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Next: <a href="String-Input-Conversions.html#String-Input-Conversions" accesskey="n" rel="next">String Input Conversions</a>, Previous: <a href="Table-of-Input-Conversions.html#Table-of-Input-Conversions" accesskey="p" rel="prev">Table of Input Conversions</a>, Up: <a href="C_002dStyle-I_002fO-Functions.html#C_002dStyle-I_002fO-Functions" accesskey="u" rel="up">C-Style I/O Functions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Numeric-Input-Conversions-1"></a>
<h4 class="subsection">14.2.14 Numeric Input Conversions</h4>

<p>This section describes the <code>scanf</code> conversions for reading numeric
values.
</p>
<p>The &lsquo;<samp>%d</samp>&rsquo; conversion matches an optionally signed integer in decimal
radix.
</p>
<p>The &lsquo;<samp>%i</samp>&rsquo; conversion matches an optionally signed integer in any of
the formats that the C language defines for specifying an integer
constant.
</p>
<p>For example, any of the strings &lsquo;<samp>10</samp>&rsquo;, &lsquo;<samp>0xa</samp>&rsquo;, or &lsquo;<samp>012</samp>&rsquo;
could be read in as integers under the &lsquo;<samp>%i</samp>&rsquo; conversion.  Each of
these specifies a number with decimal value <code>10</code>.
</p>
<p>The &lsquo;<samp>%o</samp>&rsquo;, &lsquo;<samp>%u</samp>&rsquo;, and &lsquo;<samp>%x</samp>&rsquo; conversions match unsigned
integers in octal, decimal, and hexadecimal radices, respectively.
</p>
<p>The &lsquo;<samp>%X</samp>&rsquo; conversion is identical to the &lsquo;<samp>%x</samp>&rsquo; conversion.  They
both permit either uppercase or lowercase letters to be used as digits.
</p>
<p>By default, integers are read as 32-bit quantities.  With the &lsquo;<samp>h</samp>&rsquo;
modifier, 16-bit integers are used, and with the &lsquo;<samp>l</samp>&rsquo; modifier,
64-bit integers are used.
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