preprocessor_vars.html
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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>Predefined preprocessor variables</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/C++ Pre-processor Commands</a> > <a href= "preprocessor_vars.html">Predefined preprocessor variables</a> </div> <div class="name-format"> Predefined preprocessor variables </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> __LINE__ __FILE__ __DATE__ __TIME__ __cplusplus __STDC__</pre> <p>The following variables can vary by compiler, but generally work:</p> <ul> <li>The __LINE__ and __FILE__ variables represent the current line and current file being processed.</li> <li>The __DATE__ variable contains the current date, in the form month/day/year. This is the date that the file was compiled, not necessarily the current date.</li> <li>The __TIME__ variable represents the current time, in the form hour:minute:second. This is the time that the file was compiled, not necessarily the current time.</li> <li>The __cplusplus variable is only defined when compiling a C++ program. In some older compilers, this is also called c_plusplus.</li> <li>The __STDC__ variable is defined when compiling a C program, and may also be defined when compiling C++.</li> </ul> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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