Word Symbols are also called reserved words, or keywords. It is always makes up of lowercase letter only. Furthermore, it cannot be redefined within any program; that is, they cannot be used for anything other than their intended use.
C++’s identifiers are names of things that appear in C++, such as variable constants, and functions. Some are predefined, some are defined by user. It can be made of only letters, digits, and the underscore character. Moreover, it must begin with a letter or underscore.
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