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    <p>C99, TC3 reads:</p> <p>6.4.4.4 §2:</p> <blockquote> <p>An integer character constant is a sequence of <strong>one or more</strong> multibyte characters enclosed in single-quotes, as in 'x'. [...]</p> </blockquote> <p>6.4.4.4 §10:</p> <blockquote> <p>An integer character constant has type int. The value of an integer character constant containing a single character that maps to a single-byte execution character is the numerical value of the representation of the mapped character interpreted as an integer. The value of an integer character constant containing more than one character (e.g., 'ab'), or containing a character or escape sequence that does not map to a single-byte execution character, is implementation-defined. If an integer character constant contains a single character or escape sequence, its value is the one that results when an object with type char whose value is that of the single character or escape sequence is converted to type int.</p> </blockquote> <p>In most implementations, it's safe to use integer character constants of up to 4 one-byte characters. The actual value might differ between different systems (endianness?) though.</p> <hr> <p>This is actually already defined in the ANSI-C89 standard, section 3.1.3.4:</p> <blockquote> <p>An integer character constant is a sequence of one or more multibyte characters enclosed in single-quotes, as in 'x' or 'ab'. [...]</p> <p>An integer character constant has type int. The value of an integer character constant containing a single character that maps into a member of the basic execution character set is the numerical value of the representation of the mapped character interpreted as an integer. The value of an integer character constant containing more than one character, or containing a character or escape sequence not represented in the basic execution character set, is implementation-defined. In particular, in an implementation in which type char has the same range of values as signed char, the high-order bit position of a single-character integer character constant is treated as a sign bit.</p> </blockquote>
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    1. POWhat is the type of an enum whose values appear to be strings?
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    1. COGood - something official. :)
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      1. USSteve Fallows
    2. COThis was a common, but non-portable, non-standard extension before c99, too.
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      1. USdmckee
    3. CO@dmckee: multi-byte character constants were already part of ANSI-C89 (see section 3.1.3.4), so it has always been standard!
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