Polymorphism problems
- 1. Which of the following statements is correct?
Options- A. Only one object can be created from an abstract class.
- B. By default methods are virtual.
- C. If a derived class does not provide its own version of virtual method then the one in the base class is used.
- D. If the method in the derived class is not preceded by override keywords, the compiler will issue a warning and the method will behave as if the override keyword were present.
- E. Each derived class does not have its own version of a virtual method. Discuss
Correct Answer: If a derived class does not provide its own version of virtual method then the one in the base class is used.
- 2. Which of the following statements is correct?
Options- A. The conditional logical operators cannot be overloaded.
- B. When a binary operator is overloaded the corresponding assignment operator, if any, must be explicitly overloaded.
- C. We can use the default equality operator in an overloaded implementation of the equality operator.
- D. A public or nested public reference type does not overload the equality operator.
- E. The array indexing operator can be overloaded. Discuss
Correct Answer: The conditional logical operators cannot be overloaded.
- 3. Which of the followings is the correct way to overload + operator?
Options- A.
public sample operator + ( sample a, sample b ) - B.
public abstract operator + ( sample a, sample b) - C.
public abstract sample operator + (sample a, sample b ) - D.
public static sample operator + ( sample a, sample b ) - E. All of the above Discuss
Correct Answer:
public static sample operator + ( sample a, sample b )- 4. Which of the following keyword is used to overload user-defined types by defining static member functions?
Options- A. op
- B. opoverload
- C. operator
- D. operatoroverload
- E. udoperator Discuss
Correct Answer: operator
- 5. Which of the following are necessary for Run-time Polymorphism?
- The overridden base method must be virtual, abstract or override.
- Both the override method and the virtual method must have the same access level modifier.
- An override declaration can change the accessibility of the virtual method.
- An abstract inherited property cannot be overridden in a derived class.
- An abstract method is implicitly a virtual method.
Options- A. 1, 3
- B. 1, 2, 5
- C. 2, 3, 4
- D. 4 only Discuss
Correct Answer: 1, 2, 5
- 6. Which of the following can be declared as a virtual in a class?
- Methods
- Properties
- Events
- Fields
- Static fields
Options- A. 1, 2, 3
- B. 3, 5
- C. 2, 4
- D. 2, 3, 5 Discuss
Correct Answer: 1, 2, 3
More in C# Programming:
Programming
Copyright ©CuriousTab. All rights reserved.