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| <a name="SELECTED_005fREAL_005fKIND-_002d_002d_002d-Choose-real-kind"></a> |
| <h3 class="section">8.217 <code>SELECTED_REAL_KIND</code> — Choose real kind</h3> |
| <a name="index-SELECTED_005fREAL_005fKIND"></a> |
| <a name="index-real-kind"></a> |
| <a name="index-kind_002c-real"></a> |
| <a name="index-radix_002c-real"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>SELECTED_REAL_KIND(P,R)</code> returns the kind value of a real data type |
| with decimal precision of at least <code>P</code> digits, exponent range of |
| at least <code>R</code>, and with a radix of <code>RADIX</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 95 and later, with <code>RADIX</code> Fortran 2008 or later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Transformational function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = SELECTED_REAL_KIND([P, R, RADIX])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>P</var></td><td width="70%">(Optional) shall be a scalar and of type <code>INTEGER</code>.</td></tr> |
| <tr><td width="15%"><var>R</var></td><td width="70%">(Optional) shall be a scalar and of type <code>INTEGER</code>.</td></tr> |
| <tr><td width="15%"><var>RADIX</var></td><td width="70%">(Optional) shall be a scalar and of type <code>INTEGER</code>.</td></tr> |
| </table> |
| <p>Before Fortran 2008, at least one of the arguments <var>R</var> or <var>P</var> shall |
| be present; since Fortran 2008, they are assumed to be zero if absent. |
| </p> |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd> |
| <p><code>SELECTED_REAL_KIND</code> returns the value of the kind type parameter of |
| a real data type with decimal precision of at least <code>P</code> digits, a |
| decimal exponent range of at least <code>R</code>, and with the requested |
| <code>RADIX</code>. If the <code>RADIX</code> parameter is absent, real kinds with |
| any radix can be returned. If more than one real data type meet the |
| criteria, the kind of the data type with the smallest decimal precision |
| is returned. If no real data type matches the criteria, the result is |
| </p><dl compact="compact"> |
| <dt>-1 if the processor does not support a real data type with a</dt> |
| <dd><p>precision greater than or equal to <code>P</code>, but the <code>R</code> and |
| <code>RADIX</code> requirements can be fulfilled |
| </p></dd> |
| <dt>-2 if the processor does not support a real type with an exponent</dt> |
| <dd><p>range greater than or equal to <code>R</code>, but <code>P</code> and <code>RADIX</code> |
| are fulfillable |
| </p></dd> |
| <dt>-3 if <code>RADIX</code> but not <code>P</code> and <code>R</code> requirements</dt> |
| <dd><p>are fulfillable |
| </p></dd> |
| <dt>-4 if <code>RADIX</code> and either <code>P</code> or <code>R</code> requirements</dt> |
| <dd><p>are fulfillable |
| </p></dd> |
| <dt>-5 if there is no real type with the given <code>RADIX</code></dt> |
| </dl> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="PRECISION.html#PRECISION">PRECISION</a>, <a href="RANGE.html#RANGE">RANGE</a>, <a href="RADIX.html#RADIX">RADIX</a> |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program real_kinds |
| integer,parameter :: p6 = selected_real_kind(6) |
| integer,parameter :: p10r100 = selected_real_kind(10,100) |
| integer,parameter :: r400 = selected_real_kind(r=400) |
| real(kind=p6) :: x |
| real(kind=p10r100) :: y |
| real(kind=r400) :: z |
| |
| print *, precision(x), range(x) |
| print *, precision(y), range(y) |
| print *, precision(z), range(z) |
| end program real_kinds |
| </pre></div> |
| </dd> |
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