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<title>The GNU Fortran Compiler: DCMPLX</title>
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<a name="DCMPLX-_002d_002d_002d-Double-complex-conversion-function"></a>
<h3 class="section">9.77 <code>DCMPLX</code> &mdash; Double complex conversion function</h3>
<a name="index-DCMPLX"></a>
<a name="index-complex-numbers_002c-conversion-to-2"></a>
<a name="index-conversion_002c-to-complex-2"></a>
<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p><code>DCMPLX(X [,Y])</code> returns a double complex number where <var>X</var> is
converted to the real component. If <var>Y</var> is present it is converted to the
imaginary component. If <var>Y</var> is not present then the imaginary component is
set to 0.0. If <var>X</var> is complex then <var>Y</var> must not be present.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>GNU extension
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Elemental function
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>RESULT = DCMPLX(X [, Y])</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>X</var></td><td width="70%">The type may be <code>INTEGER</code>, <code>REAL</code>,
or <code>COMPLEX</code>.</td></tr>
<tr><td width="15%"><var>Y</var></td><td width="70%">(Optional if <var>X</var> is not <code>COMPLEX</code>.) May be
<code>INTEGER</code> or <code>REAL</code>.</td></tr>
</table>
</dd>
<dt><em>Return value</em>:</dt>
<dd><p>The return value is of type <code>COMPLEX(8)</code>
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">program test_dcmplx
integer :: i = 42
real :: x = 3.14
complex :: z
z = cmplx(i, x)
print *, dcmplx(i)
print *, dcmplx(x)
print *, dcmplx(z)
print *, dcmplx(x,i)
end program test_dcmplx
</pre></div>
</dd>
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