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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>scanf, <span style="font-size:0.7em; line-height:130%">std::</span>fscanf, <span style="font-size:0.7em; line-height:130%">std::</span>sscanf</h1>
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<tr class="t-nv-h2"><td colspan="5"> File I/O </td></tr>
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<tr class="t-nv-h2"><td colspan="5"> String I/O </td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Array I/O </td></tr>
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<tr class="t-nv-h1"><td colspan="5"> Error category interface </td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Unformatted input/output</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="gets.html" title="cpp/io/c/gets"><span class="t-lines"><span>gets</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx14">(until C++14)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fgetwc.html" title="cpp/io/c/fgetwc"><span class="t-lines"><span>fgetwc</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fgetws.html" title="cpp/io/c/fgetws"><span class="t-lines"><span>fgetws</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fputwc.html" title="cpp/io/c/fputwc"><span class="t-lines"><span>fputwc</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="getwchar.html" title="cpp/io/c/getwchar"><span class="t-lines"><span>getwchar</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="putwchar.html" title="cpp/io/c/putwchar"><span class="t-lines"><span>putwchar</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ungetwc.html" title="cpp/io/c/ungetwc"><span class="t-lines"><span>ungetwc</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Formatted input/output</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>scanf</span><span>fscanf</span><span>sscanf</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfscanf.html" title="cpp/io/c/vfscanf"><span class="t-lines"><span>vscanf</span><span>vfscanf</span><span>vsscanf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="printf.html" title="cpp/io/c/fprintf"><span class="t-lines"><span>printf</span><span>fprintf</span><span>sprintf</span><span>snprintf</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfprintf.html" title="cpp/io/c/vfprintf"><span class="t-lines"><span>vprintf</span><span>vfprintf</span><span>vsprintf</span><span>vsnprintf</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fwscanf.html" title="cpp/io/c/fwscanf"><span class="t-lines"><span>wscanf</span><span>fwscanf</span><span>swscanf</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfwscanf.html" title="cpp/io/c/vfwscanf"><span class="t-lines"><span>vwscanf</span><span>vfwscanf</span><span>vswscanf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fwprintf.html" title="cpp/io/c/fwprintf"><span class="t-lines"><span>wprintf</span><span>fwprintf</span><span>swprintf</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="vfwprintf.html" title="cpp/io/c/vfwprintf"><span class="t-lines"><span>vwprintf</span><span>vfwprintf</span><span>vswprintf</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> File positioning</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ftell.html" title="cpp/io/c/ftell"><span class="t-lines"><span>ftell</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fgetpos.html" title="cpp/io/c/fgetpos"><span class="t-lines"><span>fgetpos</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fseek.html" title="cpp/io/c/fseek"><span class="t-lines"><span>fseek</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fsetpos.html" title="cpp/io/c/fsetpos"><span class="t-lines"><span>fsetpos</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="rewind.html" title="cpp/io/c/rewind"><span class="t-lines"><span>rewind</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Error handling</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="clearerr.html" title="cpp/io/c/clearerr"><span class="t-lines"><span>clearerr</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="feof.html" title="cpp/io/c/feof"><span class="t-lines"><span>feof</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ferror.html" title="cpp/io/c/ferror"><span class="t-lines"><span>ferror</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="perror.html" title="cpp/io/c/perror"><span class="t-lines"><span>perror</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Operations on files</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="remove.html" title="cpp/io/c/remove"><span class="t-lines"><span>remove</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="rename.html" title="cpp/io/c/rename"><span class="t-lines"><span>rename</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tmpfile.html" title="cpp/io/c/tmpfile"><span class="t-lines"><span>tmpfile</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tmpnam.html" title="cpp/io/c/tmpnam"><span class="t-lines"><span>tmpnam</span></span></a></div></div></td></tr>
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<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><a href="../../header/cstdio.html" title="cpp/header/cstdio"><cstdio></a></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> scanf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> format, ... <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fscanf<span class="br0">(</span> <a href="../c.html"><span class="kw1598">std::<span class="me2">FILE</span></span></a><span class="sy2">*</span> stream, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> format, ... <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> sscanf<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> buffer, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> format, ... <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Reads data from the a variety of sources, interprets it according to <code>format</code> and stores the results into given locations.
