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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>atof</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 String and Character</a> > <a href= "atof.html">atof</a> </div> <div class="name-format"> atof </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <stdlib.h> double atof( const char *str );</pre> <p>The function atof() converts <em>str</em> into a double, then returns that value. <em>str</em> must start with a valid number, but can be terminated with any non-numerical character, other than "E" or "e". For example,</p> <pre class="example-code"> x = atof( "42.0is_the_answer" ); </pre> <p>results in x being set to 42.0.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="atoi.html">atoi</a><br> <a href="atol.html">atol</a><br> (Standard C I/O) <a href="../stdio/sprintf.html">sprintf</a><br> <a href="strtod.html">strtod</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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