Tag: programming languages

Questions Related to programming languages

Which statement is true about interface and abstract classes?
technology programming languages

  1. a. An abstract class may only contain incomplete methods (abstract methods)

  2. b. An interface may contain complete or incomplete methods

  3. c. A class may inherit several interfaces, A class may inherit only one abstract class

  4. d. A class implementing an abstract class has to implement all the methods of the abstract class, but the same is not required in the case of an interface

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Correct Option: C

If a method is marked as protected internal who can access it?
technology programming languages

  1. a. Access is limited to the current assembly

  2. b. Access is limited to the containing class or types derived from the containing class.

  3. c. Access is limited to the containing type

  4. d. Access is limited to the current assembly or types derived from the containing class.

Show answer
Correct Option: D
Explanation:

To understand who can access a method marked as protected internal, the user needs to know about access modifiers in C#.

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

A. Access is limited to the current assembly: This option is partially correct. When a method is marked as internal, it can only be accessed within the same assembly. However, when a method is marked as protected internal, it can be accessed by derived types from any assembly as well as within the same assembly. Therefore, option A is incorrect.

B. Access is limited to the containing class or types derived from the containing class: This option is incorrect. When a method is marked as protected, it can be accessed by the containing class or types derived from the containing class. However, when a method is marked as protected internal, it can be accessed by derived types from any assembly as well as within the same assembly. Therefore, option B is incorrect.

C. Access is limited to the containing type: This option is incorrect. protected internal access modifier provides more accessibility than protected access modifier. When a method is marked as protected, it can be accessed by the containing class or types derived from the containing class. However, when a method is marked as protected internal, it can be accessed by derived types from any assembly as well as within the same assembly. Therefore, option C is incorrect.

D. Access is limited to the current assembly or types derived from the containing class: This option is correct. When a method is marked as protected internal, it can be accessed by derived types from any assembly as well as within the same assembly. Therefore, option D is the correct answer.

The Answer is: D

The default type of enum is integer and has a default value 1.
technology programming languages

  1. a. true

  2. b. false

  3. c. sometimes

  4. d. depends

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Correct Option: B

Unboxing of a null refrence type will return null.
technology programming languages

  1. a. true

  2. b. false

  3. c. an exception is thrown

  4. d. depends

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Correct Option: C

can we have protected element as a namespace member? eg namespace mine { protected class test { } }
technology programming languages

  1. a. yes,all access specifiers are valid for namespace members

  2. b. No,only private access specifiers are possible

  3. c. No,implicitly all members are protected

  4. d. No,the namespace allows only public and internal elements as its members

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Correct Option: D

Can multiple catch blocks be executed for single try block?
technology programming languages

  1. a. Yes

  2. b. No

  3. c. Under certain conditions

  4. d. May be

Show answer
Correct Option: B

Difference between const and readonly
technology programming languages

  1. a. readonly value can be changed later

  2. b. const items are dealt at compile time however readonly is dealt at runtime

  3. c. const value can be changed later

  4. d. const items are dealt at runtime however readonly is dealt at compile time

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Correct Option: B

A variable declared inside a method is called

technology programming languages

  1. a. local variable

  2. b. global variable

  3. c. static variable

  4. d. private variable

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Correct Option: A

In programming languages, which language's version name is also known as "Scorpio" ?

technology programming languages

  1. JAVA

  2. C

  3. ColdFusion

  4. HTML 5

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Correct Option: C

Which of the following declaration will compile without errors?
a) 

public abstract class Digit {
    public abstract void print();
}

b)

public class Digit {
    public abstract void print();
}

c)

public abstract class Digit {
    public abstract void print(){};
}

d)

public abstract class Digit {
    public void print();
}

e)

public class Digit {
    public void print(){};
}
technology programming languages

  1. a, b

  2. b, c

  3. a, d

  4. a, e

Show answer
Correct Option: D
Explanation:

To solve this question, the user needs to know about abstract classes and abstract methods in Java.

An abstract class is a class that cannot be instantiated on its own and is often used as a template for other classes. Abstract methods are methods that are declared but have no implementation in the abstract class.

Option a declares an abstract class Digit with an abstract method print(). This is a valid declaration of an abstract class.

Option b declares a class Digit with an abstract method print(). This is not a valid declaration because a non-abstract class cannot have an abstract method.

Option c declares an abstract class Digit with an abstract method print() that has an empty implementation. This is not valid because an abstract method cannot have an implementation in the abstract class.

Option d declares an abstract class Digit with a non-abstract method print(). This is not valid because an abstract class must have at least one abstract method.

Option e declares a non-abstract class Digit with a non-abstract method print(). This is a valid declaration of a non-abstract class.

Therefore, the correct answer is:

The Answer is: D