Tag: .net

Questions Related to .net

Polymorphism occurs when the methods of the child class.
.net c-sharp

  1. Override the parent class methods but maintain the implementation

  2. Maintain the same return type and arguments as the parent class, but implement it differently

  3. Have different return types and arguments than the parent class

  4. Are Virtual

Show answer
Correct Option: B

To output the value of multidimensional array, Console.WriteLines(___)

.net c-sharp

  1. myArray[1][3];

  2. myArray[1,3];

  3. myArray{1}{3};

  4. myArray(1),(3);

Show answer
Correct Option: B
Explanation:

To output the value of a multidimensional array, you need to provide the indices for each dimension of the array. Let's go through each option and determine if it correctly outputs the value of a multidimensional array:

A. myArray[1][3]; This option is incorrect because it uses the wrong syntax to access the value of a multidimensional array. In C#, the correct syntax to access a value in a multidimensional array is myArray[1,3], not myArray[1][3]. The correct syntax uses commas to separate the indices for each dimension.

B. myArray[1,3]; This option is correct. It uses the correct syntax to access the value of a multidimensional array. The comma is used to separate the indices for each dimension, and this syntax correctly outputs the value at index 1 in the first dimension and index 3 in the second dimension of the array.

C. myArray{1}{3}; This option is incorrect because it uses curly braces instead of square brackets to access the value of the multidimensional array. In C#, square brackets [] are used to access array elements, not curly braces {}.

D. myArray(1),(3); This option is incorrect because it uses parentheses instead of square brackets to access the value of the multidimensional array. In C#, square brackets [] are used to access array elements, not parentheses ().

Therefore, the correct option is B. myArray[1,3].

All methods in an abstract base class must be declared abstract.
.net c-sharp

  1. True

  2. False

Show answer
Correct Option: B

Methods that are declared abstract in the base class must show implementation at the time of declaration.

.net c-sharp

  1. True

  2. False

Show answer
Correct Option: B

The code public class B : A { }

.net c-sharp

  1. Defines a class that inherits all the methods of A

  2. Defines a class that inherits the public and protected methods of A only

  3. Errors

  4. a and b

Show answer
Correct Option: B

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Defines a class that inherits all the methods of A - This option is incorrect because it states that class B inherits all the methods of A. However, without any additional information, we cannot determine if class B indeed inherits all the methods of class A.

Option B) Defines a class that inherits the public and protected methods of A only - This option is correct. In C#, when a class is derived from another class (using the colon syntax), it inherits the public and protected members of the base class. In this case, class B inherits the public and protected methods of class A.

Option C) Errors - This option is incorrect because there is no apparent error in the given code. It is a valid class definition.

Option D) a and b - This option is incorrect because only option B is correct. Option A is incorrect because it assumes that class B inherits all the methods of class A, which is not necessarily true.

The correct answer is B) Defines a class that inherits the public and protected methods of A only. This option is correct because when a class is derived from another class in C#, it inherits the public and protected members of the base class.

Assuming that public class B : A { public B(int i) :base(i) { } } compiles and runs correctly, what can we conclude about the constructors in the class A?

.net c-sharp

  1. One constructor takes an argument of type i

  2. There is only a default constructor

  3. One constructor takes an arguments of the type int

  4. a and b

Show answer
Correct Option: C

AI Explanation

To answer this question, let's analyze the given code:

public class B : A {
    public B(int i) : base(i) {
    }
}

This code snippet shows the class B inheriting from class A. The constructor in class B takes an argument of type int and calls the base constructor of class A with the same argument.

Based on this information, we can conclude that:

A. One constructor takes an argument of type i - This option is incorrect because the argument in the constructor of class B is named i, not i itself.

B. There is only a default constructor - This option is incorrect because the presence of the B(int i) constructor in class B indicates that there is a non-default constructor in class A.

C. One constructor takes an argument of the type int - This option is correct because the B(int i) constructor in class B calls the base constructor A(int i), indicating that there is a constructor in class A that takes an argument of type int.

D. a and b - This option is incorrect because option A is incorrect. Only option C is correct.

Therefore, the correct answer is option C.

Classes declared with the sealed keyword cannot be base class.
.net c-sharp

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

To solve this question, the user must understand the concept of the sealed keyword in object-oriented programming languages.

Explanation:

The sealed keyword is used to restrict inheritance in object-oriented programming. When a class is declared with the sealed keyword, it means that no other class can inherit from it. In other words, a sealed class cannot be used as a base class for another class.

Now, let's go through each option and explain why it is right or wrong:

A. True: This option is correct. When a class is declared with the sealed keyword, it cannot be used as a base class. Other classes cannot inherit from a sealed class.

B. False: This option is incorrect. Classes declared with the sealed keyword cannot be used as a base class, so the statement is true.

The Answer is: A

A method_____an exception when that method detects that a problem has occured.
.net c-sharp

  1. Trys

  2. Catches

  3. Throws

  4. a and b

Show answer
Correct Option: C

Exception objects are derived from the class.
.net c-sharp

  1. Try

  2. Catch

  3. Exception

  4. Event

  5. System

Show answer
Correct Option: C

An abstract class

.net c-sharp

  1. may contain instance variables

  2. may contain constructors

  3. may extend another class

  4. a and b

  5. all of the above

Show answer
Correct Option: E