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authorCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
committerCraig Jennings <c@cjennings.net>2025-08-14 22:58:58 -0500
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- <h1 id="firstHeading" class="firstHeading">fputwc, putwc</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code>&lt;wchar.h&gt;</code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td> <pre data-language="c">wint_t fputwc( wchar_t ch, FILE* stream );</pre>
-</td> <td> (1) </td> <td> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> </tr> <tr class="t-dcl"> <td> <pre data-language="c">wint_t putwc( wchar_t ch, FILE* stream );</pre>
-</td> <td> (2) </td> <td> <span class="t-mark-rev t-since-c95">(since C95)</span> </td> </tr> </table> <p>Writes a wide character <code>ch</code> to the given output stream <code>stream</code>.</p>
-<div class="t-li1">
-<span class="t-li">2)</span> May be implemented as a macro and may evaluate <code>stream</code> more than once.</div> <h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> ch </td> <td> - </td> <td> wide character to be written </td>
-</tr> <tr class="t-par"> <td> stream </td> <td> - </td> <td> the output stream </td>
-</tr>
-</table> <h3 id="Return_value"> Return value</h3> <p>Returns a copy of <code>ch</code> on success.</p>
-<p>On failure, returns <code>WEOF</code> and sets the <i>error</i> indicator (see <code><a href="ferror" title="c/io/ferror">ferror()</a></code>) on <code>stream</code>.</p>
-<p>If an encoding error occurred, additionally sets <code><a href="../error/errno" title="c/error/errno">errno</a></code> to <code><a href="../error/errno_macros" title="c/error/errno macros">EILSEQ</a></code>.</p>
-<h3 id="Example"> Example</h3> <div class="t-example"> <div class="c source-c"><pre data-language="c">#include &lt;errno.h&gt;
-#include &lt;locale.h&gt;
-#include &lt;stdio.h&gt;
-#include &lt;stdlib.h&gt;
-#include &lt;wchar.h&gt;
-
-int main(void)
-{
- setlocale(LC_ALL, "en_US.utf8");
-
- errno = 0;
- if (fputwc(L'🍌', stdout) == WEOF)
- {
- if (errno == EILSEQ)
- puts("Encoding error in fputwc.");
- else
- puts("I/O error in fputwc.");
- return EXIT_FAILURE;
- }
-}</pre></div> <p>Possible output:</p>
-<div class="text source-text"><pre data-language="c">🍌</pre></div> </div> <h3 id="References"> References</h3> <ul>
-<li> C23 standard (ISO/IEC 9899:2023): </li>
-<ul>
-<li> 7.31.3.3 The fputwc function (p: 430) </li>
-<li> 7.31.3.8 The putwc function (p: 431-432) </li>
-</ul>
-<li> C17 standard (ISO/IEC 9899:2018): </li>
-<ul>
-<li> 7.29.3.3 The fputwc function (p: 308) </li>
-<li> 7.29.3.8 The putwc function (p: 310) </li>
-</ul>
-<li> C11 standard (ISO/IEC 9899:2011): </li>
-<ul>
-<li> 7.29.3.3 The fputwc function (p: 422-423) </li>
-<li> 7.29.3.8 The putwc function (p: 424) </li>
-</ul>
-<li> C99 standard (ISO/IEC 9899:1999): </li>
-<ul>
-<li> 7.24.3.3 The fputwc function (p: 368) </li>
-<li> 7.24.3.8 The putwc function (p: 370) </li>
-</ul>
-</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="fputc" title="c/io/fputc"> <span class="t-lines"><span>fputc</span><span>putc</span></span></a></div> </td> <td> writes a character to a file stream <br> <span class="t-mark">(function)</span> </td>
-</tr> <tr class="t-dsc"> <td> <div><a href="fputws" title="c/io/fputws"> <span class="t-lines"><span>fputws</span></span></a></div>
-<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div> </td> <td> writes a wide string to a file stream <br> <span class="t-mark">(function)</span> </td>
-</tr> <tr class="t-dsc"> <td> <div><a href="fgetwc" title="c/io/fgetwc"> <span class="t-lines"><span>fgetwc</span><span>getwc</span></span></a></div>
-<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div> </td> <td> gets a wide character from a file stream <br> <span class="t-mark">(function)</span> </td>
-</tr> <tr class="t-dsc"> <td colspan="2"> <span><a href="https://en.cppreference.com/w/cpp/io/c/fputwc" title="cpp/io/c/fputwc">C++ documentation</a></span> for <code>fputwc</code> </td>
-</tr> </table> <div class="_attribution">
- <p class="_attribution-p">
- &copy; cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
- <a href="https://en.cppreference.com/w/c/io/fputwc" class="_attribution-link">https://en.cppreference.com/w/c/io/fputwc</a>
- </p>
-</div>