References problems
- 1. Which of the following statements is correct?
- We can return a global variable by reference.
- We cannot return a local variable by reference.
Options- A. Only 1 is correct.
- B. Only 2 is correct.
- C. Both 1 and 2 are correct.
- D. Both 1 and 2 are incorrect. Discuss
Correct Answer: Only 2 is correct.
- 2. Which of the following statements is correct?
- Once the variable and the reference are linked they are tied together.
- Once the reference of a variable is declared another reference of that variable is not allowed.
Options- A. Only 1 is correct.
- B. Only 2 is correct.
- C. Both 1 and 2 are correct.
- D. Both 1 and 2 are incorrect. Discuss
Correct Answer: Only 1 is correct.
- 3. Reference is like a _____.
Options- A. Pointer
- B. Structure
- C. Macro
- D. Enum Discuss
Correct Answer: Pointer
- 4. Which of the following statement is correct about the references?
Options- A. A reference must always be initialized within functions.
- B. A reference must always be initialized outside all functions.
- C. A reference must always be initialized.
- D. Both A and C. Discuss
Correct Answer: A reference must always be initialized.
- 5. Which of the following statement is correct?
Options- A. A referenced has to be de-referenced to access a value.
- B. A referenced does not need to be de-referenced to access a value.
- C. A referenced has to be double de-referenced to access a value.
- D. Whether a reference should be de-referenced or not depends on the type of the reference. Discuss
Correct Answer: A referenced does not need to be de-referenced to access a value.
- 6. Functions can be declared to return a reference type. There are reasons to make such a declaration/Which of the following reasons are correct?
- The information being returned is a large enough object that returning a reference is more efficient than returning a copy.
- The type of the function must be a R-value.
Options- A. Only 1 is correct.
- B. Only 2 is correct.
- C. Both 1 and 2 are correct.
- D. Both 1 and 2 are incorrect. Discuss
Correct Answer: Both 1 and 2 are correct.
- 7. Which of the following statement is correct?
Options- A. Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.
- B. A reference is indicated by using && operator.
- C. Once a reference variable has been defined to refer to a particular variable it cannot refer to any other variable.
- D. A reference can be declared beforehand and initialized later. Discuss
Correct Answer: Once a reference variable has been defined to refer to a particular variable it cannot refer to any other variable.
- 8. Which of the following statements is correct?
- An array of references is acceptable.
- We can also create a reference to a reference.
Options- A. Only 1 is correct.
- B. Only 2 is correct.
- C. Both 1 and 2 are correct.
- D. Both 1 and 2 are incorrect. Discuss
Correct Answer: Both 1 and 2 are incorrect.
- 9. Which of the following statement is correct?
Options- A. A reference is declared using * operator.
- B. Once a reference variable has been defined to refer to a particular variable it can refer to any other variable.
- C. A reference must always be initialized within classes.
- D. A variable can have multiple references. Discuss
Correct Answer: A variable can have multiple references.
- 10. Which of the following statement is correct?
Options- A. A reference is stored on heap.
- B. A reference is stored on stack.
- C. A reference is stored in a queue.
- D. A reference is stored in a binary tree. Discuss
Correct Answer: A reference is stored on stack.
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