95 lines
4.1 KiB
HTML
95 lines
4.1 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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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2016 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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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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 as: Symbol Intro</title>
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<meta name="description" content="Using as: Symbol Intro">
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<meta name="keywords" content="Using as: Symbol Intro">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Syntax.html#Syntax" rel="up" title="Syntax">
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<link href="Statements.html#Statements" rel="next" title="Statements">
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<link href="Comments.html#Comments" rel="prev" title="Comments">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.indentedblock {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nocodebreak {white-space:nowrap}
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span.nolinebreak {white-space:nowrap}
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span.roman {font-family:serif; font-weight:normal}
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span.sansserif {font-family:sans-serif; font-weight:normal}
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ul.no-bullet {list-style: none}
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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="Symbol-Intro"></a>
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<div class="header">
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<p>
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Next: <a href="Statements.html#Statements" accesskey="n" rel="next">Statements</a>, Previous: <a href="Comments.html#Comments" accesskey="p" rel="prev">Comments</a>, Up: <a href="Syntax.html#Syntax" accesskey="u" rel="up">Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Symbols-1"></a>
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<h3 class="section">3.4 Symbols</h3>
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<a name="index-characters-used-in-symbols"></a>
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<p>A <em>symbol</em> is one or more characters chosen from the set of all
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letters (both upper and lower case), digits and the three characters
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‘<samp>_.$</samp>’.
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On most machines, you can also use <code>$</code> in symbol names; exceptions
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are noted in <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>.
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No symbol may begin with a digit. Case is significant.
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There is no length limit; all characters are significant. Multibyte characters
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are supported. Symbols are delimited by characters not in that set, or by the
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beginning of a file (since the source program must end with a newline, the end
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of a file is not a possible symbol delimiter). See <a href="Symbols.html#Symbols">Symbols</a>.
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</p>
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<p>Symbol names may also be enclosed in double quote <code>"</code> characters. In such
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cases any characters are allowed, except for the NUL character. If a double
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quote character is to be included in the symbol name it must be preceeded by a
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backslash <code>\</code> character.
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<a name="index-length-of-symbols"></a>
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</p>
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</body>
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</html>
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