<html lang="en"> <head> <title>Old-style kind specifications - The GNU Fortran Compiler</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="The GNU Fortran Compiler"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" title="Extensions implemented in GNU Fortran"> <link rel="next" href="Old_002dstyle-variable-initialization.html#Old_002dstyle-variable-initialization" title="Old-style variable initialization"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being ``Funding Free Software'', the Front-Cover Texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled ``GNU Free Documentation License''. (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Old-style-kind-specifications"></a> <a name="Old_002dstyle-kind-specifications"></a> <p> Next: <a rel="next" accesskey="n" href="Old_002dstyle-variable-initialization.html#Old_002dstyle-variable-initialization">Old-style variable initialization</a>, Up: <a rel="up" accesskey="u" href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran">Extensions implemented in GNU Fortran</a> <hr> </div> <h4 class="subsection">6.1.1 Old-style kind specifications</h4> <p><a name="index-kind_002c-old_002dstyle-307"></a> GNU Fortran allows old-style kind specifications in declarations. These look like: <pre class="smallexample"> TYPESPEC*size x,y,z </pre> <p class="noindent">where <code>TYPESPEC</code> is a basic type (<code>INTEGER</code>, <code>REAL</code>, etc.), and where <code>size</code> is a byte count corresponding to the storage size of a valid kind for that type. (For <code>COMPLEX</code> variables, <code>size</code> is the total size of the real and imaginary parts.) The statement then declares <code>x</code>, <code>y</code> and <code>z</code> to be of type <code>TYPESPEC</code> with the appropriate kind. This is equivalent to the standard-conforming declaration <pre class="smallexample"> TYPESPEC(k) x,y,z </pre> <p class="noindent">where <code>k</code> is the kind parameter suitable for the intended precision. As kind parameters are implementation-dependent, use the <code>KIND</code>, <code>SELECTED_INT_KIND</code> and <code>SELECTED_REAL_KIND</code> intrinsics to retrieve the correct value, for instance <code>REAL*8 x</code> can be replaced by: <pre class="smallexample"> INTEGER, PARAMETER :: dbl = KIND(1.0d0) REAL(KIND=dbl) :: x </pre> </body></html>