This is a list of reserved keywords in C. Since they are used by the language, these keywords are not available for re-definition. As an exception, they are not considered reserved in attribute-tokens.(since C23)
The most common keywords that begin with an underscore are generally used through their convenience macros:
Some keywords are deprecated and retained as alternative spellings for compatibility purposes. These can be used wherever the keyword can.
Keyword Alternative spellingalignas (C23) _Alignas (C11)(deprecated in C23) alignof (C23) _Alignof (C11)(deprecated in C23) bool (C23) _Bool (C99)(deprecated in C23) static_assert (C23) _Static_assert (C11)(deprecated in C23) thread_local (C23) _Thread_local (C11)(deprecated in C23)
It is unspecified whether any of the spellings of these keywords, their alternate forms, or true and false is implemented as a predefined macro.
Each name that begins with a double underscore __ or an underscore _ followed by an uppercase letter is reserved: see identifier for details.
Note that digraphs <%, %>, <:, :>, %:, and %:%: provide an alternative way to represent standard tokens.
The following tokens are recognized by the preprocessor when they are used within the context of a preprocessor directive:
The following tokens are recognized by the preprocessor when they are used outside the context of a preprocessor directive:
The following additional keywords are classified as extensions and conditionally-supported:
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