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<a name="putchar_002d_002d_002dwrite-a-character-_0028macro_0029"></a>
<h3 class="section">4.47 <code>putchar</code>&mdash;write a character (macro)</h3>
<a name="index-putchar"></a>
<a name="index-_005fputchar_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
int putchar(int <var>ch</var>);

int _putchar_r(struct _reent *<var>reent</var>, int <var>ch</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>putchar</code> is a macro, defined in <code>stdio.h</code>.  <code>putchar</code>
writes its argument to the standard output stream,
after converting it from an <code>int</code> to an <code>unsigned char</code>.
</p>
<p>The alternate function <code>_putchar_r</code> is a reentrant version.  The
extra argument <var>reent</var> is a pointer to a reentrancy structure.
</p>
<br>
<p><strong>Returns</strong><br>
If successful, <code>putchar</code> returns its argument <var>ch</var>.  If an error
intervenes, the result is <code>EOF</code>.  You can use &lsquo;<code>ferror(stdin)</code>&rsquo; to
query for errors.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>putchar</code>; it suggests, but does not require, that
<code>putchar</code> be implemented as a macro.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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