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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>Bitset Constructors</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++ Bitsets</a> > <a href= "bitset_constructors.html">Bitset Constructors</a> </div> <div class="name-format"> Bitset Constructors </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <bitset> bitset(); bitset( unsigned long val );</pre> <p>Bitsets can either be constructed with no arguments or with an unsigned long number val that will be converted into binary and inserted into the bitset. When creating bitsets, the number given in the place of the template determines how long the bitset is.</p> <p>For example, the following code creates two bitsets and displays them:</p> <pre class="example-code"> // create a bitset that is 8 bits long bitset<8> bs; // display that bitset for( int i = (int) bs.size()-1; i >= 0; i-- ) { cout << bs[i] << " "; } cout << endl; // create a bitset out of a number bitset<8> bs2( (long) 131 ); // display that bitset, too for( int i = (int) bs2.size()-1; i >= 0; i-- ) { cout << bs2[i] << " "; } cout << endl; </pre> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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