Identifiers in C++

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Questions and Answers

Which of the following is true about identifiers in C++?

Special characters can be used in identifiers.

Identifiers must be unique within the program. (correct)

Keywords can be used as identifiers.

Identifiers must begin with a number.

What is the correct rule for the first character of an identifier in C++?

It can be any special character.

It can be a number.

It can only be an underscore (_).

It must be a letter or an underscore (_). (correct)

Why are keywords not allowed to be used as identifiers in C++?

Keywords cannot be printed as identifiers.

Keywords are difficult to remember for identifiers.

Keywords are reserved for specific tasks in the language. (correct)

Keywords are too long to be identifiers.

What is the significance of identifier uniqueness in C++?

It helps avoid naming conflicts. Signup and view all the answers

Which of the following is NOT allowed in an identifier in C++?

White spaces Signup and view all the answers

Why should identifiers in C++ be chosen with valid and relevant names?

To increase maintainability and readability of programs. Signup and view all the answers

What happens if two identifiers differ only in their case in C++?

'first_name' and 'First_name' are considered different entities. Signup and view all the answers

Which of the following is a reserved keyword in C++?

int Signup and view all the answers

What is the purpose of keywords in C++?

To provide specific meaning and functionalities Signup and view all the answers

Which method can be used to define constants in C++?

'const' keyword Signup and view all the answers

How many keywords are reserved in C++?

95 Signup and view all the answers

What does a 'literal' refer to in C++?

A constant value assigned to a constant variable Signup and view all the answers

In C++, which preprocessor directive is used to define constant identifiers?

#define Signup and view all the answers

When using the 'string' keyword in C++, what are we actually defining?

An object representing a sequence of characters Signup and view all the answers

Which special symbol in C++ is used to access class and struct members?

Dot (.) Signup and view all the answers

What is the purpose of the scope resolution operator (::) in C++?

To access members of namespaces, classes, etc. Signup and view all the answers

What does the assignment operator '=' do in C++?

Assign values to variables Signup and view all the answers

Study Notes

Identifiers in C++

The first character of an identifier in C++ can be a letter (A-Z or a-z), an underscore (_), or a universal character.
Keywords are not allowed to be used as identifiers in C++ because they are reserved words with specific meanings.
Identifier uniqueness is significant in C++ because it allows the compiler to differentiate between variables, functions, and other entities.

Rules for Identifiers in C++

Identifiers cannot start with a digit (0-9) in C++.
Identifiers cannot contain special characters except underscores (_).
Identifiers are case-sensitive, meaning that uppercase and lowercase letters are treated as distinct.

Keywords in C++

Keywords are reserved words with specific meanings in C++.
The purpose of keywords in C++ is to provide a set of predefined words that have a specific meaning in the language.

Defining Constants in C++

The #define preprocessor directive is used to define constant identifiers in C++.
The const keyword is also used to define constants in C++.

Literals in C++

A literal in C++ refers to a constant value that is directly represented in the code, such as numbers, characters, or strings.

Accessing Class and Struct Members in C++

The dot operator (.) is used to access class and struct members in C++.
The arrow operator (->) is used to access class and struct members through a pointer.

Scope Resolution Operator in C++

The scope resolution operator (::) is used to specify the scope of a identifier, such as a namespace or class.

Assignment Operator in C++

The assignment operator (=) is used to assign a value to a variable in C++.

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Description

Learn about identifiers in C++. Identify the rules and importance of using unique names for variables, functions, classes, and more within a program. Understand why keywords cannot be used as identifiers.