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| <title>The GNU Fortran Compiler: REAL</title> |
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| <a name="REAL-_002d_002d_002d-Convert-to-real-type"></a> |
| <h3 class="section">8.204 <code>REAL</code> — Convert to real type</h3> |
| <a name="index-REAL"></a> |
| <a name="index-REALPART"></a> |
| <a name="index-FLOAT"></a> |
| <a name="index-DFLOAT"></a> |
| <a name="index-SNGL"></a> |
| <a name="index-conversion_002c-to-real-1"></a> |
| <a name="index-complex-numbers_002c-real-part-1"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>REAL(A [, KIND])</code> converts its argument <var>A</var> to a real type. The |
| <code>REALPART</code> function is provided for compatibility with <code>g77</code>, |
| and its use is strongly discouraged. |
| </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><table> |
| <tr><td width="80%"><code>RESULT = REAL(A [, KIND])</code></td></tr> |
| <tr><td width="80%"><code>RESULT = REALPART(Z)</code></td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>A</var></td><td width="70%">Shall be <code>INTEGER</code>, <code>REAL</code>, or |
| <code>COMPLEX</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>These functions return a <code>REAL</code> variable or array under |
| the following rules: |
| </p> |
| <dl compact="compact"> |
| <dt>(A)</dt> |
| <dd><p><code>REAL(A)</code> is converted to a default real type if <var>A</var> is an |
| integer or real variable. |
| </p></dd> |
| <dt>(B)</dt> |
| <dd><p><code>REAL(A)</code> is converted to a real type with the kind type parameter |
| of <var>A</var> if <var>A</var> is a complex variable. |
| </p></dd> |
| <dt>(C)</dt> |
| <dd><p><code>REAL(A, KIND)</code> is converted to a real type with kind type |
| parameter <var>KIND</var> if <var>A</var> is a complex, integer, or real |
| variable. |
| </p></dd> |
| </dl> |
| |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_real |
| complex :: x = (1.0, 2.0) |
| print *, real(x), real(x,8), realpart(x) |
| end program test_real |
| </pre></div> |
| |
| </dd> |
| <dt><em>Specific names</em>:</dt> |
| <dd><table> |
| <tr><td width="20%">Name</td><td width="20%">Argument</td><td width="20%">Return type</td><td width="25%">Standard</td></tr> |
| <tr><td width="20%"><code>FLOAT(A)</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| <tr><td width="20%"><code>DFLOAT(A)</code></td><td width="20%"><code>INTEGER(4)</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">GNU extension</td></tr> |
| <tr><td width="20%"><code>SNGL(A)</code></td><td width="20%"><code>INTEGER(8)</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 77 and later</td></tr> |
| </table> |
| |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="DBLE.html#DBLE">DBLE</a> |
| </p> |
| </dd> |
| </dl> |
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