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</div><div><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:c/language/initialization/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>When <a href="initialization.html" title="c/language/initialization">initializing</a> an object of <a href="compatible_type.html#Type_groups" title="c/language/type">scalar type</a>, the initializer must be a single expression
</p><p>The initializer for a scalar (an object of integer type including booleans and enumerated types, floating type including complex and imaginary, and pointer type including pointer to function) must be a single expression, optionally enclosed in braces:
</p>
<table class="t-sdsc-begin">
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<td colspan="10" class="t-sdsc-sep">
</td></tr>
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<td> <code><b>=</b></code> <span class="t-spar">expression</span>
</td>
<td> (1)
</td>
<td class="t-sdsc-nopad">
</td></tr>
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<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td> <code><b>=</b></code> <code><b>{ </b></code> <span class="t-spar">expression</span> <code><b>} </b></code>
</td>
<td> (2)
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<td class="t-sdsc-nopad">
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<td colspan="10" class="t-sdsc-sep">
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<p>The expression is evaluated, and its value, after <a href="conversion.html" title="c/language/conversion">conversion as if by assignment</a> to the type of the object, becomes the initial value of the object being initialized.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/scalar_initialization&action=edit&section=1" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>Because of the rules that apply to conversions as if by assignment, <a href="const.html" title="c/language/const">const</a> and <a href="volatile.html" title="c/language/volatile">volatile</a> qualifiers on the declared type are ignored when determining which type to convert the <span class="t-spar">expression</span> to.
</p><p>See <a href="initialization.html" title="c/language/initialization">initialization</a> for the rules that apply when no initializer is used.
</p><p>As with all other initializations, <span class="t-spar">expression</span> must be a <a href="constant_expression.html" title="c/language/constant expression">constant expression</a> when initializing objects of static or thread-local <a href="storage_duration.html" title="c/language/storage duration">storage duration</a>.
</p><p>The <span class="t-spar">expression</span> cannot be a <a href="operator_other.html#Comma_operator" title="c/language/operator other">comma operator</a> (unless parenthesized) because the comma at the top level would be interpreted as the beginning of the next declarator.
</p><p>When initializing objects of floating-point type, all computations for the objects with automatic <a href="storage_duration.html" title="c/language/storage duration">storage duration</a> are done as-if at execution time and are affected by the <a href="../numeric/fenv/FE_round.html" title="c/numeric/fenv/FE round">current rounding</a>; floating-point errors are reported as specified in <a href="../numeric/math/math_errhandling.html" title="c/numeric/math/math errhandling">math_errhandling</a>. For objects of static and thread-local storage duration, computations are done as-if at compile time, and no exceptions are raised:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="kw4">void</span> f<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co2">#pragma STDC FENV_ACCESS ON</span>
<span class="kw4">static</span> <span class="kw4">float</span> v <span class="sy1">=</span> <span class="nu19">1.1e75</span><span class="sy4">;</span> <span class="co1">// does not raise exceptions: static init</span>
 
<span class="kw4">float</span> u<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="br0">{</span> <span class="nu19">1.1e75</span> <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// raises FE_INEXACT</span>
<span class="kw4">float</span> w <span class="sy1">=</span> <span class="nu19">1.1e75</span><span class="sy4">;</span> <span class="co1">// raises FE_INEXACT</span>
 
<span class="kw4">double</span> x <span class="sy1">=</span> <span class="nu19">1.1e75</span><span class="sy4">;</span> <span class="co1">// may raise FE_INEXACT (depends on FLT_EVAL_METHOD)</span>
<span class="kw4">float</span> y <span class="sy1">=</span> 1.1e75f<span class="sy4">;</span> <span class="co1">// may raise FE_INEXACT (depends on FLT_EVAL_METHOD)</span>
 
<span class="kw4">long</span> <span class="kw4">double</span> z <span class="sy1">=</span> <span class="nu19">1.1e75</span><span class="sy4">;</span> <span class="co1">// does not raise exceptions (conversion is exact)</span>
<span class="br0">}</span></pre></div></div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/scalar_initialization&action=edit&section=2" 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="c source-c"><pre class="de1"><span class="co2">#include <stdbool.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>
bool b <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
<span class="kw4">const</span> <span class="kw4">double</span> d <span class="sy1">=</span> <span class="nu16">3.14</span><span class="sy4">;</span>
<span class="kw4">int</span> k <span class="sy1">=</span> <span class="nu16">3.15</span><span class="sy4">;</span> <span class="co1">// conversion from double to int</span>
<span class="kw4">int</span> n <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">12</span><span class="br0">}</span>, <span class="co1">// optional braces</span>
<span class="sy2">*</span>p <span class="sy1">=</span> <span class="sy3">&</span>n, <span class="co1">// non-constant expression OK for automatic variable</span>
<span class="br0">(</span><span class="sy2">*</span>fp<span class="br0">)</span><span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span> <span class="sy1">=</span> main<span class="sy4">;</span>
<span class="kw2">enum</span> <span class="br0">{</span>RED, BLUE<span class="br0">}</span> e <span class="sy1">=</span> RED<span class="sy4">;</span> <span class="co1">// enumerations are scalar types as well</span>
<span class="br0">}</span></pre></div></div>
<p><br />
</p>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/scalar_initialization&action=edit&section=3" 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> 6.7.9/11 Initialization (p: 140)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999):
</li></ul>
<dl><dd><ul><li> 6.7.8/11 Initialization (p: 126)
</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> 3.5.7/8 Initialization
</li></ul>
</dd></dl>
</div></div>
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