Identifiers: Identifier is the name of the element which is used to identify class, method, and variable in a program. Example declaration of variable identifier: data_type identifier-name; Here, “data_type” is to mention the type of the identifier. “identifier-name” is the name of the identifier. Rules of defining identifiers: To declare an identifier, the programmer should follow the below rules: An identifier can use sequence of characters like digit, letters, underscores (_), and dollar signs ($). The identifier must not be a predefined word. The identifier cannot be “true”, “false”, or “null”. An identifier cannot start with digit. It can start with letter, underscore (_), or dollar sign ($). It can any of length and cannot use special characters. Keywords: Keyword is the reserved word by a program. Because, it has special meaning such as abstract, new, private, etc.

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Chapter 2.4, Problem 2.4.1CP

Program Plan Intro

Identifiers:

Identifier is the name of the element which is used to identify class, method, and variable in a program.

Example declaration of variable identifier:

data_type identifier-name;

Here,

“data_type” is to mention the type of the identifier.

“identifier-name” is the name of the identifier.

Rules of defining identifiers:

To declare an identifier, the programmer should follow the below rules:

An identifier can use sequence of characters like digit, letters, underscores (_), and dollar signs ($).

The identifier must not be a predefined word.

The identifier cannot be “true”, “false”, or “null”.

An identifier cannot start with digit. It can start with letter, underscore (_), or dollar sign ($).

It can any of length and cannot use special characters.

Keywords:

Keyword is the reserved word by a program. Because, it has special meaning such as abstract, new, private, etc.

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