17 Questions
Which of the following is true about identifiers in C++?
Identifiers must be unique within the program.
What is the correct rule for the first character of an identifier in C++?
It must be a letter or an underscore (_).
Why are keywords not allowed to be used as identifiers in C++?
Keywords are reserved for specific tasks in the language.
What is the significance of identifier uniqueness in C++?
It helps avoid naming conflicts.
Which of the following is NOT allowed in an identifier in C++?
White spaces
Why should identifiers in C++ be chosen with valid and relevant names?
To increase maintainability and readability of programs.
What happens if two identifiers differ only in their case in C++?
'first_name' and 'First_name' are considered different entities.
Which of the following is a reserved keyword in C++?
int
What is the purpose of keywords in C++?
To provide specific meaning and functionalities
Which method can be used to define constants in C++?
'const' keyword
How many keywords are reserved in C++?
95
What does a 'literal' refer to in C++?
A constant value assigned to a constant variable
In C++, which preprocessor directive is used to define constant identifiers?
#define
When using the 'string' keyword in C++, what are we actually defining?
An object representing a sequence of characters
Which special symbol in C++ is used to access class and struct members?
Dot (.)
What is the purpose of the scope resolution operator (::) in C++?
To access members of namespaces, classes, etc.
What does the assignment operator '=' do in C++?
Assign values to variables
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
#definepreprocessor directive is used to define constant identifiers in C++. - The
constkeyword 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++.
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.
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