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- Question
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
- Correct Answer
public static sample operator + ( sample a, sample b )
- 1. 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
- 2. 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
- 3. Which of the following statements is correct?
Options- A. When used as a modifier, the new keyword explicitly hides a member inherited from a base class.
- B. Operator overloading works in different ways for structures and classes.
- C. It is not necessary that all operator overloads are static methods of the class.
- D. The cast operator can be overloaded. Discuss
- 4. Which of the following keyword is used to change the data and behavior of a base class by replacing a member of a base class with a new derived member?
Options- A. new
- B. base
- C. overloads
- D. override
- E. overridable Discuss
- 5. Which of the following statement is correct about the C#.NET code snippet given below?
public class Sample { public int x; public virtual void fun() { } } public class DerivedSample : Sample { new public void fun() { } }
Options- A. DerivedSample class hides the fun() method of base class.
- B. The DerivedSample class version of fun() method gets called using Sample class reference which holds DerivedSample class object.
- C. The code replaces the DerivedSample class version of fun() method with its Sample class version.
- D. It is not possible to hide Sample class version of fun() method without use of new in DerivedSample class. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Which of the following statements are correct about a HashTable collection?
- It is a keyed collection.
- It is a ordered collection.
- It is an indexed collection.
- It implements a IDictionaryEnumerator interface in its inner class.
- The key - value pairs present in a HashTable can be accessed using the Keys and Values properties of the inner class that implements the IDictionaryEnumerator interface.
Options- A. 1 and 2 only
- B. 1, 2 and 3 only
- C. 4 and 5 only
- D. 1, 4 and 5 only
- E. All of the above Discuss
- 10. Which of the following statements are correct about the C#.NET code snippet given below?
Stack st = new Stack(); st.Push("hello"); st.Push(8.2); st.Push(5); st.Push('b'); st.Push(true);
Options- A. Dissimilar elements like "hello", 8.2, 5 cannot be stored in the same Stack collection.
- B. Boolean values can never be stored in Stack collection.
- C. In the fourth call to Push(), we should write "b" in place of 'b'.
- D. To store dissimilar elements in a Stack collection, a method PushAnyType() should be used in place of Push().
- E. This is a perfectly workable code. Discuss
Polymorphism problems
Search Results
Correct Answer: The conditional logical operators cannot be overloaded.
Correct Answer: If a derived class does not provide its own version of virtual method then the one in the base class is used.
Correct Answer: When used as a modifier, the new keyword explicitly hides a member inherited from a base class.
Correct Answer: new
Correct Answer: DerivedSample class hides the fun() method of base class.
Correct Answer: operator
Correct Answer: 1, 2, 5
Correct Answer: 1, 2, 3
Correct Answer: 1, 4 and 5 only
Correct Answer: This is a perfectly workable code.
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