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<h1 id="firstHeading" class="firstHeading">fputc, putc</h1> <table class="t-dcl-begin"> <tr class="t-dsc-header"> <th> Defined in header <code><stdio.h></code> </th> <th> </th> <th> </th> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">int fputc( int ch, FILE* stream );</pre>
</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl"> <td class="t-dcl-nopad"> <pre data-language="c">int putc( int ch, FILE* stream );</pre>
</td> <td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> </table> <p>Writes a character <code>ch</code> to the given output stream <code>stream</code>. <code>putc()</code> may be implemented as a macro and evaluate <code>stream</code> more than once, so the corresponding argument should never be an expression with side effects.</p>
<p>Internally, the character is converted to <code>unsigned char</code> just before being written.</p>
<h3 id="Parameters"> Parameters</h3> <table class="t-par-begin"> <tr class="t-par"> <td> ch </td> <td> - </td> <td> character to be written </td>
</tr> <tr class="t-par"> <td> stream </td> <td> - </td> <td> output stream </td>
</tr>
</table> <h3 id="Return_value"> Return value</h3> <p>On success, returns the written character.</p>
<p>On failure, returns <code><a href="../io" title="c/io">EOF</a></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>
<h3 id="Example"> Example</h3> <div class="t-example">
<p>Shows <code>putc</code> with error checking</p>
<div class="c source-c"><pre data-language="c">#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int ret_code = 0;
for (char c = 'a'; (ret_code != EOF) && (c != 'z'); c++)
ret_code = putc(c, stdout);
// Test whether EOF was reached.
if (ret_code == EOF && ferror(stdout))
{
perror("putc()");
fprintf(stderr, "putc() failed in file %s at line # %d\n",
__FILE__, __LINE__ - 7);
exit(EXIT_FAILURE);
}
putc('\n', stdout);
return EXIT_SUCCESS;
}</pre></div> <p>Output:</p>
<div class="text source-text"><pre data-language="c">abcdefghijklmnopqrstuvwxy</pre></div> </div> <h3 id="References"> References</h3> <ul>
<li> C23 standard (ISO/IEC 9899:2023): </li>
<ul>
<li> 7.21.7.3 The fputc function (p: TBD) </li>
<li> 7.21.7.7 The putc function (p: TBD) </li>
</ul>
<li> C17 standard (ISO/IEC 9899:2018): </li>
<ul>
<li> 7.21.7.3 The fputc function (p: TBD) </li>
<li> 7.21.7.7 The putc function (p: TBD) </li>
</ul>
<li> C11 standard (ISO/IEC 9899:2011): </li>
<ul>
<li> 7.21.7.3 The fputc function (p: 331) </li>
<li> 7.21.7.7 The putc function (p: 333) </li>
</ul>
<li> C99 standard (ISO/IEC 9899:1999): </li>
<ul>
<li> 7.19.7.3 The fputc function (p: 297) </li>
<li> 7.19.7.8 The putc function (p: 299) </li>
</ul>
<li> C89/C90 standard (ISO/IEC 9899:1990): </li>
<ul>
<li> 4.9.7.3 The fputc function </li>
<li> 4.9.7.8 The putc function </li>
</ul>
</ul> <h3 id="See_also"> See also</h3> <table class="t-dsc-begin"> <tr class="t-dsc"> <td> <div><a href="putchar" title="c/io/putchar"> <span class="t-lines"><span>putchar</span></span></a></div> </td> <td> writes a character to <code>stdout</code> <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/fputc" title="cpp/io/c/fputc">C++ documentation</a></span> for <code>fputc, putc</code> </td>
</tr> </table> <div class="_attribution">
<p class="_attribution-p">
© cppreference.com<br>Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.<br>
<a href="https://en.cppreference.com/w/c/io/fputc" class="_attribution-link">https://en.cppreference.com/w/c/io/fputc</a>
</p>
</div>
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