140 lines
4.9 KiB
HTML
140 lines
4.9 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: FTELL</title>
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<meta name="description" content="The GNU Fortran Compiler: FTELL">
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<meta name="keywords" content="The GNU Fortran Compiler: FTELL">
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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="GAMMA.html#GAMMA" rel="next" title="GAMMA">
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<link href="FSTAT.html#FSTAT" rel="prev" title="FSTAT">
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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="FTELL"></a>
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<div class="header">
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<p>
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Next: <a href="GAMMA.html#GAMMA" accesskey="n" rel="next">GAMMA</a>, Previous: <a href="FSTAT.html#FSTAT" accesskey="p" rel="prev">FSTAT</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="FTELL-_002d_002d_002d-Current-stream-position"></a>
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<h3 class="section">9.110 <code>FTELL</code> — Current stream position</h3>
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<a name="index-FTELL"></a>
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<a name="index-file-operation_002c-position-1"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p>Retrieves the current position within an open file.
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</p>
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<p>This intrinsic is provided in both subroutine and function forms; however,
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only one form can be used in any given program unit.
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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>GNU extension
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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>Subroutine, 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><table>
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<tr><td width="80%"><code>CALL FTELL(UNIT, OFFSET)</code></td></tr>
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<tr><td width="80%"><code>OFFSET = FTELL(UNIT)</code></td></tr>
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</table>
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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>OFFSET</var></td><td width="70%">Shall of type <code>INTEGER</code>.</td></tr>
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<tr><td width="15%"><var>UNIT</var></td><td width="70%">Shall of type <code>INTEGER</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>In either syntax, <var>OFFSET</var> is set to the current offset of unit
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number <var>UNIT</var>, or to <em>-1</em> if the unit is not currently open.
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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_ftell
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INTEGER :: i
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OPEN(10, FILE="temp.dat")
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CALL ftell(10,i)
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WRITE(*,*) i
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END PROGRAM
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</pre></div>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="FSEEK.html#FSEEK">FSEEK</a>
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</p></dd>
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</dl>
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</body>
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</html>
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