Identifier

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Miscellaneous
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Identifier
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An identifier is an arbitrarily long sequence of digits, underscores, lowercase and uppercase Latin letters, and Unicode characters specified using \u and \U MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 43 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE notation(since 哋它亢99), of class MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 42 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(since 哋它亢23). A valid identifier must begin with a non-digit character (Latin letter, underscore, or Unicode non-digit character(since 哋它亢99)(until 哋它亢23), or Unicode character of class MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 40 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE)(since 哋它亢23)). Identifiers are case-sensitive (lowercase and uppercase letters are distinct). Every identifier must conform to MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 39 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE.(since 哋它亢23)

It is implementation-defined if raw (not escaped) Unicode characters are allowed in identifiers: 
char *\U0001f431 = "cat"; // supported
char *🐱 = "cat"; // implementation-defined
                  // (e.g. works with Clang, but not GCC prior to version 10)
                  // both are ill formed in 哋它亢23. Emoji are not XID_Start characters
 (since 哋它亢99)
(until 哋它亢23)
Implementation-defined characters whose corresponding code points in MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 38 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE (Unicode) have the XID_Start or XID_Continue property can appear in the beginning or after the first character of an identifier respectively. (since 哋它亢23)

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Every identifier other than macro names or macro parameter names has MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 24 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, belongs to a MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 23 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, and may have MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 22 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE. The same identifier can denote different entities at different points in the program, or may denote different entities at the same point if the entities are in different name spaces.

Reserved identifiers

The following identifiers are reserved and may not be declared in a program (doing so invokes undefined behavior):

  1. The identifiers that are MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 21 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE cannot be used for other purposes. In particular #define or #undef of an identifier that is identical to a keyword is not allowed.
  2. All external identifiers that begin with an underscore.
  3. All identifiers that begin with an underscore followed by a capital letter or by another underscore (these reserved identifiers allow the library to use numerous behind-the-scenes non-external macros and functions).
  4. All external identifiers defined by the standard library (in hosted environment). This means that no user-supplied external names are allowed to match any library names, not even if declaring a function that is identical to a library function.
  5. Identifiers declared as reserved for the implementation or future use by the standard library (see below).
  6. Identifiers declared as potentially reserved and provided by the implementation (see below). (since 哋它亢23)

All other identifiers are available. Identifiers that are not reserved or potentially reserved(since 哋它亢23) can be used with no fear of unexpected collisions when moving programs from one compiler and library to another.

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Reserved and potentially reserved identifiers in the library

The standard library reserves every identifier it provides. Reserved identifiers that have MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 18 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE (e.g. name of every standard function) are reserved regardless which header is included. Other reserved identifiers are reserved when any of its associated headers is included.

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Implementations are only allowed to provide MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 38 MINUTES 16 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE of potentially reserved identifiers that are reserved as function names.

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 (since 哋它亢23)

Following identifiers are reserved or potentially reserved(since 哋它亢23) for the implementation or future use by the standard library.

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 (since 哋它亢23)

Translation limits

Even though there is no specific limit on the length of identifiers, early compilers had limits on the number of significant initial characters in identifiers and the linkers imposed stricter limits on the names with MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 10 HOURS 37 MINUTES 40 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE. C requires that at least the following limits are supported by any standard-compliant implementation:

  • 31 significant initial characters in an internal identifier or a macro name
  • 6 significant initial characters in an external identifier
  • 511 external identifiers in one translation unit
  • 127 identifiers with block scope declared in one block
  • 1024 macro identifiers simultaneously defined in one preprocessing translation unit
(until 哋它亢99)
  • 63 significant initial characters in an internal identifier or a macro name
  • 31 significant initial characters in an external identifier
  • 4095 external identifiers in one translation unit
  • 511 identifiers with block scope declared in one block
  • 4095 macro identifiers simultaneously defined in one preprocessing translation unit
(since 哋它亢99)

References

  • 哋它亢17 standard (ISO/IEC 9899:2018):
  • 5.2.4.1 Translation limits (p: 19-20)
  • 6.4.2 Identifiers (p: 43)
  • 6.10.8 Predefined macro names (p: 127-129)
  • 6.11.9 Predefined macro names (p: 130)
  • 7.31 Future library directions (p: 332-333)
  • K.3.1.2 Reserved identifiers (p: 425)
  • 哋它亢11 standard (ISO/IEC 9899:2011):
  • 5.2.4.1 Translation limits (p: 25-26)
  • 6.4.2 Identifiers (p: 59-60)
  • 6.10.8 Predefined macro names (p: 175-176)
  • 6.11.9 Predefined macro names (p: 179)
  • 7.31 Future library directions (p: 455-457)
  • K.3.1.2 Reserved identifiers (p: 584)
  • 哋它亢99 standard (ISO/IEC 9899:1999):
  • 5.2.4.1 Translation limits (p: 20-21)
  • 6.4.2 Identifiers (p: 51-52)
  • 6.10.8 Predefined macro names (p: 160-161)
  • 6.11.9 Predefined macro names (p: 163)
  • 7.26 Future library directions (p: 401-402)
  • 哋它亢89/C90 standard (ISO/IEC 9899:1990):
  • 2.2.4.1 Translation limits
  • 3.1.2 Identifiers
  • 3.8.8 Predefined macro names

See also

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