</p>
<div class="t-li1"><span class="t-li">1)</span> Reads the data from <span class="t-lc">stdin</span></div>
<div class="t-li1"><span class="t-li">2)</span> Reads the data from file stream <code>stream</code></div>
<div class="t-li1"><span class="t-li">3)</span> Reads the data from null-terminated character string <code>buffer</code></div>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="scanf.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="scanf.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="scanf.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="scanf.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="scanf.html#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/c/fscanf&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> stream
</td>
<td> -
</td>
<td> input file stream to read from
</td></tr>
<tr class="t-par">
<td> buffer
</td>
<td> -
</td>
<td> pointer to a null-terminated character string to read from
</td></tr>
<tr class="t-par">
<td> format
</td>
<td> -
</td>
<td> pointer to a null-terminated character string specifying how to read the input.
<p>The format string consists of whitespace characters (any single whitespace character in the format string consumes all available consecutive whitespace characters from the input), non-whitespace multibyte characters except <code><b>%</b></code> (each such character in the format string consumes exactly one identical character from the input) and conversion specifications. Each conversion specification has the following format:
</p>
<dl><dd><ul><li> introductory <code><b>%</b></code> character
</li></ul>
</dd></dl>
<dl><dd><ul><li> <span class="t-mark">(optional)</span> assignment-suppressing character <code><b>*</b></code>. If this option is present, the function does not assign the result of the conversion to any receiving argument.
</li></ul>
</dd></dl>
<dl><dd><ul><li> <span class="t-mark">(optional)</span> integer number (greater than zero) that specifies <i>maximum field width</i>, that is, the maximum number of characters that the function is allowed to consume when doing the conversion specified by the current conversion specification. Note that %s and %[ may lead to buffer overflow if the width is not provided.
</li></ul>
</dd></dl>
<dl><dd><ul><li> <span class="t-mark">(optional)</span> <i>length modifier</i> that specifies the size of the receiving argument, that is, the actual destination type. This affects the conversion accuracy and overflow rules. The default destination type is different for each conversion type (see table below).
</li></ul>
</dd></dl>
<dl><dd><ul><li> conversion format specifier
</li></ul>
</dd></dl>
<p>The following format specifiers are available:
</p>
<table class="wikitable" style="text-align:center; font-size:85%; max-width:90em;">
<tr>
<th rowspan="1"> Conversion<br /> specifier
</th>
<th rowspan="1"> Explanation
</th>
<th colspan="9"> Argument type
</th></tr>
<tr>
<th colspan="2" style="text-align:right; font-weight:normal;"> length modifier
</th>
<th> <code>hh</code>
</th>
<th> <code>h</code>
</th>
<th style="font-weight:normal;"> (none)
</th>
<th> <code><b>l</b></code>
</th>
<th> <code><b>ll</b></code>
</th>
<th> <code><b>j</b></code>
</th>
<th> <code><b>z</b></code>
</th>
<th> <code><b>t</b></code>
</th>
<th> <code><b>L</b></code>
</th></tr>
<tr>
<th> <code>%</code>
</th>
<td style="text-align:left;"> matches literal <code><b>%</b></code>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr>
<tr>
<th> <code>c</code>
</th>
<td style="text-align:left;">
<dl><dd> matches a <b>character</b> or a sequence of <b>characters</b>
</dd></dl>
<p>If a width specifier is used, matches exactly <i>width</i> characters (the argument must be a pointer to an array with sufficient room). Unlike %s and %[, does not append the null character to the array.
</p>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="3"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td rowspan="3" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr>
<tr>
<th> <code>s</code>
</th>
<td style="text-align:left;">
<dl><dd> matches a sequence of non-whitespace characters (a <b>string</b>)
</dd></dl>
<p>If width specifier is used, matches up to <i>width</i> or until the first whitespace character, whichever appears first. Always stores a null character in addition to the characters matched (so the argument array must have room for at least <i>width+1</i> characters)
</p>
</td></tr>
<tr>
<th> <code>[</code><span class="t-spar">set</span><code>]</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a non-empty sequence of character from <span class="t-spar">set</span> of characters.
</dd></dl>
<p>If the first character of the set is <code>^</code>, then all characters not in the set are matched. If the set begins with <code>]</code> or <code>^]</code> then the <code>]</code> character is also included into the set. It is implementation-defined whether the character <code>-</code> in the non-initial position in the scanset may be indicating a range, as in <code>[0-9]</code>. If width specifier is used, matches only up to <i>width</i>. Always stores a null character in addition to the characters matched (so the argument array must have room for at least <i>width+1</i> characters)
</p>
</td></tr>
<tr>
<th> <code>d</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a <b>decimal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../../string/byte/strtol.html" title="cpp/string/byte/strtol"><tt>strtol()</tt></a> with the value <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">10</span></span></span> for the <code>base</code> argument
</p>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">signed</span> <span class="kw4">char</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">signed</span> <span class="kw4">short</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">short</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">signed</span> <span class="kw4">int</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">int</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">signed</span> <span class="kw4">long</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">signed</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp">intmax_t<span class="sy2">*</span></span></span> or <span class="t-c"><span class="mw-geshi cpp source-cpp">uintmax_t<span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp">size_t<span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6"> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp">ptrdiff_t<span class="sy2">*</span></span></span></div></div>
</td>
<td rowspan="6" style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr>
<tr>
<th> <code>i</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an <b>integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../../string/byte/strtol.html" title="cpp/string/byte/strtol"><tt>strtol()</tt></a> with the value <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">0</span></span></span> for the <code>base</code> argument (base is determined by the first characters parsed)
</p>
</td></tr>
<tr>
<th> <code>u</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a <b>unsigned integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../../string/byte/strtoul.html" title="cpp/string/byte/strtoul"><tt>strtoul()</tt></a> with the value <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">0</span></span></span> for the <code>base</code> argument (base is determined by the first characters parsed)
</p>
</td></tr>
<tr>
<th> <code>o</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an <b>octal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../../string/byte/strtoul.html" title="cpp/string/byte/strtoul"><tt>strtoul()</tt></a> with the value <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">8</span></span></span> for the <code>base</code> argument
</p>
</td></tr>
<tr>
<th> <code>x</code>
</th>
<td style="text-align:left;">
<dl><dd>matches an <b>hexadecimal integer</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../../string/byte/strtoul.html" title="cpp/string/byte/strtoul"><tt>strtoul()</tt></a> with the value <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">16</span></span></span> for the <code>base</code> argument
</p>
</td></tr>
<tr>
<th> <code>n</code>
</th>
<td style="text-align:left;">
<dl><dd>returns the <b>number of characters read so far</b>.
</dd></dl>
<p>No input is consumed. Does not increment the assignment count. If the specifier has assignment-suppressing operator defined, the behavior is undefined
</p>
</td></tr>
<tr>
<th> <code>a</code>, <code>A</code><br /> <code>e</code>, <code>E</code><br /> <code>f</code>, <code>F</code><br /> <code>g</code>, <code>G</code>
</th>
<td style="text-align:left;">
<dl><dd>matches a <b>floating-point number</b>.
</dd></dl>
<p>The format of the number is the same as expected by <a href="../../string/byte/strtof.html" title="cpp/string/byte/strtof"><tt>strtof()</tt></a>
</p>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span><span class="sy2">*</span></span></span></div></div>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span><span class="sy2">*</span></span></span></div></div>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span><span class="sy2">*</span></span></span></div></div>
</td></tr>
<tr>
<th> <code>p</code>
</th>
<td style="text-align:left;">
<dl><dd>matches implementation defined character sequence defining a <b>pointer</b>.
