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<title>The GNU Fortran Compiler: SELECTED_REAL_KIND</title>
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<p>
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Next: <a href="SET_005fEXPONENT.html#SET_005fEXPONENT" accesskey="n" rel="next">SET_EXPONENT</a>, Previous: <a href="SELECTED_005fINT_005fKIND.html#SELECTED_005fINT_005fKIND" accesskey="p" rel="prev">SELECTED_INT_KIND</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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<a name="SELECTED_005fREAL_005fKIND-_002d_002d_002d-Choose-real-kind"></a>
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<h3 class="section">9.232 <code>SELECTED_REAL_KIND</code> — Choose real kind</h3>
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<a name="index-SELECTED_005fREAL_005fKIND"></a>
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<a name="index-real-kind"></a>
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<a name="index-kind_002c-real"></a>
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<a name="index-radix_002c-real"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>SELECTED_REAL_KIND(P,R)</code> returns the kind value of a real data type
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with decimal precision of at least <code>P</code> digits, exponent range of
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at least <code>R</code>, and with a radix of <code>RADIX</code>.
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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 <code>RADIX</code> Fortran 2008 or 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>Transformational 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 = SELECTED_REAL_KIND([P, R, RADIX])</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>P</var></td><td width="70%">(Optional) shall be a scalar and of type <code>INTEGER</code>.</td></tr>
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<tr><td width="15%"><var>R</var></td><td width="70%">(Optional) shall be a scalar and of type <code>INTEGER</code>.</td></tr>
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<tr><td width="15%"><var>RADIX</var></td><td width="70%">(Optional) shall be a scalar and of type <code>INTEGER</code>.</td></tr>
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</table>
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<p>Before Fortran 2008, at least one of the arguments <var>R</var> or <var>P</var> shall
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be present; since Fortran 2008, they are assumed to be zero if absent.
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</p>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd>
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<p><code>SELECTED_REAL_KIND</code> returns the value of the kind type parameter of
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a real data type with decimal precision of at least <code>P</code> digits, a
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decimal exponent range of at least <code>R</code>, and with the requested
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<code>RADIX</code>. If the <code>RADIX</code> parameter is absent, real kinds with
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any radix can be returned. If more than one real data type meet the
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criteria, the kind of the data type with the smallest decimal precision
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is returned. If no real data type matches the criteria, the result is
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</p><dl compact="compact">
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<dt>-1 if the processor does not support a real data type with a</dt>
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<dd><p>precision greater than or equal to <code>P</code>, but the <code>R</code> and
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<code>RADIX</code> requirements can be fulfilled
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</p></dd>
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<dt>-2 if the processor does not support a real type with an exponent</dt>
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<dd><p>range greater than or equal to <code>R</code>, but <code>P</code> and <code>RADIX</code>
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are fulfillable
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</p></dd>
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<dt>-3 if <code>RADIX</code> but not <code>P</code> and <code>R</code> requirements</dt>
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<dd><p>are fulfillable
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</p></dd>
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<dt>-4 if <code>RADIX</code> and either <code>P</code> or <code>R</code> requirements</dt>
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<dd><p>are fulfillable
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</p></dd>
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<dt>-5 if there is no real type with the given <code>RADIX</code></dt>
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</dl>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="PRECISION.html#PRECISION">PRECISION</a>, <a href="RANGE.html#RANGE">RANGE</a>, <a href="RADIX.html#RADIX">RADIX</a>
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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 real_kinds
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integer,parameter :: p6 = selected_real_kind(6)
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integer,parameter :: p10r100 = selected_real_kind(10,100)
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integer,parameter :: r400 = selected_real_kind(r=400)
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real(kind=p6) :: x
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real(kind=p10r100) :: y
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real(kind=r400) :: z
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print *, precision(x), range(x)
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print *, precision(y), range(y)
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print *, precision(z), range(z)
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end program real_kinds
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</pre></div>
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</dd>
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</dl>
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<p>
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Next: <a href="SET_005fEXPONENT.html#SET_005fEXPONENT" accesskey="n" rel="next">SET_EXPONENT</a>, Previous: <a href="SELECTED_005fINT_005fKIND.html#SELECTED_005fINT_005fKIND" accesskey="p" rel="prev">SELECTED_INT_KIND</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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