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<title>The GNU Fortran Compiler: Old-style kind specifications</title>
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<a name="Old_002dstyle-kind-specifications"></a>
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Next: <a href="Old_002dstyle-variable-initialization.html#Old_002dstyle-variable-initialization" accesskey="n" rel="next">Old-style variable initialization</a>, Up: <a href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" accesskey="u" rel="up">Extensions implemented in GNU Fortran</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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<a name="Old_002dstyle-kind-specifications-1"></a>
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<h4 class="subsection">6.1.1 Old-style kind specifications</h4>
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<a name="index-kind_002c-old_002dstyle"></a>
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<p>GNU Fortran allows old-style kind specifications in declarations. These
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look like:
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</p><div class="smallexample">
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<pre class="smallexample"> TYPESPEC*size x,y,z
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</pre></div>
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<p>where <code>TYPESPEC</code> is a basic type (<code>INTEGER</code>, <code>REAL</code>,
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etc.), and where <code>size</code> is a byte count corresponding to the
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storage size of a valid kind for that type. (For <code>COMPLEX</code>
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variables, <code>size</code> is the total size of the real and imaginary
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parts.) The statement then declares <code>x</code>, <code>y</code> and <code>z</code> to
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be of type <code>TYPESPEC</code> with the appropriate kind. This is
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equivalent to the standard-conforming declaration
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</p><div class="smallexample">
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<pre class="smallexample"> TYPESPEC(k) x,y,z
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</pre></div>
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<p>where <code>k</code> is the kind parameter suitable for the intended precision. As
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kind parameters are implementation-dependent, use the <code>KIND</code>,
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<code>SELECTED_INT_KIND</code> and <code>SELECTED_REAL_KIND</code> intrinsics to retrieve
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the correct value, for instance <code>REAL*8 x</code> can be replaced by:
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</p><div class="smallexample">
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<pre class="smallexample">INTEGER, PARAMETER :: dbl = KIND(1.0d0)
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REAL(KIND=dbl) :: x
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</pre></div>
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