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| <title>The GNU Fortran Compiler: KIND Type Parameters</title> |
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| <a name="KIND-Type-Parameters"></a> |
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| Next: <a href="Internal-representation-of-LOGICAL-variables.html#Internal-representation-of-LOGICAL-variables" accesskey="n" rel="next">Internal representation of LOGICAL variables</a>, Up: <a href="Compiler-Characteristics.html#Compiler-Characteristics" accesskey="u" rel="up">Compiler Characteristics</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="KIND-Type-Parameters-1"></a> |
| <h3 class="section">5.1 KIND Type Parameters</h3> |
| <a name="index-kind"></a> |
| |
| <p>The <code>KIND</code> type parameters supported by GNU Fortran for the primitive |
| data types are: |
| </p> |
| <dl compact="compact"> |
| <dt><code>INTEGER</code></dt> |
| <dd><p>1, 2, 4, 8*, 16*, default: 4** |
| </p> |
| </dd> |
| <dt><code>LOGICAL</code></dt> |
| <dd><p>1, 2, 4, 8*, 16*, default: 4** |
| </p> |
| </dd> |
| <dt><code>REAL</code></dt> |
| <dd><p>4, 8, 10*, 16*, default: 4*** |
| </p> |
| </dd> |
| <dt><code>COMPLEX</code></dt> |
| <dd><p>4, 8, 10*, 16*, default: 4*** |
| </p> |
| </dd> |
| <dt><code>DOUBLE PRECISION</code></dt> |
| <dd><p>4, 8, 10*, 16*, default: 8*** |
| </p> |
| </dd> |
| <dt><code>CHARACTER</code></dt> |
| <dd><p>1, 4, default: 1 |
| </p> |
| </dd> |
| </dl> |
| |
| <p>* not available on all systems <br> |
| ** unless <samp>-fdefault-integer-8</samp> is used <br> |
| *** unless <samp>-fdefault-real-8</samp> is used (see <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a>) |
| </p> |
| <p>The <code>KIND</code> value matches the storage size in bytes, except for |
| <code>COMPLEX</code> where the storage size is twice as much (or both real and |
| imaginary part are a real value of the given size). It is recommended to use |
| the <a href="SELECTED_005fCHAR_005fKIND.html#SELECTED_005fCHAR_005fKIND">SELECTED_CHAR_KIND</a>, <a href="SELECTED_005fINT_005fKIND.html#SELECTED_005fINT_005fKIND">SELECTED_INT_KIND</a> and |
| <a href="SELECTED_005fREAL_005fKIND.html#SELECTED_005fREAL_005fKIND">SELECTED_REAL_KIND</a> intrinsics or the <code>INT8</code>, <code>INT16</code>, |
| <code>INT32</code>, <code>INT64</code>, <code>REAL32</code>, <code>REAL64</code>, and <code>REAL128</code> |
| parameters of the <code>ISO_FORTRAN_ENV</code> module instead of the concrete values. |
| The available kind parameters can be found in the constant arrays |
| <code>CHARACTER_KINDS</code>, <code>INTEGER_KINDS</code>, <code>LOGICAL_KINDS</code> and |
| <code>REAL_KINDS</code> in the <a href="ISO_005fFORTRAN_005fENV.html#ISO_005fFORTRAN_005fENV">ISO_FORTRAN_ENV</a> module. For C interoperability, |
| the kind parameters of the <a href="ISO_005fC_005fBINDING.html#ISO_005fC_005fBINDING">ISO_C_BINDING</a> module should be used. |
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