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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>free</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 Memory</a> > <a href= "free.html">free</a> </div> <div class="name-format"> free </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <stdlib.h> void free( void* ptr );</pre> <p>The free() function deallocates the space pointed to by <em>ptr</em>, freeing it up for future use. <em>ptr</em> must have been used in a previous call to <a href="malloc.html">malloc</a>(), <a href="calloc.html">calloc</a>(), or <a href= "realloc.html">realloc</a>(). An example:</p> <pre class="example-code"> typedef struct data_type { int age; char name[20]; } data; data *willy; willy = (data*) malloc( sizeof(*willy) ); ... free( willy ); </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="calloc.html">calloc</a><br> (C/C++ Keywords) <a href="../keywords/delete.html">delete</a><br> <a href="malloc.html">malloc</a><br> (C/C++ Keywords) <a href="../keywords/new.html">new</a><br> <a href="realloc.html">realloc</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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