C - Identifiers

an Identifier is a name of an entitiy to identify uniquely during the program execution. for example, variable name, array name, function name, structure name, etc.,

Rules for writing an identifier:

• Allowed charecters to write an identifier
  • Upper case letters
  • Lower case letters
  • Digits
  • Only underscore from special charecters
• Identifier should not start with digit. it can starts with either alphabets or underscore( _ )
• keywords can not be used as an identifier
• there is no length limit for an identifiler. however, recommanded to give 31 characters. because, the compiler considers the first 31 characters only
• identifiers are case sensitive.In identifiers, both uppercase and lowercase letters are distinct.

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