📄 atoi.html
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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>atoi</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= "atoi.html">atoi</a> </div> <div class="name-format"> atoi </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <stdlib.h> int atoi( const char *str );</pre> <p>The atoi() function converts <em>str</em> into an integer, and returns that integer. <em>str</em> should start with whitespace or some sort of number, and atoi() will stop reading from <em>str</em> as soon as a non-numerical character has been read. For example:</p> <pre class="example-code"> int i; i = atoi( "512" ); i = atoi( "512.035" ); i = atoi( " 512.035" ); i = atoi( " 512+34" ); i = atoi( " 512 bottles of beer on the wall" );</pre> <p>All five of the above assignments to the variable <em>i</em> would result in it being set to 512.</p> <p>If the conversion cannot be performed, then atoi() will return zero:</p> <pre class="example-code"> int i = atoi( " does not work: 512" ); // results in i == 0</pre> <p>You can use <a href= "../stdio/sprintf.html">sprintf</a>() to convert a number into a string.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="atof.html">atof</a><br> <a href="atol.html">atol</a><br> (Standard C I/O) <a href="../stdio/sprintf.html">sprintf</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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