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Next: <a href="String-Input-Conversions.html" accesskey="n" rel="next">String Input Conversions</a>, Previous: <a href="Table-of-Input-Conversions.html" accesskey="p" rel="prev">Table of Input Conversions</a>, Up: <a href="C_002dStyle-I_002fO-Functions.html" accesskey="u" rel="up">C-Style I/O Functions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<span id="Numeric-Input-Conversions-1"></span><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 ‘<samp>%d</samp>’ conversion matches an optionally signed integer in decimal
radix.
</p>
<p>The ‘<samp>%i</samp>’ 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 ‘<samp>10</samp>’, ‘<samp>0xa</samp>’, or ‘<samp>012</samp>’
could be read in as integers under the ‘<samp>%i</samp>’ conversion. Each of
these specifies a number with decimal value <code>10</code>.
</p>
<p>The ‘<samp>%o</samp>’, ‘<samp>%u</samp>’, and ‘<samp>%x</samp>’ conversions match unsigned
integers in octal, decimal, and hexadecimal radices, respectively.
</p>
<p>The ‘<samp>%X</samp>’ conversion is identical to the ‘<samp>%x</samp>’ 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 ‘<samp>h</samp>’
modifier, 16-bit integers are used, and with the ‘<samp>l</samp>’ modifier,
64-bit integers are used.
</p>
<p>The ‘<samp>%e</samp>’, ‘<samp>%f</samp>’, ‘<samp>%g</samp>’, ‘<samp>%E</samp>’, and ‘<samp>%G</samp>’ conversions
match optionally signed floating-point numbers. All five conversion
specifications behave identically, and will read in numerical values of
any floating point display style.
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