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| <title>The GNU Fortran Compiler: LOG10</title> |
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| <a name="LOG10-_002d_002d_002d-Base-10-logarithm-function"></a> |
| <h3 class="section">9.168 <code>LOG10</code> — Base 10 logarithm function</h3> |
| <a name="index-LOG10"></a> |
| <a name="index-ALOG10"></a> |
| <a name="index-DLOG10"></a> |
| <a name="index-exponential-function_002c-inverse-1"></a> |
| <a name="index-logarithm-function-with-base-10"></a> |
| <a name="index-base-10-logarithm-function"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>LOG10(X)</code> computes the base 10 logarithm of <var>X</var>. |
| </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 = LOG10(X)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>X</var></td><td width="70%">The type shall be <code>REAL</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The return value is of type <code>REAL</code> or <code>COMPLEX</code>. |
| The kind type parameter is the same as <var>X</var>. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_log10 |
| real(8) :: x = 10.0_8 |
| x = log10(x) |
| end program test_log10 |
| </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>ALOG10(X)</code></td><td width="20%"><code>REAL(4) X</code></td><td width="20%"><code>REAL(4)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| <tr><td width="20%"><code>DLOG10(X)</code></td><td width="20%"><code>REAL(8) X</code></td><td width="20%"><code>REAL(8)</code></td><td width="25%">Fortran 95 and later</td></tr> |
| </table> |
| </dd> |
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