150 lines
5.9 KiB
HTML
150 lines
5.9 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: ABS</title>
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<meta name="description" content="The GNU Fortran Compiler: ABS">
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<meta name="keywords" content="The GNU Fortran Compiler: ABS">
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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="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<link href="ACCESS.html#ACCESS" rel="next" title="ACCESS">
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<link href="ABORT.html#ABORT" rel="prev" title="ABORT">
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<style type="text/css">
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a.summary-letter {text-decoration: 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="ABS"></a>
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<div class="header">
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<p>
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Next: <a href="ACCESS.html#ACCESS" accesskey="n" rel="next">ACCESS</a>, Previous: <a href="ABORT.html#ABORT" accesskey="p" rel="prev">ABORT</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</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="ABS-_002d_002d_002d-Absolute-value"></a>
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<h3 class="section">9.3 <code>ABS</code> — Absolute value</h3>
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<a name="index-ABS"></a>
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<a name="index-CABS"></a>
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<a name="index-DABS"></a>
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<a name="index-IABS"></a>
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<a name="index-ZABS"></a>
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<a name="index-CDABS"></a>
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<a name="index-absolute-value"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>ABS(A)</code> computes the absolute value of <code>A</code>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 77 and later, has overloads that are GNU extensions
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Elemental function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = ABS(A)</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>A</var></td><td width="70%">The type of the argument shall be an <code>INTEGER</code>,
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<code>REAL</code>, or <code>COMPLEX</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value is of the same type and
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kind as the argument except the return value is <code>REAL</code> for a
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<code>COMPLEX</code> argument.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test_abs
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integer :: i = -1
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real :: x = -1.e0
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complex :: z = (-1.e0,0.e0)
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i = abs(i)
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x = abs(x)
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x = abs(z)
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end program test_abs
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</pre></div>
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</dd>
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<dt><em>Specific names</em>:</dt>
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<dd><table>
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<tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr>
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<tr><td width="20%"><code>ABS(A)</code></td><td width="20%"><code>REAL(4) A</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr>
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<tr><td width="20%"><code>CABS(A)</code></td><td width="20%"><code>COMPLEX(4) A</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr>
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<tr><td width="20%"><code>DABS(A)</code></td><td width="20%"><code>REAL(8) A</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">Fortran 77 and later</td></tr>
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<tr><td width="20%"><code>IABS(A)</code></td><td width="20%"><code>INTEGER(4) A</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="25%">Fortran 77 and later</td></tr>
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<tr><td width="20%"><code>ZABS(A)</code></td><td width="20%"><code>COMPLEX(8) A</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr>
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<tr><td width="20%"><code>CDABS(A)</code></td><td width="20%"><code>COMPLEX(8) A</code></td><td width="20%"><code>COMPLEX(8)</code></td><td width="25%">GNU extension</td></tr>
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</table>
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</dd>
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</dl>
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</body>
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</html>
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