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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>frexp</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= "frexp.html">frexp</a> </div> <div class="name-format"> frexp </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <math.h> double frexp( double num, int* exp );</pre> <p>The function frexp() is used to decompose <em>num</em> into two parts: a mantissa between 0.5 and 1 (returned by the function) and an exponent returned as <em>exp</em>. Scientific notation works like this:</p> <pre class="example-code"> num = mantissa * (2 ^ exp) </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="ldexp.html">ldexp</a><br> <a href="modf.html">modf</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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