Tag: c-sharp

Questions Related to c-sharp

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

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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

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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

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

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Correct Option: C

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

  1. Try

  2. Catch

  3. Exception

  4. Event

  5. System

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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

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Correct Option: E

A____block enclose the code that could throw an exception.

.net c-sharp

  1. Try

  2. Catch

  3. Exception

  4. Error

  5. a and b

Show answer
Correct Option: A