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- <a name="Characters-implementation"></a>
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- Next: <a href="Integers-implementation.html#Integers-implementation" accesskey="n" rel="next">Integers implementation</a>, Previous: <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="p" rel="prev">Identifiers implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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- <a name="Characters"></a>
- <h3 class="section">4.4 Characters</h3>
-
- <ul>
- <li> <cite>The number of bits in a byte (C90 3.4, C99 and C11 3.6).</cite>
-
- <p>Determined by ABI.
- </p>
- </li><li> <cite>The values of the members of the execution character set (C90,
- C99 and C11 5.2.1).</cite>
-
- <p>Determined by ABI.
- </p>
- </li><li> <cite>The unique value of the member of the execution character set produced
- for each of the standard alphabetic escape sequences (C90, C99 and C11
- 5.2.2).</cite>
-
- <p>Determined by ABI.
- </p>
- </li><li> <cite>The value of a <code>char</code> object into which has been stored any
- character other than a member of the basic execution character set
- (C90 6.1.2.5, C99 and C11 6.2.5).</cite>
-
- <p>Determined by ABI.
- </p>
- </li><li> <cite>Which of <code>signed char</code> or <code>unsigned char</code> has the same
- range, representation, and behavior as “plain” <code>char</code> (C90
- 6.1.2.5, C90 6.2.1.1, C99 and C11 6.2.5, C99 and C11 6.3.1.1).</cite>
-
- <a name="index-fsigned_002dchar-1"></a>
- <a name="index-funsigned_002dchar-1"></a>
- <p>Determined by ABI. The options <samp>-funsigned-char</samp> and
- <samp>-fsigned-char</samp> change the default. See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>.
- </p>
- </li><li> <cite>The mapping of members of the source character set (in character
- constants and string literals) to members of the execution character
- set (C90 6.1.3.4, C99 and C11 6.4.4.4, C90, C99 and C11 5.1.1.2).</cite>
-
- <p>Determined by ABI.
- </p>
- </li><li> <cite>The value of an integer character constant containing more than one
- character or containing a character or escape sequence that does not map
- to a single-byte execution character (C90 6.1.3.4, C99 and C11 6.4.4.4).</cite>
-
- <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
- behavior</a> in <cite>The C Preprocessor</cite>.
- </p>
- </li><li> <cite>The value of a wide character constant containing more than one
- multibyte character or a single multibyte character that maps to
- multiple members of the extended execution character set, or
- containing a multibyte character or escape sequence not represented in
- the extended execution character set (C90 6.1.3.4, C99 and C11
- 6.4.4.4).</cite>
-
- <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
- behavior</a> in <cite>The C Preprocessor</cite>.
- </p>
- </li><li> <cite>The current locale used to convert a wide character constant consisting
- of a single multibyte character that maps to a member of the extended
- execution character set into a corresponding wide character code (C90
- 6.1.3.4, C99 and C11 6.4.4.4).</cite>
-
- <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
- behavior</a> in <cite>The C Preprocessor</cite>.
- </p>
- </li><li> <cite>Whether differently-prefixed wide string literal tokens can be
- concatenated and, if so, the treatment of the resulting multibyte
- character sequence (C11 6.4.5).</cite>
-
- <p>Such tokens may not be concatenated.
- </p>
- </li><li> <cite>The current locale used to convert a wide string literal into
- corresponding wide character codes (C90 6.1.4, C99 and C11 6.4.5).</cite>
-
- <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
- behavior</a> in <cite>The C Preprocessor</cite>.
- </p>
- </li><li> <cite>The value of a string literal containing a multibyte character or escape
- sequence not represented in the execution character set (C90 6.1.4,
- C99 and C11 6.4.5).</cite>
-
- <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
- behavior</a> in <cite>The C Preprocessor</cite>.
- </p>
- </li><li> <cite>The encoding of any of <code>wchar_t</code>, <code>char16_t</code>, and
- <code>char32_t</code> where the corresponding standard encoding macro
- (<code>__STDC_ISO_10646__</code>, <code>__STDC_UTF_16__</code>, or
- <code>__STDC_UTF_32__</code>) is not defined (C11 6.10.8.2).</cite>
-
- <p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
- behavior</a> in <cite>The C Preprocessor</cite>. <code>char16_t</code> and
- <code>char32_t</code> literals are always encoded in UTF-16 and UTF-32
- respectively.
- </p>
- </li></ul>
-
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- Next: <a href="Integers-implementation.html#Integers-implementation" accesskey="n" rel="next">Integers implementation</a>, Previous: <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="p" rel="prev">Identifiers implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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