<html lang="en"> <head> <title>Mixed Declarations - Using the GNU Compiler Collection (GCC)</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using the GNU Compiler Collection (GCC)"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="C-Extensions.html#C-Extensions" title="C Extensions"> <link rel="prev" href="Cast-to-Union.html#Cast-to-Union" title="Cast to Union"> <link rel="next" href="Function-Attributes.html#Function-Attributes" title="Function Attributes"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1988-2015 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being ``Funding Free Software'', the Front-Cover Texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled ``GNU Free Documentation License''. (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Mixed-Declarations"></a> <p> Next: <a rel="next" accesskey="n" href="Function-Attributes.html#Function-Attributes">Function Attributes</a>, Previous: <a rel="previous" accesskey="p" href="Cast-to-Union.html#Cast-to-Union">Cast to Union</a>, Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a> <hr> </div> <h3 class="section">6.30 Mixed Declarations and Code</h3> <p><a name="index-mixed-declarations-and-code-3031"></a><a name="index-declarations_002c-mixed-with-code-3032"></a><a name="index-code_002c-mixed-with-declarations-3033"></a> 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: <pre class="smallexample"> int i; /* <span class="roman">...</span> */ i++; int j = i + 2; </pre> <p>Each identifier is visible from where it is declared until the end of the enclosing block. </body></html>