📄 begin.html
字号:
<!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>begin</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++ Vectors</a> > <a href="begin.html">begin</a> </div> <div class="name-format"> begin </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <vector> iterator begin(); const_iterator begin() const;</pre> <p>The function begin() returns an iterator to the first element of the vector, and runs in <a href= "../complexity.html">constant time</a>.</p> <p>For example, the following code uses begin() to initialize an iterator that is used to traverse the elements of a vector:</p> <pre class="example-code"> vector<string> words; string str; while( cin >> str ) words.push_back(str); vector<string>::iterator iter; for( iter = words.begin(); iter != words.end(); iter++ ) { cout << *iter << endl; }</pre> <p>When given this input:</p> <pre class="example-code"> hey mickey you're so fine</pre> <p>...the above code produces the following output:</p> <pre class="example-code"> hey mickey you're so fine</pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="vector_operators.html">[] operator</a><br> <a href="at.html">at</a><br> <a href="end.html">end</a><br> <a href="rbegin.html">rbegin</a><br> <a href="rend.html">rend</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -