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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>sizeof</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="alignof.html" title="c/language/ Alignof"><span class="t-lines"><span>alignof</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
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<p>Queries size of the object or type
</p><p>Used when actual size of the object must be known
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="sizeof.html#Syntax"><span class="tocnumber">1</span> <span class="toctext">Syntax</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="sizeof.html#Explanation"><span class="tocnumber">2</span> <span class="toctext">Explanation</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="sizeof.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="sizeof.html#Keywords"><span class="tocnumber">4</span> <span class="toctext">Keywords</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="sizeof.html#Example"><span class="tocnumber">5</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="sizeof.html#References"><span class="tocnumber">6</span> <span class="toctext">References</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="sizeof.html#See_also"><span class="tocnumber">7</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=c/language/sizeof&action=edit&section=1" title="Edit section: Syntax">edit</a>]</span> <span class="mw-headline" id="Syntax">Syntax</span></h3>
<table class="t-sdsc-begin">
<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>sizeof(</b></code> <span class="t-spar">type</span> <code><b>)</b></code>
</td>
<td> (1)
</td>
<td class="t-sdsc-nopad">
</td></tr>
<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>sizeof</b></code> <span class="t-spar">expression</span> <code></code>
</td>
<td> (2)
</td>
<td class="t-sdsc-nopad">
</td></tr>
<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr></table>
<p>Both versions return a value of type <span class="t-lc"><a href="../types/size_t.html" title="c/types/size t">size_t</a></span>.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/sizeof&action=edit&section=2" title="Edit section: Explanation">edit</a>]</span> <span class="mw-headline" id="Explanation">Explanation</span></h3>
<div class="t-li1"><span class="t-li">1)</span> Returns the size, in bytes, of the <a href="object.html#Object_representation" title="c/language/object">object representation</a> of <span class="t-spar">type</span></div>
<div class="t-li1"><span class="t-li">2)</span> Returns the size, in bytes, of the object representation of the type of <span class="t-spar">expression</span></div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/sizeof&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>Depending on the computer architecture, a <a href="http://en.wikipedia.com/wiki/Byte" class="extiw" title="enwiki:Byte">byte</a> may consist of 8 or more bits, the exact number provided as <span class="t-lc"><a href="../types/limits.html" title="c/types/limits">CHAR_BIT</a></span>.
</p><p><span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">char</span><span class="br0">)</span></span></span>, <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">signed</span> <span class="kw4">char</span><span class="br0">)</span></span></span>, and <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="br0">)</span></span></span> always return <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span>.
</p><p>sizeof cannot be used with function types, incomplete types (including <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">void</span></span></span>), or <a href="bit_field.html" title="c/language/bit field">bit field</a> lvalues.
</p><p>When applied to an operand that has <a href="struct.html" title="c/language/struct">structure</a> or <a href="union.html" title="c/language/union">union</a> type, the result is the total number of bytes in such an object, including internal and trailing padding. The trailing padding is such that if the object were an element of an array, the alignment requirement of the next element of this array would be satisfied, in other words, sizeof(T) returns the size of an element of a T[] array.
</p><p><span class="t-rev-inl t-since-c99"><span>Except if the type of <span class="t-spar">expression</span> is a <a href="array.html" title="c/language/array">VLA</a>, </span> <span><span class="t-mark-rev t-since-c99">(since C99)</span></span></span><span class="t-spar">expression</span> is not evaluated and the <code>sizeof</code> operator may be used in an integer <a href="constant_expression.html" title="c/language/constant expression">constant expression</a>.
</p>
<table class="t-rev-begin">
<tr class="t-rev t-since-c99"><td>
If the type of <span class="t-spar">expression</span> is a <a href="array.html" title="c/language/array">variable-length array</a> type, <span class="t-spar">expression</span> is evaluated and the size of the array it evaluates to is calculated at run time.</td>
<td><span class="t-mark-rev t-since-c99">(since C99)</span></td></tr>
</table>
<p>Number of elements in any <a href="array.html" title="c/language/array">array</a> <span class="t-c"><span class="mw-geshi c source-c">a</span></span> <span class="t-rev-inl t-since-c99"><span>including VLA</span> <span><span class="t-mark-rev t-since-c99">(since C99)</span></span></span> may be determined with the expression <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">sizeof</span> a <span class="sy2">/</span> <span class="kw4">sizeof</span> a<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span></span></span>. Note that if <span class="t-c"><span class="mw-geshi c source-c">a</span></span> has pointer type (such as after array-to-pointer conversion of function parameter type adjustment), this expression would simply divide the number of bytes in a pointer type by the number of bytes in the pointed type.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/sizeof&action=edit&section=4" title="Edit section: Keywords">edit</a>]</span> <span class="mw-headline" id="Keywords">Keywords</span></h3>
<p><a href="../keyword/sizeof.html" title="c/keyword/sizeof"><tt>sizeof</tt></a>
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/sizeof&action=edit&section=5" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><p> sample output corresponds to a platform with 64-bit pointers and 32-bit int
</p><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="c source-c"><pre class="de1"><span class="co2">#include <stdio.h></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// type argument:</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof(float) = %zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">float</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof(void(*)(void)) = %zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">void</span><span class="br0">(</span><span class="sy2">*</span><span class="br0">)</span><span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof(char[10]) = %zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span><span class="br0">(</span><span class="kw4">char</span><span class="br0">[</span><span class="nu0">10</span><span class="br0">]</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// printf("sizeof(void(void)) = %zu\n", sizeof(void(void))); // Error: function type</span>
<span class="co1">// printf("sizeof(char[]) = %zu\n", sizeof(char[])); // Error: incomplete type</span>
 
<span class="co1">// expression argument:</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof 'a' = %zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span> <span class="st0">'a'</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// type of 'a' is int</span>
<span class="co1">// printf("sizeof main = %zu\n", sizeof main); // Error: Function type</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof &main = %zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span> <span class="sy3">&</span>main<span class="br0">)</span><span class="sy4">;</span>
<a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"sizeof <span class="es1">\"</span>hello<span class="es1">\"</span> = %zu<span class="es1">\n</span>"</span>, <span class="kw4">sizeof</span> <span class="st0">"hello"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// type is char[6]</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">sizeof(float) = 4
sizeof(void(*)(void)) = 8
sizeof(char[10]) = 10
sizeof 'a' = 4
sizeof &main = 8
sizeof "hello" = 6</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/sizeof&action=edit&section=6" title="Edit section: References">edit</a>]</span> <span class="mw-headline" id="References">References</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011):
</li></ul>
<dl><dd><ul><li> 6.5.3.4 The sizeof and _Alignof operators (p: 90-91)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999):
</li></ul>
<dl><dd><ul><li> 6.5.3.4 The sizeof operator (p: 80-81)
</li></ul>
</dd></dl>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990):
</li></ul>
<dl><dd><ul><li> 3.3.3.4 The sizeof operator
</li></ul>
</dd></dl>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/sizeof&action=edit&section=7" 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 colspan="2"> <div class="t-dsc-see"><span><a href="../../cpp/language/sizeof.html" title="cpp/language/sizeof">C++ documentation</a></span> for <span class="t-dsc-see-tt"><span>sizeof operator</span></span></div>
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