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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>str</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++ String Streams</a> > <a href="str.html">str</a> </div> <div class="name-format"> str </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <sstream> void str( string s ); string str();</pre> <p>The function <em>str()</em> can be used in two ways. First, it can be used to get a copy of the string that is being manipulated by the current stream string. This is most useful with output strings. For example:</p> <pre class="example-code"> ostringstream stream1; stream1 << "Testing!" << endl; cout << stream1.str();</pre> <p>Second, <em>str()</em> can be used to copy a string into the stream. This is most useful with input strings. For example:</p> <pre class="example-code"> istringstream stream1; string string1 = "25"; stream1.str(string1);</pre> <p><em>str()</em>, along with <em>clear()</em>, is also handy when you need to clear the stream so that it can be reused:</p> <pre class="example-code"> istringstream stream1; float num; // use it once string string1 = "25 1 3.235\n1111111\n222222"; stream1.str(string1); while( stream1 >> num ) cout << "num: " << num << endl; // displays numbers, one per line // use the same string stream again with clear() and str() string string2 = "1 2 3 4 5 6 7 8 9 10"; stream1.clear(); stream1.str(string2); while( stream1 >> num ) cout << "num: " << num << endl; // displays numbers, one per line</pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="rdbuf.html">rdbuf()</a><br> <a href="../cppio/index.html">C++ I/O Streams</a><br> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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