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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
    "index.html">Standard C String and Character</a> &gt; <a href=
    "atoi.html">atoi</a>
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    atoi
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    Syntax:
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  <pre class="syntax-box">
  #include &lt;cstdlib&gt;
  int atoi( const char *str );
</pre>

  <p>The atoi() function converts <em>str</em> into an integer, and
  returns that integer. <em>str</em> should start with whitespace or
  some sort of number, and atoi() will stop reading from <em>str</em>
  as soon as a non-numerical character has been read.  For example:</p>

<pre class="prettyprint">
  int i;
  i = atoi( &quot;512&quot; );
  i = atoi( &quot;512.035&quot; );
  i = atoi( &quot;   512.035&quot; );
  i = atoi( &quot;   512+34&quot; );
  i = atoi( &quot;   512 bottles of beer on the wall&quot; );
</pre>

  <p>All five of the above assignments to the variable <em>i</em> would
  result in it being set to 512.</p>

  <p>If the conversion cannot be performed, then atoi() will return
  zero:</p>
<pre class="prettyprint">
  int i = atoi( &quot; does not work: 512&quot; );  // results in i == 0
</pre>

  <p>You can use <a href= "../stdio/sprintf.html">sprintf</a>() to
  convert a number into a string.</p>

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    Related topics:
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    <a href="atof.html">atof</a><br>
    <a href="atol.html">atol</a><br>
    (Standard C I/O) <a href="../stdio/sprintf.html">sprintf</a>
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