a file stream (function)
fgetwcgetwc	gets a wide character from a file stream (function)