</dd></dl>
<p><code>printf</code> family of functions should produce the same sequence using <code><b>%p</b></code> format specifier
</p>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td> <div class="t-vertical"><div><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span><span class="sy2">**</span></span></span></div></div>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td>
<td style="background: #ececec; color: grey; vertical-align: middle; text-align: center;" class="table-na"> <small>N/A</small>
</td></tr></table>
<p>All conversion specifiers other than <code>[</code>, <code>c</code>, and <code>n</code> consume and discard all leading whitespace characters (determined as if by calling <a href="../../string/byte/isspace.html" title="cpp/string/byte/isspace"><tt>isspace</tt></a>) before attempting to parse the input. These consumed characters do not count towards the specified maximum field width.
</p><p>The conversion specifiers <code>lc</code>, <code>ls</code>, and <code>l[</code> perform multibyte-to-wide character conversion as if by calling <a href="../../string/multibyte/wcrtomb.html" title="cpp/string/multibyte/wcrtomb"><tt>wcrtomb()</tt></a> with an <a href="../../string/multibyte/mbstate_t.html" title="cpp/string/multibyte/mbstate t"><tt>mbstate_t</tt></a> object initialized to zero before the first character is converted.
</p><p>The conversion specifiers <code>s</code> and <code>[</code> always store the null terminator in addition to the matched characters. The size of the destination array must be at least one greater than the specified field width.
</p><p>The correct conversion specifications for the <a href="../../types/integer.html" title="cpp/types/integer">fixed-width integer types</a> (<code>int8_t</code>, etc) are defined in the header <a href="../../types/integer.html" title="cpp/types/integer"><cinttypes></a>(C++) or <a href="../../../c/types/integer.html" title="c/types/integer"><inttypes.h></a> (C) (although <a href="../../types/integer.html" title="cpp/types/integer"><tt>SCNdMAX</tt></a>, <a href="../../types/integer.html" title="cpp/types/integer"><tt>SCNuMAX</tt></a>, etc is synonymous with <code>%jd</code>, <code>%ju</code>, etc).
</p><p><br />
</p>
</td></tr>
<tr class="t-par">
<td> ...
</td>
<td> -
</td>
<td> receiving arguments
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/c/fscanf&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>Number of receiving arguments successfully assigned, or <span class="t-lc">EOF</span> if read failure occurs before the first receiving argument was assigned.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/c/fscanf&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>Because most conversion specifiers first consume all consecutive whitespace, code such as
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">std<span class="sy4">::</span><span class="me2">scanf</span><span class="br0">(</span><span class="st0">"%d"</span>, <span class="sy3">&</span>a<span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">scanf</span><span class="br0">(</span><span class="st0">"%d"</span>, <span class="sy3">&</span>b<span class="br0">)</span><span class="sy4">;</span></pre></div></div>
<p>will read two integers that are entered on different lines (second %d will consume the newline left over by the first) or on the same line, separated by spaces or tabs (second %d will consume the spaces or tabs).
</p>
The conversion specifiers that do not consume leading whitespace, such as %c, can be made to do so by using a whitespace character in the format string: <div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">std<span class="sy4">::</span><span class="me2">scanf</span><span class="br0">(</span><span class="st0">"%d"</span>, <span class="sy3">&</span>a<span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">scanf</span><span class="br0">(</span><span class="st0">" %c"</span>, <span class="sy3">&</span>c<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// ignore the endline after %d, then read a char</span></pre></div></div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/c/fscanf&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <iostream></span>
<span class="co2">#include <clocale></span>
<span class="co2">#include <cstdio></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">int</span> i, j<span class="sy4">;</span>
<span class="kw4">float</span> x, y<span class="sy4">;</span>
<span class="kw4">char</span> str1<span class="br0">[</span><span class="nu0">10</span><span class="br0">]</span>, str2<span class="br0">[</span><span class="nu0">4</span><span class="br0">]</span><span class="sy4">;</span>
