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An identifier starts with one of [_, a-z, A-Z] and may continue with one or more of [_, a-z, A-Z, 0-9]. There are often length limitations as well as limitations involving leading underscores, [_], and identifiers may not exactly match any reserved word.

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12y ago
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8y ago

No. Identifiers must begin with a letter or underscore, and must only contains letters, digits and underscores.

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Q: What are the various rules for writing an identifier name in C language?
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