In C language the ANSI Chas 32 keywords that may not be used as variable or function names. These words, combined with the formal C syntax, form the C programming language. They are listed in this table.
Many C compilers have added several additional keywords that are used to take better advantage of the environment in which the compiler is used, and that give support for inter-language programming, interrupts, and memory organization. Some commonly used extended keywords are show in the table.
The lowercase lettering of the keywords in significant. C requires that all keywords be in lowercase form. For example RETURN will not be recognized as the keyword return. Also, no keyword may be used as a variable or function name.
(post by arnob)
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