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In the C Programming Language, the #define directive allows the definition of macros within your source code These macro definitions allow constant values to be declared for use throughout your code Macro definitions are not variables and cannot be changed by your program code like variables You generally use this syntax when creating constantsC keywords This is a list of reserved keywords in C Since they are used by the language, these keywords are not available for redefinition The most common keywords that begin with an underscore are generally used through their convenience macros atomic_bool, atomic_int, Also, each name that begins with a double underscore __ or anIn a computer language, a reserved word (also known as a reserved identifier) is a word that cannot be used as an identifier, such as the name of a variable, function, or label – it is "reserved from use" This is a syntactic definition, and a reserved word may have no meaning A closely related and often conflat...