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| <h3 class="section">1.34 <code>log10</code>, <code>log10f</code>—base 10 logarithms</h3> |
| |
| <p><a name="index-log10-100"></a><a name="index-log10f-101"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double log10(double <var>x</var>); |
| float log10f(float <var>x</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>log10</code> returns the base 10 logarithm of <var>x</var>. |
| It is implemented as <code>log(</code><var>x</var><code>) / log(10)</code>. |
| |
| <p><code>log10f</code> is identical, save that it takes and returns <code>float</code> values. |
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| <p><br> |
| <strong>Returns</strong><br> |
| <code>log10</code> and <code>log10f</code> return the calculated value. |
| |
| <p>See the description of <code>log</code> for information on errors. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>log10</code> is ANSI C. <code>log10f</code> is an extension. |
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