Variables and Identifiers

Variable: Variables are containers for storing data values. They are reserved memory locations that stores values.

Identifier: Identifier is a name used to identify a variable, function, class, module or other object. An identifier starts with a letter A to Z or a to z or an underscore (_) followed by zero or more letters, underscores and digits (0 to 9).

The rule of an identifier: 

  • The first character of an identifier must be an underscore(‘_’) or a letter (upper or lowercase).

  • The rest of the identifier name can be underscore(‘_’), letter(upper or lower case) or digits(0-9).

  • Identifier name are case-sensitive.

  • Punctuation characters such as @, $, % are not allowed within identifier.

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