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<html lang="en"><head><title>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 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>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 }--></style></head><body><div class="node"><p>Node: <a name="Subscripting">Subscripting</a>,Next: <a rel="next" accesskey="n" href="Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>,Previous: <a rel="previous" accesskey="p" href="Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>,Up: <a rel="up" accesskey="u" href="C-Extensions.html#C%20Extensions">C Extensions</a><hr><br></div><h3 class="section">Non-Lvalue Arrays May Have Subscripts</h3><p>In ISO C99, arrays that are not lvalues still decay to pointers, andmay be subscripted, although they may not be modified or used afterthe next sequence point and the unary <code>&</code> operator may not beapplied to them. As an extension, GCC allows such arrays to besubscripted in C89 mode, though otherwise they do not decay topointers outside C99 mode. For example,this is valid in GNU C though not valid in C89:<pre class="smallexample"> struct foo {int a[4];}; struct foo f(); bar (int index) { return f().a[index]; } </pre> </body></html>⌨️ 快捷键说明
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