Identifiers are names given to elements in a program like variables, functions etc. The rules for identifiers are: · Identifiers can include both, characters and digits. However, the identifier cannot begin with a digit. · Identifiers cannot include special symbols except for underscore (_) or a dollar sign ($) . · Identifiers cannot be keywords. · They must be unique. · Identifiers are case-sensitive · Identifiers cannot contain spaces.
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