129 lines
4.4 KiB
HTML
129 lines
4.4 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: EPSILON</title>
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<meta name="description" content="The GNU Fortran Compiler: EPSILON">
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<meta name="keywords" content="The GNU Fortran Compiler: EPSILON">
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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="ERF.html#ERF" rel="next" title="ERF">
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<link href="EOSHIFT.html#EOSHIFT" rel="prev" title="EOSHIFT">
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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="EPSILON"></a>
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<div class="header">
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<p>
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Next: <a href="ERF.html#ERF" accesskey="n" rel="next">ERF</a>, Previous: <a href="EOSHIFT.html#EOSHIFT" accesskey="p" rel="prev">EOSHIFT</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="EPSILON-_002d_002d_002d-Epsilon-function"></a>
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<h3 class="section">9.87 <code>EPSILON</code> — Epsilon function</h3>
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<a name="index-EPSILON"></a>
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<a name="index-model-representation_002c-epsilon"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>EPSILON(X)</code> returns the smallest number <var>E</var> of the same kind
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as <var>X</var> such that <em>1 + E > 1</em>.
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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 95 and later
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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>Inquiry 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 = EPSILON(X)</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>X</var></td><td width="70%">The type shall be <code>REAL</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 same type as the 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_epsilon
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real :: x = 3.143
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real(8) :: y = 2.33
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print *, EPSILON(x)
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print *, EPSILON(y)
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end program test_epsilon
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</pre></div>
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</dd>
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</dl>
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</body>
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</html>
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