132 lines
5.2 KiB
HTML
132 lines
5.2 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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<!-- Copyright (C) 1999-2016 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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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>The GNU Fortran Compiler: ENCODE and DECODE statements</title>
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<meta name="description" content="The GNU Fortran Compiler: ENCODE and DECODE statements">
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<meta name="keywords" content="The GNU Fortran Compiler: ENCODE and DECODE statements">
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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="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Extensions-not-implemented-in-GNU-Fortran.html#Extensions-not-implemented-in-GNU-Fortran" rel="up" title="Extensions not implemented in GNU Fortran">
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<link href="Variable-FORMAT-expressions.html#Variable-FORMAT-expressions" rel="next" title="Variable FORMAT expressions">
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<link href="Extensions-not-implemented-in-GNU-Fortran.html#Extensions-not-implemented-in-GNU-Fortran" rel="prev" title="Extensions not implemented in GNU Fortran">
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<style type="text/css">
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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="ENCODE-and-DECODE-statements"></a>
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<div class="header">
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<p>
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Next: <a href="Variable-FORMAT-expressions.html#Variable-FORMAT-expressions" accesskey="n" rel="next">Variable FORMAT expressions</a>, Up: <a href="Extensions-not-implemented-in-GNU-Fortran.html#Extensions-not-implemented-in-GNU-Fortran" accesskey="u" rel="up">Extensions not 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>
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</div>
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<hr>
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<a name="ENCODE-and-DECODE-statements-1"></a>
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<h4 class="subsection">6.2.1 <code>ENCODE</code> and <code>DECODE</code> statements</h4>
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<a name="index-ENCODE"></a>
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<a name="index-DECODE"></a>
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<p>GNU Fortran does not support the <code>ENCODE</code> and <code>DECODE</code>
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statements. These statements are best replaced by <code>READ</code> and
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<code>WRITE</code> statements involving internal files (<code>CHARACTER</code>
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variables and arrays), which have been part of the Fortran standard since
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Fortran 77. For example, replace a code fragment like
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</p>
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<div class="smallexample">
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<pre class="smallexample"> INTEGER*1 LINE(80)
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REAL A, B, C
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c ... Code that sets LINE
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DECODE (80, 9000, LINE) A, B, C
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9000 FORMAT (1X, 3(F10.5))
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</pre></div>
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<p>with the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> CHARACTER(LEN=80) LINE
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REAL A, B, C
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c ... Code that sets LINE
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READ (UNIT=LINE, FMT=9000) A, B, C
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9000 FORMAT (1X, 3(F10.5))
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</pre></div>
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<p>Similarly, replace a code fragment like
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</p>
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<div class="smallexample">
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<pre class="smallexample"> INTEGER*1 LINE(80)
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REAL A, B, C
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c ... Code that sets A, B and C
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ENCODE (80, 9000, LINE) A, B, C
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9000 FORMAT (1X, 'OUTPUT IS ', 3(F10.5))
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</pre></div>
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<p>with the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> CHARACTER(LEN=80) LINE
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REAL A, B, C
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c ... Code that sets A, B and C
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WRITE (UNIT=LINE, FMT=9000) A, B, C
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9000 FORMAT (1X, 'OUTPUT IS ', 3(F10.5))
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</pre></div>
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</body>
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</html>
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