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| <title>The GNU Fortran Compiler: Old-style kind specifications</title> |
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| <h4 class="subsection">6.1.1 Old-style kind specifications</h4> |
| <a name="index-kind_002c-old_002dstyle"></a> |
| |
| <p>GNU Fortran allows old-style kind specifications in declarations. These |
| look like: |
| </p><div class="smallexample"> |
| <pre class="smallexample"> TYPESPEC*size x,y,z |
| </pre></div> |
| <p>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 |
| </p><div class="smallexample"> |
| <pre class="smallexample"> TYPESPEC(k) x,y,z |
| </pre></div> |
| <p>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: |
| </p><div class="smallexample"> |
| <pre class="smallexample">INTEGER, PARAMETER :: dbl = KIND(1.0d0) |
| REAL(KIND=dbl) :: x |
| </pre></div> |
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