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<a name="atoll_002d_002d_002dconvert-a-string-to-a-long-long-integer"></a>
<h3 class="section">2.9 <code>atoll</code>—convert a string to a long long integer</h3>
<a name="index-atoll"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <stdlib.h>
long long atoll(const char *<var>str</var>);
long long _atoll_r(struct _reent *<var>ptr</var>, const char *<var>str</var>);
</pre></div>
<p><strong>Description</strong><br>
The function <code>atoll</code> converts the initial portion of the string
pointed to by <code>*<var>str</var></code> to a type <code>long long</code>. A call to
atoll(str) in this implementation is equivalent to
strtoll(str, (char **)NULL, 10) including behavior on error.
</p>
<p>The alternate function <code>_atoll_r</code> is a reentrant version. The
extra argument <var>reent</var> is a pointer to a reentrancy structure.
</p>
<br>
<p><strong>Returns</strong><br>
The converted value.
</p>
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<p><strong>Portability</strong><br>
<code>atoll</code> is ISO 9899 (C99) and POSIX 1003.1-2001 compatable.
</p>
<p>No supporting OS subroutines are required.
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