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What is the purpose of the 'nullptr' keyword in C++?
- a)To indicate that a pointer is uninitialized
- b)To explicitly assign a pointer to NULL
- c)To check if a pointer is pointing to a valid memory location
- d)To convert a pointer to a null-terminated string
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
What is the purpose of the nullptr keyword in C++?a)To indicate that a...
Explanation:
nullptr keyword in C++
- The nullptr keyword was introduced in C++11 to address the ambiguity and confusion caused by using NULL to represent a null pointer.
- nullptr is a keyword that represents a null pointer constant, which can be assigned to any pointer type.
Purpose of nullptr keyword
- To indicate that a pointer is uninitialized: When a pointer is assigned nullptr, it clearly indicates that the pointer is not pointing to any valid memory location. This helps in avoiding errors caused by using uninitialized pointers.
- To avoid confusion with NULL: Using NULL for null pointers can be ambiguous since it is defined as an integer constant with a value of 0. nullptr is a distinct type that can only be assigned to pointers, making the code clearer and safer.
- Type safety: nullptr is a type-safe null pointer constant, which means it can be implicitly converted to any pointer type but cannot be implicitly converted to other integer types like NULL can.
Example:
cpp
int* ptr = nullptr; // pointer initialized to nullptr
if (ptr == nullptr) {
// code block to handle null pointer
}
By using the nullptr keyword in C++, programmers can clearly indicate when a pointer is intended to be null, improving code readability and reducing the risk of errors related to uninitialized pointers.
nullptr keyword in C++
- The nullptr keyword was introduced in C++11 to address the ambiguity and confusion caused by using NULL to represent a null pointer.
- nullptr is a keyword that represents a null pointer constant, which can be assigned to any pointer type.
Purpose of nullptr keyword
- To indicate that a pointer is uninitialized: When a pointer is assigned nullptr, it clearly indicates that the pointer is not pointing to any valid memory location. This helps in avoiding errors caused by using uninitialized pointers.
- To avoid confusion with NULL: Using NULL for null pointers can be ambiguous since it is defined as an integer constant with a value of 0. nullptr is a distinct type that can only be assigned to pointers, making the code clearer and safer.
- Type safety: nullptr is a type-safe null pointer constant, which means it can be implicitly converted to any pointer type but cannot be implicitly converted to other integer types like NULL can.
Example:
cpp
int* ptr = nullptr; // pointer initialized to nullptr
if (ptr == nullptr) {
// code block to handle null pointer
}
By using the nullptr keyword in C++, programmers can clearly indicate when a pointer is intended to be null, improving code readability and reducing the risk of errors related to uninitialized pointers.
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Community Answer
What is the purpose of the nullptr keyword in C++?a)To indicate that a...
The 'nullptr' keyword is used to indicate that a pointer is uninitialized or does not currently point to any valid memory location. It is a replacement for the older 'NULL' macro and provides a more type-safe way to represent null pointers.
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What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer?
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What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer? for EmSAT Achieve 2024 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer?.
What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer? for EmSAT Achieve 2024 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the purpose of the nullptr keyword in C++?a)To indicate that a pointer is uninitializedb)To explicitly assign a pointer to NULLc)To check if a pointer is pointing to a valid memory locationd)To convert a pointer to a null-terminated stringCorrect answer is option 'A'. Can you explain this answer?.
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