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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/io/fputwc.html below:

fputwc, putwc - cppreference.com

wint_t fputwc( wchar_t ch, FILE* stream ); (1) (since C95) wint_t putwc( wchar_t ch, FILE* stream ); (2) (since C95)

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.

[edit] Parameters ch - wide character to be written stream - the output stream [edit] Return value

Returns a copy of ch on success.

On failure, returns WEOF and sets the error indicator (see ferror()) on stream.

If an encoding error occurred, additionally sets errno to EILSEQ.

[edit] Example

#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
 
int main(void)
{
    setlocale(LC_ALL, "en_US.utf8");
 
    errno = 0;
    if (fputwc(L'ð', stdout) == WEOF)
    {
        if (errno == EILSEQ)
            puts("Encoding error in fputwc.");
        else
            puts("I/O error in fputwc.");
        return EXIT_FAILURE;
    }
}

Possible output:

[edit] References

C23 standard (ISO/IEC 9899:2024):

7.31.3.3 The fputwc function (p: 430)

7.31.3.8 The putwc function (p: 431-432)

C17 standard (ISO/IEC 9899:2018):

7.29.3.3 The fputwc function (p: 308)

7.29.3.8 The putwc function (p: 310)

C11 standard (ISO/IEC 9899:2011):

7.29.3.3 The fputwc function (p: 422-423)

7.29.3.8 The putwc function (p: 424)

C99 standard (ISO/IEC 9899:1999):

7.24.3.3 The fputwc function (p: 368)

7.24.3.8 The putwc function (p: 370)

[edit] See also

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