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<h4 class="subsection" id="Numeric-Input-Conversions-1"><span>14.2.14 Numeric Input Conversions<a class="copiable-link" href="#Numeric-Input-Conversions-1"> ¶</a></span></h4>
<p>This section describes the <code class="code">scanf</code> conversions for reading numeric
values.
</p>
<p>The ‘<samp class="samp">%d</samp>’ conversion matches an optionally signed integer in decimal
radix.
</p>
<p>The ‘<samp class="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 class="samp">10</samp>’, ‘<samp class="samp">0xa</samp>’, or ‘<samp class="samp">012</samp>’
could be read in as integers under the ‘<samp class="samp">%i</samp>’ conversion. Each of
these specifies a number with decimal value <code class="code">10</code>.
</p>
<p>The ‘<samp class="samp">%o</samp>’, ‘<samp class="samp">%u</samp>’, and ‘<samp class="samp">%x</samp>’ conversions match unsigned
integers in octal, decimal, and hexadecimal radices, respectively.
</p>
<p>The ‘<samp class="samp">%X</samp>’ conversion is identical to the ‘<samp class="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 class="samp">h</samp>’
modifier, 16-bit integers are used, and with the ‘<samp class="samp">l</samp>’ modifier,
64-bit integers are used.
</p>
<p>The ‘<samp class="samp">%e</samp>’, ‘<samp class="samp">%f</samp>’, ‘<samp class="samp">%g</samp>’, ‘<samp class="samp">%E</samp>’, and ‘<samp class="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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