102 lines
4.2 KiB
HTML
102 lines
4.2 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): Mixed Declarations</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Mixed Declarations">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Mixed Declarations">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">
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<link href="Function-Attributes.html#Function-Attributes" rel="next" title="Function Attributes">
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<link href="Cast-to-Union.html#Cast-to-Union" rel="prev" title="Cast to Union">
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Mixed-Declarations"></a>
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<div class="header">
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<p>
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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> [<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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</div>
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<hr>
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<a name="Mixed-Declarations-and-Code"></a>
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<h3 class="section">6.30 Mixed Declarations and Code</h3>
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<a name="index-mixed-declarations-and-code"></a>
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<a name="index-declarations_002c-mixed-with-code"></a>
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<a name="index-code_002c-mixed-with-declarations"></a>
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<p>ISO C99 and ISO C++ allow declarations and code to be freely mixed
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within compound statements. As an extension, GNU C also allows this in
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C90 mode. For example, you could do:
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</p>
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<div class="smallexample">
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<pre class="smallexample">int i;
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/* <span class="roman">…</span> */
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i++;
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int j = i + 2;
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</pre></div>
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<p>Each identifier is visible from where it is declared until the end of
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the enclosing block.
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</p>
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</body>
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</html>
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