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<title>Characters implementation - Using the GNU Compiler Collection (GCC)</title>
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<a name="Characters-implementation"></a>
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Next: <a rel="next" accesskey="n" href="Integers-implementation.html#Integers-implementation">Integers implementation</a>,
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Previous: <a rel="previous" accesskey="p" href="Identifiers-implementation.html#Identifiers-implementation">Identifiers implementation</a>,
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Up: <a rel="up" accesskey="u" href="C-Implementation.html#C-Implementation">C Implementation</a>
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<h3 class="section">4.4 Characters</h3>
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<ul>
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<li><cite>The number of bits in a byte (C90 3.4, C99 and C11 3.6).</cite>
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<p>Determined by ABI.
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<li><cite>The values of the members of the execution character set (C90,
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C99 and C11 5.2.1).</cite>
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<p>Determined by ABI.
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<li><cite>The unique value of the member of the execution character set produced
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for each of the standard alphabetic escape sequences (C90, C99 and C11
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5.2.2).</cite>
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<p>Determined by ABI.
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<li><cite>The value of a </cite><code>char</code><cite> object into which has been stored any
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character other than a member of the basic execution character set
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(C90 6.1.2.5, C99 and C11 6.2.5).</cite>
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<p>Determined by ABI.
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<li><cite>Which of </cite><code>signed char</code><cite> or </cite><code>unsigned char</code><cite> has the same
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range, representation, and behavior as “plain” </cite><code>char</code><cite> (C90
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6.1.2.5, C90 6.2.1.1, C99 and C11 6.2.5, C99 and C11 6.3.1.1).</cite>
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<p><a name="index-fsigned_002dchar-2860"></a><a name="index-funsigned_002dchar-2861"></a>Determined by ABI. The options <samp><span class="option">-funsigned-char</span></samp> and
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<samp><span class="option">-fsigned-char</span></samp> change the default. See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>.
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<li><cite>The mapping of members of the source character set (in character
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constants and string literals) to members of the execution character
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set (C90 6.1.3.4, C99 and C11 6.4.4.4, C90, C99 and C11 5.1.1.2).</cite>
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<p>Determined by ABI.
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<li><cite>The value of an integer character constant containing more than one
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character or containing a character or escape sequence that does not map
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to a single-byte execution character (C90 6.1.3.4, C99 and C11 6.4.4.4).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>.
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<li><cite>The value of a wide character constant containing more than one
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multibyte character or a single multibyte character that maps to
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multiple members of the extended execution character set, or
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containing a multibyte character or escape sequence not represented in
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the extended execution character set (C90 6.1.3.4, C99 and C11
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6.4.4.4).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>.
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<li><cite>The current locale used to convert a wide character constant consisting
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of a single multibyte character that maps to a member of the extended
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execution character set into a corresponding wide character code (C90
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6.1.3.4, C99 and C11 6.4.4.4).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>.
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<li><cite>Whether differently-prefixed wide string literal tokens can be
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concatenated and, if so, the treatment of the resulting multibyte
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character sequence (C11 6.4.5).</cite>
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<p>Such tokens may not be concatenated.
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<li><cite>The current locale used to convert a wide string literal into
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corresponding wide character codes (C90 6.1.4, C99 and C11 6.4.5).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>.
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<li><cite>The value of a string literal containing a multibyte character or escape
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sequence not represented in the execution character set (C90 6.1.4,
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C99 and C11 6.4.5).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>.
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<li><cite>The encoding of any of </cite><code>wchar_t</code><cite>, </cite><code>char16_t</code><cite>, and
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</cite><code>char32_t</code><cite> where the corresponding standard encoding macro
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(</cite><code>__STDC_ISO_10646__</code><cite>, </cite><code>__STDC_UTF_16__</code><cite>, or
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</cite><code>__STDC_UTF_32__</code><cite>) is not defined (C11 6.10.8.2).</cite>
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<p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>. <code>char16_t</code> and
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<code>char32_t</code> literals are always encoded in UTF-16 and UTF-32
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respectively.
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</ul>
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