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| <h3 class="section">8.204 <code>REAL</code> — Convert to real type</h3> |
| |
| <p><a name="index-REAL-972"></a><a name="index-REALPART-973"></a><a name="index-FLOAT-974"></a><a name="index-DFLOAT-975"></a><a name="index-SNGL-976"></a><a name="index-conversion_002c-to-real-977"></a><a name="index-complex-numbers_002c-real-part-978"></a> |
| <dl> |
| <dt><em>Description</em>:<dd><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 <samp><span class="command">g77</span></samp>, |
| and its use is strongly discouraged. |
| |
| <br><dt><em>Standard</em>:<dd>Fortran 77 and later |
| |
| <br><dt><em>Class</em>:<dd>Elemental function |
| |
| <br><dt><em>Syntax</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="80%"><code>RESULT = REAL(A [, KIND])</code> |
| <br></td></tr><tr align="left"><td valign="top" width="80%"><code>RESULT = REALPART(Z)</code> |
| <br></td></tr></table> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>A</var> </td><td valign="top" width="70%">Shall be <code>INTEGER</code>, <code>REAL</code>, or |
| <code>COMPLEX</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>KIND</var> </td><td valign="top" width="70%">(Optional) An <code>INTEGER</code> initialization |
| expression indicating the kind parameter of the result. |
| <br></td></tr></table> |
| |
| <br><dt><em>Return value</em>:<dd>These functions return a <code>REAL</code> variable or array under |
| the following rules: |
| |
| <dl> |
| <dt>(A)<dd><code>REAL(A)</code> is converted to a default real type if <var>A</var> is an |
| integer or real variable. |
| <br><dt>(B)<dd><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. |
| <br><dt>(C)<dd><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. |
| </dl> |
| |
| <br><dt><em>Example</em>:<dd> |
| <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> |
| <br><dt><em>Specific names</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="20%">Name </td><td valign="top" width="20%">Argument </td><td valign="top" width="20%">Return type </td><td valign="top" width="25%">Standard |
| <br></td></tr><tr align="left"><td valign="top" width="20%"><code>FLOAT(A)</code> </td><td valign="top" width="20%"><code>INTEGER(4)</code> </td><td valign="top" width="20%"><code>REAL(4)</code> </td><td valign="top" width="25%">Fortran 77 and later |
| <br></td></tr><tr align="left"><td valign="top" width="20%"><code>DFLOAT(A)</code> </td><td valign="top" width="20%"><code>INTEGER(4)</code> </td><td valign="top" width="20%"><code>REAL(8)</code> </td><td valign="top" width="25%">GNU extension |
| <br></td></tr><tr align="left"><td valign="top" width="20%"><code>SNGL(A)</code> </td><td valign="top" width="20%"><code>INTEGER(8)</code> </td><td valign="top" width="20%"><code>REAL(4)</code> </td><td valign="top" width="25%">Fortran 77 and later |
| <br></td></tr></table> |
| |
| <br><dt><em>See also</em>:<dd><a href="DBLE.html#DBLE">DBLE</a> |
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