is one of the principles of object-oriented programming that allows the defining of a child class that reuses or inherits the behavior of a parent class (or existing class).

Inheritance

The inheriting class is called a _______

derived class

The existing class whose members are being inherited is called a ______

base class

Which syntax is correct where the class Student inherit from class "Person"?

public class Student : Person { }

Members of a superclass are declared _______ if you want its subclasses to access its members.

protected

In C#, the ____ keyword is used to specify which constructor from the base class should invoke when creating instances of the derived class.

base

Which of the following syntax is correct when a derived class Student inherits the constructor of it's base class Person

public Student(string name, int age, long id, string program) : base(name, age) { this.student_id = id; this.student_program = program; }

A derived class inherits the methods of its base class. Declaring a method in a derived class with the same name as the method from its base class is called _____________.

method overriding

In C#, the overridden method from the base class should be declared as _____.

virtual

When overriding a virtual method from the base class, the _______ modifier is required to modify the abstract or virtual implementation of the inherited method and must have the same method signature as the overridden method (virtual method).

override

An __________ is a base class that cannot be instantiated to create an object.

abstract class

Which syntax properly creates an abstract class of BankAccount?

public abstract class BankAccount { }

Which syntax properly creates a abstract method named deposit

public abstract void deposit(double amount);

____________ which means “multiple forms,” is one of the fundamental concepts of object-oriented programming.

Polymorphism

Also known as “static polymorphism,” this polymorphism is implemented using method overloading.

Compile time polymorphism

This polymorphism is a process in which the compiler determines which method to call during runtime

Runtime polymorphism

An _______ only contains the signatures of methods, properties, and events as its members. It is the responsibility of the class implementing the interface to provide the implementation of the members.

interface

Which syntax properly creates a interface ITransactions

public interface ITransactions { }

An interface cannot contain instance variables or fields but may contain __________.

properties

Which syntax correctly creates properties for an interface IPerson, and set them accordingly.

public interface IPerson { string first_name { get; set; } string last_name { get; set; } int age { get; set; } void setInfo(string FName, string LName, int year_old); }

What is the output of the following program when compiled and executed? using System; public abstract class Message { public abstract void printMessage(); public void printSomething() { Console.Write("Good morning!"); } } public class LocalMessage : Message { public override void printMessage() { Console.Write("Hello!"); } public static void Main(string[] args) { LocalMessage lm1 = new LocalMessage(); lm1.printMessage(); } }

Hello!

What is the output of the following program when compiled and executed? using System; public class Number { protected int a = 0; } public class LocalNumber : Number { public void math() { Console.Write(this.a++); } public static void Main(string[] args) { LocalNumber ln1 = new LocalNumber(); ln1.math(); ln1.math(); } }

Consider the following program: public class Number { private int number; public virtual void setNumber(int number) { this.number = number; } } public class LocalNumber : Number{ public override void setNumber(int number) { number = number + 5; base.setNumber(number); } } Which method is overridden?

setNumber method from Number class

What is the value of the variable number when the following program is compiled and executed? using System; public abstract class Number { public abstract int getNumber(int x); } public class LocalNumber : Number { private int x = 5; public override int getNumber(int x) { return this.x+=x; } public static void Main(string[] args) { LocalNumber ln1 = new LocalNumber(); int number = ln1.getNumber(5); } }