Overview

In this tutorial, we will learn about C++ identifiers. A C++ identifier is a name used to identify a variable, class, function, or other user-defined items in the program.

Naming Rules

The rules of the C++ language determine the valid identifiers. There are some rules for valid or qualified identifiers.

The first character of an identifier must be alphabetic[A to Z]  or [a to z] or an underscore( _ ). The first character cannot be a numeric digit i.e [0 to 9].

Note that C++ is a case-sensitive programming language. For example, studentNo and STUDENTNO are two different identifiers in C++.

C++ reserved words cannot be used for identifiers. For example, throw is a reserved word. We cannot have an identifier with this name.

 

Examples

Some valid and legal identifiers are as follows:

• i
• abc
• studentName
• testing_docs
• _temp

Some unqualified identifiers are as follows:

• 9name
• else

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C++ Tutorials

C++ Tutorials on this website:

https://www.testingdocs.com/c-coding-tutorials/

For more information on the current ISO C++ standard

https://isocpp.org/std/the-standard