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<title>Using the GNU Compiler Collection (GCC): Mixed Declarations</title>

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<a name="Mixed-Declarations"></a>
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<p>
Next: <a href="Function-Attributes.html#Function-Attributes" accesskey="n" rel="next">Function Attributes</a>, Previous: <a href="Cast-to-Union.html#Cast-to-Union" accesskey="p" rel="prev">Cast to Union</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Mixed-Declarations-and-Code"></a>
<h3 class="section">6.29 Mixed Declarations and Code</h3>
<a name="index-mixed-declarations-and-code"></a>
<a name="index-declarations_002c-mixed-with-code"></a>
<a name="index-code_002c-mixed-with-declarations"></a>

<p>ISO C99 and ISO C++ allow declarations and code to be freely mixed
within compound statements.  As an extension, GNU C also allows this in
C90 mode.  For example, you could do:
</p>
<div class="smallexample">
<pre class="smallexample">int i;
/* <span class="roman">&hellip;</span> */
i++;
int j = i + 2;
</pre></div>

<p>Each identifier is visible from where it is declared until the end of
the enclosing block.
</p>


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