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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 | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gfortran/BOZ-literal-constants.html | |
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diff --git a/share/doc/gfortran/BOZ-literal-constants.html b/share/doc/gfortran/BOZ-literal-constants.html new file mode 100644 index 0000000..132e4b5 --- /dev/null +++ b/share/doc/gfortran/BOZ-literal-constants.html @@ -0,0 +1,110 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1999-2023 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 "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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>The GNU Fortran Compiler: BOZ literal constants</title> + +<meta name="description" content="The GNU Fortran Compiler: BOZ literal constants"> +<meta name="keywords" content="The GNU Fortran Compiler: BOZ literal 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="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" rel="up" title="Extensions implemented in GNU Fortran"> +<link href="Real-array-indices.html#Real-array-indices" rel="next" title="Real array indices"> +<link href="Q-exponent_002dletter.html#Q-exponent_002dletter" rel="previous" title="Q exponent-letter"> +<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="BOZ-literal-constants"></a> +<div class="header"> +<p> +Next: <a href="Real-array-indices.html#Real-array-indices" accesskey="n" rel="next">Real array indices</a>, Previous: <a href="Q-exponent_002dletter.html#Q-exponent_002dletter" accesskey="p" rel="previous"><code>Q</code> exponent-letter</a>, Up: <a href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" accesskey="u" rel="up">Extensions implemented in GNU Fortran</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> +</div> +<hr> +<a name="BOZ-literal-constants-1"></a> +<h4 class="subsection">5.1.10 BOZ literal constants</h4> +<a name="index-BOZ-literal-constants"></a> + +<p>Besides decimal constants, Fortran also supports binary (<code>b</code>), +octal (<code>o</code>) and hexadecimal (<code>z</code>) integer constants. The +syntax is: ‘<samp>prefix quote digits quote</samp>’, where the prefix is +either <code>b</code>, <code>o</code> or <code>z</code>, quote is either <code>'</code> or +<code>"</code> and the digits are <code>0</code> or <code>1</code> for binary, +between <code>0</code> and <code>7</code> for octal, and between <code>0</code> and +<code>F</code> for hexadecimal. (Example: <code>b'01011101'</code>.) +</p> +<p>Up to Fortran 95, BOZ literal constants were only allowed to initialize +integer variables in DATA statements. Since Fortran 2003 BOZ literal +constants are also allowed as actual arguments to the <code>REAL</code>, +<code>DBLE</code>, <code>INT</code> and <code>CMPLX</code> intrinsic functions. +The BOZ literal constant is simply a string of bits, which is padded +or truncated as needed, during conversion to a numeric type. The +Fortran standard states that the treatment of the sign bit is processor +dependent. Gfortran interprets the sign bit as a user would expect. +</p> +<p>As a deprecated extension, GNU Fortran allows hexadecimal BOZ literal +constants to be specified using the <code>X</code> prefix. That the BOZ literal +constant can also be specified by adding a suffix to the string, for +example, <code>Z'ABC'</code> and <code>'ABC'X</code> are equivalent. Additionally, +as extension, BOZ literals are permitted in some contexts outside of +<code>DATA</code> and the intrinsic functions listed in the Fortran standard. +Use <samp>-fallow-invalid-boz</samp> to enable the extension. +</p> + + + +</body> +</html> |