5.1 Identifier format

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      Identifiers in C-- must begin with an underscore '_' or uppercase or

  lowercase letters. The following characters may be any combination of

  underscore, uppercase or lowercase letters, or numbers (0 to 9). An

  identifier may be no more than 64 characters long. Characters above 0x7A

  ('z') are not permitted.

 

  Examples of valid identifiers:

 

  _DOG

  Loony12

  HowdYBoys_AND_Girls

  WOW___

  X

 

  Examples of invalid identifiers:

 

  12bogus /* can not begin with a number */

  WowisthisalongidentifieryupitsureisnotOyoulengthismorethat64chars

   /* identifier longer than 64 characters */

  Y_es sir /* space not permitted */

  The-end /* hyphen not permitted */