Identifiers
A C++ identifier must start with either a letter or the underscore symbol, and the remaining characters must all be letters, digits, or the underscore symbol. C++ identifiers are case sensitive and have no limit to their length. There is a special class of identifiers, called keywords or reserved words, which have a predefined meaning in C++ and cannot be used as names for variables or anything else.
The following keywords should not be used for anything other than their predefined purposes in
the C++ language.
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| C++ Reserved Keywords |
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