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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>log</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">Standard C Math</a> > <a href="log.html">log</a> </div> <div class="name-format"> log </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <math.h> double log( double num );</pre> <p>The function log() returns the natural (base e) logarithm of <em>num</em>. There's a domain error if <em>num</em> is negative, a range error if <em>num</em> is zero.</p> <p>In order to calculate the logarithm of <em>x</em> to an arbitrary base <em>b</em>, you can use:</p> <pre class="example-code"> double answer = log(x) / log(b);</pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="exp.html">exp</a><br> <a href="log10.html">log10</a><br> <a href="pow.html">pow</a><br> <a href="sqrt.html">sqrt</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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