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<a href="../index-2.html">cppreference.com</a> > <a href=
"index.html">Standard C Memory</a> > <a href=
"free.html">free</a>
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free
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<div class="syntax-name-format">
Syntax:
</div>
<pre class="syntax-box">
#include <cstdlib>
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="prettyprint">
typedef struct data_type {
int age;
char name[20];
} data;
data *willy;
willy = (data*) malloc( sizeof(*willy) );
...
free( willy );
</pre>
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<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>
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