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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | 6ce4ebed87858ecdd79a1091367c6e961055daa9 (patch) | |
| tree | 1c2a6a60531acf791531bbd9c8ac14c23ef8a66c /share/doc/gdb/C-Constants.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/C-Constants.html b/share/doc/gdb/C-Constants.html new file mode 100644 index 0000000..af1a5d4 --- /dev/null +++ b/share/doc/gdb/C-Constants.html @@ -0,0 +1,141 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 "Free Software" and "Free Software Needs +Free Documentation", with the Front-Cover Texts being "A GNU Manual," +and with the Back-Cover Texts as in (a) below. + +(a) The FSF's Back-Cover Text is: "You are free to copy and modify +this GNU Manual. Buying copies from GNU Press supports the FSF in +developing GNU and promoting software freedom." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: C Constants</title> + +<meta name="description" content="Debugging with GDB: C Constants"> +<meta name="keywords" content="Debugging with GDB: C Constants"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="C.html#C" rel="up" title="C"> +<link href="C-Plus-Plus-Expressions.html#C-Plus-Plus-Expressions" rel="next" title="C Plus Plus Expressions"> +<link href="C-Operators.html#C-Operators" rel="previous" title="C Operators"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="C-Constants"></a> +<div class="header"> +<p> +Next: <a href="C-Plus-Plus-Expressions.html#C-Plus-Plus-Expressions" accesskey="n" rel="next">C Plus Plus Expressions</a>, Previous: <a href="C-Operators.html#C-Operators" accesskey="p" rel="previous">C Operators</a>, Up: <a href="C.html#C" accesskey="u" rel="up">C</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="C-and-C_002b_002b-Constants"></a> +<h4 class="subsubsection">15.4.1.2 C and C<tt>++</tt> Constants</h4> + +<a name="index-C-and-C_002b_002b-constants"></a> + +<p><small>GDB</small> allows you to express the constants of C and C<tt>++</tt> in the +following ways: +</p> +<ul> +<li> Integer constants are a sequence of digits. Octal constants are +specified by a leading ‘<samp>0</samp>’ (i.e. zero), and hexadecimal constants +by a leading ‘<samp>0x</samp>’ or ‘<samp>0X</samp>’. Constants may also end with a letter +‘<samp>l</samp>’, specifying that the constant should be treated as a +<code>long</code> value. + +</li><li> Floating point constants are a sequence of digits, followed by a decimal +point, followed by a sequence of digits, and optionally followed by an +exponent. An exponent is of the form: +‘<samp>e<span class="roman">[[</span>+<span class="roman">]|</span><span class="nolinebreak">-</span><span class="roman">]</span><var>nnn</var><!-- /@w --></samp>’, where <var>nnn</var> is another +sequence of digits. The ‘<samp>+</samp>’ is optional for positive exponents. +A floating-point constant may also end with a letter ‘<samp>f</samp>’ or +‘<samp>F</samp>’, specifying that the constant should be treated as being of +the <code>float</code> (as opposed to the default <code>double</code>) type; or with +a letter ‘<samp>l</samp>’ or ‘<samp>L</samp>’, which specifies a <code>long double</code> +constant. + +</li><li> Enumerated constants consist of enumerated identifiers, or their +integral equivalents. + +</li><li> Character constants are a single character surrounded by single quotes +(<code>'</code>), or a number—the ordinal value of the corresponding character +(usually its <small>ASCII</small> value). Within quotes, the single character may +be represented by a letter or by <em>escape sequences</em>, which are of +the form ‘<samp>\<var>nnn</var></samp>’, where <var>nnn</var> is the octal representation +of the character’s ordinal value; or of the form ‘<samp>\<var>x</var></samp>’, where +‘<samp><var>x</var></samp>’ is a predefined special character—for example, +‘<samp>\n</samp>’ for newline. + +<p>Wide character constants can be written by prefixing a character +constant with ‘<samp>L</samp>’, as in C. For example, ‘<samp>L'x'</samp>’ is the wide +form of ‘<samp>x</samp>’. The target wide character set is used when +computing the value of this constant (see <a href="Character-Sets.html#Character-Sets">Character Sets</a>). +</p> +</li><li> String constants are a sequence of character constants surrounded by +double quotes (<code>"</code>). Any valid character constant (as described +above) may appear. Double quotes within the string must be preceded by +a backslash, so for instance ‘<samp>"a\"b'c"</samp>’ is a string of five +characters. + +<p>Wide string constants can be written by prefixing a string constant +with ‘<samp>L</samp>’, as in C. The target wide character set is used when +computing the value of this constant (see <a href="Character-Sets.html#Character-Sets">Character Sets</a>). +</p> +</li><li> Pointer constants are an integral value. You can also write pointers +to constants using the C operator ‘<samp>&</samp>’. + +</li><li> Array constants are comma-separated lists surrounded by braces ‘<samp>{</samp>’ +and ‘<samp>}</samp>’; for example, ‘<samp>{1,2,3}</samp>’ is a three-element array of +integers, ‘<samp>{{1,2}, {3,4}, {5,6}}</samp>’ is a three-by-two array, +and ‘<samp>{&"hi", &"there", &"fred"}</samp>’ is a three-element array of pointers. +</li></ul> + +<hr> +<div class="header"> +<p> +Next: <a href="C-Plus-Plus-Expressions.html#C-Plus-Plus-Expressions" accesskey="n" rel="next">C Plus Plus Expressions</a>, Previous: <a href="C-Operators.html#C-Operators" accesskey="p" rel="previous">C Operators</a>, Up: <a href="C.html#C" accesskey="u" rel="up">C</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |