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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>precision</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++ I/O</a> > <a href= "precision.html">precision</a> </div> <div class="name-format"> precision </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <fstream> streamsize precision(); streamsize precision( streamsize p );</pre> <p>The precision() function either sets or returns the current number of digits that is displayed for floating-point variables.</p> <p>For example, the following code sets the precision of the cout stream to 5:</p> <pre class="example-code"> float num = 314.15926535; cout.precision( 5 ); cout << num; </pre> <p>This code displays the following output:</p> <pre class="example-code"> 314.16 </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="fill.html">fill</a><br> <a href="width.html">width</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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