Class 7 Exam > Class 7 Questions > Why references are different from pointers?a)...
Start Learning for Free
Why references are different from pointers?
- a)A reference cannot be made null
- b)A reference cannot be changed once initialized
- c)No extra operator is needed for dereferencing of a reference
- d)All of the mentioned
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
Why references are different from pointers?a)A reference cannot be mad...
References and Pointers:
References and pointers are both used in C++ to indirectly access and manipulate variables. However, there are some key differences between them.
A) A reference cannot be made null:
- A reference in C++ must always be initialized with a valid object.
- It cannot be left uninitialized or set to null.
- This ensures that a reference always refers to a valid object, eliminating the possibility of a null reference error.
B) A reference cannot be changed once initialized:
- Once a reference is initialized with an object, it cannot be changed to refer to a different object.
- It remains bound to the same object throughout its lifetime.
- This provides a level of safety, as it prevents accidental reassignment and ensures that the reference consistently refers to the same object.
C) No extra operator is needed for dereferencing of a reference:
- In C++, accessing the value of a reference does not require an extra operator like the * operator used with pointers.
- The reference itself can be treated as if it were the object it refers to.
- This simplifies the syntax and makes code more readable.
Summary:
In summary, references and pointers serve similar purposes in C++, but there are some important distinctions between them. References cannot be null, they cannot be changed once initialized, and they do not require an extra operator for dereferencing. These characteristics make references safer and more convenient to use in certain situations. However, pointers still have their own advantages, such as the ability to be null and to be reassigned to different objects. Therefore, the choice between references and pointers depends on the specific requirements of the program and the desired behavior.
References and pointers are both used in C++ to indirectly access and manipulate variables. However, there are some key differences between them.
A) A reference cannot be made null:
- A reference in C++ must always be initialized with a valid object.
- It cannot be left uninitialized or set to null.
- This ensures that a reference always refers to a valid object, eliminating the possibility of a null reference error.
B) A reference cannot be changed once initialized:
- Once a reference is initialized with an object, it cannot be changed to refer to a different object.
- It remains bound to the same object throughout its lifetime.
- This provides a level of safety, as it prevents accidental reassignment and ensures that the reference consistently refers to the same object.
C) No extra operator is needed for dereferencing of a reference:
- In C++, accessing the value of a reference does not require an extra operator like the * operator used with pointers.
- The reference itself can be treated as if it were the object it refers to.
- This simplifies the syntax and makes code more readable.
Summary:
In summary, references and pointers serve similar purposes in C++, but there are some important distinctions between them. References cannot be null, they cannot be changed once initialized, and they do not require an extra operator for dereferencing. These characteristics make references safer and more convenient to use in certain situations. However, pointers still have their own advantages, such as the ability to be null and to be reassigned to different objects. Therefore, the choice between references and pointers depends on the specific requirements of the program and the desired behavior.
Free Test
FREE
| Start Free Test |
Community Answer
Why references are different from pointers?a)A reference cannot be mad...
References cannot be made null whereas a pointer can be. References cannot be changed whereas pointers can be modified.
Pointers need * operator to dereference the value present inside it whereas reference does not need an operator for dereferencing.
Pointers need * operator to dereference the value present inside it whereas reference does not need an operator for dereferencing.
Attention Class 7 Students!
To make sure you are not studying endlessly, EduRev has designed Class 7 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 7.
|
Explore Courses for Class 7 exam
|
|
Similar Class 7 Doubts
Top Courses for Class 7View all
Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer?
Question Description
Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer?.
Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 7.
Download more important topics, notes, lectures and mock test series for Class 7 Exam by signing up for free.
Here you can find the meaning of Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Why references are different from pointers?a)A reference cannot be made nullb)A reference cannot be changed once initializedc)No extra operator is needed for dereferencing of a referenced)All of the mentionedCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Class 7 tests.
|
|
Explore Courses for Class 7 exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup