perror.html
来自「从www.CppReference.com打包的C++参考手册」· HTML 代码 · 共 75 行
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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>perror</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">Standard C I/O</a> > <a href= "perror.html">perror</a> </div> <div class="name-format"> perror </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <stdio.h> void perror( const char *str );</pre> <p>The perror() function prints <em>str</em> and an implementation-defined error message corresponding to the global variable <em>errno</em>. For example:</p> <pre class="example-code"> char* input_filename = "not_found.txt"; FILE* input = fopen( input_filename, "r" ); if( input == NULL ) { char error_msg[255]; sprintf( error_msg, "Error opening file '%s'", input_filename ); perror( error_msg ); exit( -1 ); }</pre> <p>The the file called <em>not_found.txt</em> is not found, this code will produce the following output:</p> <pre class="example-output"> Error opening file 'not_found.txt': No such file or directory</pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="clearerr.html">clearerr</a><br> <a href="feof.html">feof</a><br> <a href="ferror.html">ferror</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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