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Identifiers

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  1. Used for function and variable names.

  2. Composed of letters and digits.

  3. Underscore (_) is treated as a character

  4. 31 characters is maximum length (this can vary with compiler.)

  5. Valid names: foo, foo1234, foo_1234, _foo

  6. Invalid names: 12foo, foo@df, foo#

  7. CASE IS SIGNIFICANT: foo is not the same as FOO