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<a name="log10_002c-log10f_002d_002d_002dbase-10-logarithms"></a>
<h3 class="section">1.35 <code>log10</code>, <code>log10f</code>&mdash;base 10 logarithms</h3>
<a name="index-log10"></a>
<a name="index-log10f"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double log10(double <var>x</var>);
float log10f(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>log10</code> returns the base 10 logarithm of <var>x</var>.
It is implemented as <code>log(<var>x</var>) / log(10)</code>.
</p>
<p><code>log10f</code> is identical, save that it takes and returns <code>float</code> values.
</p>
<br>
<p><strong>Returns</strong><br>
<code>log10</code> and <code>log10f</code> return the calculated value. 
</p>
<p>See the description of <code>log</code> for information on errors.
</p>
<br>
<p><strong>Portability</strong><br>
<code>log10</code> is ANSI C.  <code>log10f</code> is an extension.
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