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| <title>The GNU Fortran Compiler: CMPLX</title> |
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| <a name="CMPLX-_002d_002d_002d-Complex-conversion-function"></a> |
| <h3 class="section">8.49 <code>CMPLX</code> — Complex conversion function</h3> |
| <a name="index-CMPLX"></a> |
| <a name="index-complex-numbers_002c-conversion-to"></a> |
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| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>CMPLX(X [, Y [, KIND]])</code> returns a 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>Fortran 77 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Elemental function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = CMPLX(X [, Y [, KIND]])</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; only allowed if <var>X</var> is not |
| <code>COMPLEX</code>.) May be <code>INTEGER</code> or <code>REAL</code>.</td></tr> |
| <tr><td width="15%"><var>KIND</var></td><td width="70%">(Optional) An <code>INTEGER</code> initialization |
| expression indicating the kind parameter of the result.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of <code>COMPLEX</code> type, with a kind equal to |
| <var>KIND</var> if it is specified. If <var>KIND</var> is not specified, the |
| result is of the default <code>COMPLEX</code> kind, regardless of the kinds of |
| <var>X</var> and <var>Y</var>. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_cmplx |
| integer :: i = 42 |
| real :: x = 3.14 |
| complex :: z |
| z = cmplx(i, x) |
| print *, z, cmplx(x) |
| end program test_cmplx |
| </pre></div> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="COMPLEX.html#COMPLEX">COMPLEX</a> |
| </p></dd> |
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