<span class="kw4">wchar_t</span> warr<span class="br0">[</span><span class="nu0">2</span><span class="br0">]</span><span class="sy4">;</span>
<a href="../../locale/setlocale.html"><span class="kw1711">std::<span class="me2">setlocale</span></span></a><span class="br0">(</span><a href="../../locale/LC_categories.html"><span class="kw1714">LC_ALL</span></a>, <span class="st0">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
 
<span class="kw4">char</span> input<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> u8<span class="st0">"25 54.32E-1 Thompson 56789 0123 56ß水"</span><span class="sy4">;</span>
<span class="co1">// parse as follows:</span>
<span class="co1">// %d: an integer </span>
<span class="co1">// %f: a floating-point value</span>
<span class="co1">// %9s: a string of at most 9 non-whitespace characters</span>
<span class="co1">// %2d: two-digit integer (digits 5 and 6)</span>
<span class="co1">// %f: a floating-point value (digits 7, 8, 9)</span>
<span class="co1">// %*d an integer which isn't stored anywhere</span>
<span class="co1">// ' ': all consecutive whitespace</span>
<span class="co1">// %3[0-9]: a string of at most 3 digits (digits 5 and 6)</span>
<span class="co1">// %2lc: two wide characters, using multibyte to wide conversion</span>
<span class="kw4">int</span> ret <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">sscanf</span><span class="br0">(</span>input, <span class="st0">"%d%f%9s%2d%f%*d %3[0-9]%2lc"</span>,
<span class="sy3">&</span>i, <span class="sy3">&</span>x, str1, <span class="sy3">&</span>j, <span class="sy3">&</span>y, str2, warr<span class="br0">)</span><span class="sy4">;</span>
 
<a href="../cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Converted "</span> <span class="sy1"><<</span> ret <span class="sy1"><<</span> <span class="st0">" fields:<span class="es1">\n</span>"</span>
<span class="sy1"><<</span> <span class="st0">"i = "</span> <span class="sy1"><<</span> i <span class="sy1"><<</span> <span class="st0">"<span class="es1">\n</span>x = "</span> <span class="sy1"><<</span> x <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">"str1 = "</span> <span class="sy1"><<</span> str1 <span class="sy1"><<</span> <span class="st0">"<span class="es1">\n</span>j = "</span> <span class="sy1"><<</span> j <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">"y = "</span> <span class="sy1"><<</span> y <span class="sy1"><<</span> <span class="st0">"<span class="es1">\n</span>str2 = "</span> <span class="sy1"><<</span> str2 <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <a href="../manip/hex.html"><span class="kw1505">std::<span class="me2">hex</span></span></a> <span class="sy1"><<</span> <span class="st0">"warr[0] = U+"</span> <span class="sy1"><<</span> warr<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>
<span class="sy1"><<</span> <span class="st0">" warr[1] = U+"</span> <span class="sy1"><<</span> warr<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Converted 7 fields:
i = 25
x = 5.432
str1 = Thompson
j = 56
y = 789
str2 = 56
warr[0] = U+df warr[1] = U+6c34</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/io/c/fscanf&action=edit&section=5" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="vfscanf.html" title="cpp/io/c/vfscanf"> <span class="t-lines"><span>vscanf</span><span>vfscanf</span><span>vsscanf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> reads formatted input from <span class="t-lc">stdin</span>, a file stream or a buffer<br /> using variable argument list <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/c/dsc_vfscanf&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="fgets.html" title="cpp/io/c/fgets"> <span class="t-lines"><span>fgets</span></span></a></div></div>
</td>
<td> gets a character string from a file stream <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/c/dsc_fgets&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="printf.html" title="cpp/io/c/fprintf"> <span class="t-lines"><span>printf</span><span>fprintf</span><span>sprintf</span><span>snprintf</span></span></a></div><div><span class="t-lines"><span></span><span></span><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> prints formatted output to <span class="t-lc">stdout</span>, a file stream or a buffer <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/c/dsc_fprintf&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td colspan="2"> <div class="t-dsc-see"><span><a href="../../../c/io/fscanf.html" title="c/io/fscanf">C documentation</a></span> for <span class="t-dsc-see-tt"><span>scanf</span>, <span>fscanf</span>, <span>sscanf</span></span></div>
</td></tr>
</table>
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