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<a name="atoi_002c-atol_002d_002d_002dstring-to-integer"></a>
<h3 class="section">2.8 <code>atoi</code>, <code>atol</code>&mdash;string to integer</h3>
<a name="index-atoi"></a>
<a name="index-atol"></a>
<a name="index-_005fatoi_005fr"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdlib.h&gt;
int atoi(const char *<var>s</var>);
long atol(const char *<var>s</var>);
int _atoi_r(struct _reent *<var>ptr</var>, const char *<var>s</var>);
long _atol_r(struct _reent *<var>ptr</var>, const char *<var>s</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>atoi</code> converts the initial portion of a string to an <code>int</code>.
<code>atol</code> converts the initial portion of a string to a <code>long</code>.
</p>
<p><code>atoi(s)</code> is implemented as <code>(int)strtol(s, NULL, 10).</code>
<code>atol(s)</code> is implemented as <code>strtol(s, NULL, 10).</code>
</p>
<p><code>_atoi_r</code> and <code>_atol_r</code> are reentrant versions of <code>atoi</code> and
<code>atol</code> respectively, passing the reentrancy struct pointer.
</p>
<br>
<p><strong>Returns</strong><br>
The functions return the converted value, if any. If no conversion was
made, <code>0</code> is returned.
</p>
<br>
<p><strong>Portability</strong><br>
<code>atoi</code>, <code>atol</code> are ANSI.
</p>
<p>No supporting OS subroutines are required.
</p>
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