C reserved words are words which cannot be used as names. This includes all the built-in type names, including int, char and double and their aliases, the modifiers long, short, signed and unsigned, and all language keywords such as if, else, for, while, return and so on.
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Reserve words, also known as keywords are words whose meaning are already defined by a compiler. C language has a total of 32 reserve words. Short, union, else, for, goto, unsigned, enum, extern, char, continue, switch, struct, typedef are some examples.
No. Keywords are reserved and cannot be used as identifiers. However, C/C++ is case-sensitive. So although register is a reserved keyword, Register is not.
You may use it as an identifier, because it is not a reserved word in C.
Keywords or reserved words.
Some languages have specific terms, however keyword or reserved word is the general terminology we use when referring to a programming language's primary vocabulary. That is; words that cannot be used as identifiers. However, some languages also have contextual keywords. For instance, C++ has final and override contextual keywords. These can be used as both identifiers and keywords, depending on the context. The only reason for this is that people were using these words as identifiers before they were introduced to the language (in C++11) and making them actual keywords would have broken a lot of older code.