identify a valid identifier
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A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores. The first letter of an identifier should be either a letter or an underscore. You cannot use keywords like int , while etc. as identifiers. There is no rule on how long an identifier can be.
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A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores. The first letter of an identifier should be either a letter or an underscore. You cannot use keywords like int , while etc. as identifiers. There is no rule on how long an identifier can be.
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