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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>find</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">C++ Strings</a> > <a href="find.html">find</a> </div> <div class="name-format"> find </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <string> <strong>size_type</strong> find( const string& str, <strong>size_type</strong> index ); <strong>size_type</strong> find( const char* str, <strong>size_type</strong> index ); <strong>size_type</strong> find( const char* str, <strong>size_type</strong> index, <strong>size_type</strong> length ); <strong>size_type</strong> find( char ch, <strong>size_type</strong> index );</pre> <p>The function find() either:</p> <ul> <li>returns the first occurrence of <em>str</em> within the current string, starting at <em>index</em>, string::npos if nothing is found,</li> <li>if the <em>length</em> parameter is given, then find() returns the first occurrence of the first <em>length</em> characters of <em>str</em> within the current string, starting at <em>index</em>, string::npos if nothing is found,</li> <li>or returns the index of the first occurrence <em>ch</em> within the current string, starting at <em>index</em>, string::npos if nothing is found.</li> </ul> <p>For example:</p> <pre class="example-code"> string str1( "Alpha Beta Gamma Delta" ); string::size_type loc = str1.find( "Omega", 0 ); if( loc != string::npos ) { cout << "Found Omega at " << loc << endl; } else { cout << "Didn't find Omega" << endl; }</pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="find_first_not_of.html">find_first_not_of</a><br> <a href="find_first_of.html">find_first_of</a><br> <a href="find_last_not_of.html">find_last_not_of</a><br> <a href="find_last_of.html">find_last_of</a><br> <a href="rfind.html">rfind</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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