173 lines
6.6 KiB
HTML
173 lines
6.6 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: ICHAR</title>
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<meta name="description" content="The GNU Fortran Compiler: ICHAR">
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<meta name="keywords" content="The GNU Fortran Compiler: ICHAR">
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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="IDATE.html#IDATE" rel="next" title="IDATE">
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<link href="IBSET.html#IBSET" rel="prev" title="IBSET">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="ICHAR"></a>
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<div class="header">
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<p>
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Next: <a href="IDATE.html#IDATE" accesskey="n" rel="next">IDATE</a>, Previous: <a href="IBSET.html#IBSET" accesskey="p" rel="prev">IBSET</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="ICHAR-_002d_002d_002d-Character_002dto_002dinteger-conversion-function"></a>
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<h3 class="section">9.135 <code>ICHAR</code> — Character-to-integer conversion function</h3>
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<a name="index-ICHAR"></a>
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<a name="index-conversion_002c-to-integer-2"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>ICHAR(C)</code> returns the code for the character in the first character
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position of <code>C</code> in the system’s native character set.
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The correspondence between characters and their codes is not necessarily
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the same across different GNU Fortran implementations.
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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, with <var>KIND</var> argument Fortran 2003 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>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 = ICHAR(C [, KIND])</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>C</var></td><td width="70%">Shall be a scalar <code>CHARACTER</code>, with <code>INTENT(IN)</code></td></tr>
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<tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization
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expression indicating the kind parameter of the result.</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 type <code>INTEGER</code> and of kind <var>KIND</var>. If
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<var>KIND</var> is absent, the return value is of default integer kind.
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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_ichar
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integer i
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i = ichar(' ')
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end program test_ichar
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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>ICHAR(C)</code></td><td width="20%"><code>CHARACTER C</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="25%">Fortran 77 and later</td></tr>
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</table>
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</dd>
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<dt><em>Note</em>:</dt>
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<dd><p>No intrinsic exists to convert between a numeric value and a formatted
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character string representation – for instance, given the
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<code>CHARACTER</code> value <code>'154'</code>, obtaining an <code>INTEGER</code> or
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<code>REAL</code> value with the value 154, or vice versa. Instead, this
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functionality is provided by internal-file I/O, as in the following
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example:
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</p><div class="smallexample">
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<pre class="smallexample">program read_val
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integer value
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character(len=10) string, string2
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string = '154'
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! Convert a string to a numeric value
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read (string,'(I10)') value
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print *, value
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! Convert a value to a formatted string
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write (string2,'(I10)') value
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print *, string2
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end program read_val
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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="ACHAR.html#ACHAR">ACHAR</a>, <a href="CHAR.html#CHAR">CHAR</a>, <a href="IACHAR.html#IACHAR">IACHAR</a>
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="IDATE.html#IDATE" accesskey="n" rel="next">IDATE</a>, Previous: <a href="IBSET.html#IBSET" accesskey="p" rel="prev">IBSET</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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</body>
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</html>
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