CSharp Programming

CSharp Programming

Inheritance has 28 Questions

Which of the following can be facilitated by the Inheritance mechanism?
  1. Use the existing functionality of base class.
  2. Overrride the existing functionality of base class.
  3. Implement new functionality in the derived class.
  4. Implement polymorphic behaviour.
  5. Implement containership.

1, 2, 3
3, 4
2, 4, 5
3, 5
Multiple inheritance is different from multiple levels of inheritance.

True
False
Which of the following statements should be added to the subroutine fun( ) if the C#.NET code snippet given below is to output 9 13?
class BaseClass
{
    protected int i = 13;
}
class Derived: BaseClass
{
    int i = 9; 
    public void fun()
    {
        // [*** Add statement here ***]
    } 
}

Console.WriteLine(base.i + " " + i);
Console.WriteLine(i + " " + base.i);
Console.WriteLine(mybase.i + " " + i);
Console.WriteLine(i + " " + mybase.i);
An object of a derived class cannot access private members of base class.

True
False
Which of the following statements are correct about the C#.NET code snippet given below?
namespace ASTIWZConsoleApplication
{ 
    class index
    {
        protected int count;
        public index()
        {
            count = 0;
        }
    }
    class index1: index
    {
        public void increment()
        {
            count = count +1;
        }
    }
    class MyProgram
    {
        static void Main(string[] args)
        {
            index1 i = new index1(); 
            i.increment(); 
        }
    }
}
  1. count should be declared as public if it is to become available in the inheritance chain.
  2. count should be declared as protected if it is to become available in the inheritance chain.
  3. While constructing an object referred to by i firstly constructor of index class will be called followed by constructor of index1 class.
  4. Constructor of index class does not get inherited in index1 class.
  5. count should be declared as Friend if it is to become available in the inheritance chain.

1, 2, 5
2, 3, 4
3, 5
4, 5
The way a derived class member function can access base class public members, the base class member functions can access public member functions of derived class.

True
False
What will be the size of the object created by the following C#.NET code snippet?
namespace ASTIWZConsoleApplication
{ 
    class Baseclass
    {
        private int i; 
        protected int j; 
        public int k;
    }
    class Derived: Baseclass
    {
        private int x; 
        protected int y; 
        public int z;
    }
    class MyProgram
    { 
        static void Main (string[ ] args)
        { 
            Derived d = new Derived();
        } 
    } 
}

24 bytes
12 bytes
20 bytes
10 bytes
There is no private or protected inheritance in C#.NET.

True
False
Which statement will you add in the function fun() of class B, if it is to produce the output "Welcome to ASTIWZ.com!"?
namespace ASTIWZConsoleApplication
{ 
    class A
    {
        public void fun()
        {
            Console.Write("Welcome");
        } 
    } 
    class B: A
    {
        public void fun()
        {
            // [*** Add statement here ***]
            Console.WriteLine(" to ASTIWZ.com!");
        } 
    } 
    class MyProgram
    { 
        static void Main (string[ ] args)
        { 
            B b = new B(); 
            b.fun();
        } 
    } 
}

base.fun();
A::fun();
fun();
mybase.fun();
We can derive a class from a base class even if the base class's source code is not available.

True
False
What will be the output of the C#.NET code snippet given below?
namespace ASTIWZConsoleApplication
{ 
    class Baseclass
    { 
        public void fun()
        { 
            Console.Write("Base class" + " ");
        } 
    } 
    class Derived1: Baseclass
    { 
        new void fun()
        {
            Console.Write("Derived1 class" + " "); 
        } 
    } 
    class Derived2: Derived1
    { 
        new void fun()
        { 
            Console.Write("Derived2 class" + " ");
        }
    }
    class Program
    { 
        public static void Main(string[ ] args)
        { 
            Derived2 d = new Derived2(); 
            d.fun(); 
        } 
    } 
}

Base class
Derived1 class
Derived2 class
Base class Derived1 class
If a base class contains a member function func(), and a derived class does not contain a function with this name, an object of the derived class cannot access func().

True
False
Which of the following should be used to implement a 'Has a' relationship between two entities?

Polymorphism
Templates
Containership
Encapsulation
If a base class and a derived class each include a member function with the same name, the member function of the derived class will be called by an object of the derived class

True
False
Which of the following is correct about the C#.NET snippet given below?
namespace ASTIWZConsoleApplication
{ 
    class Baseclass
    { 
        public void fun()
        { 
            Console.WriteLine("Hi" + " ");
        } 
        public void fun(int i)
        {
            Console.Write("Hello" + " ");
        } 
    } 
    class Derived: Baseclass
    {
        public void fun()
        {
            Console.Write("Bye" + " ");
        } 
    } 
    class MyProgram
    { 
        static void Main(string[ ] args)
        { 
            Derived d; 
            d = new Derived(); 
            d.fun(); 
            d.fun(77);
        } 
    } 
}

The program gives the output as: Hi Hello Bye
The program gives the output as: Bye Hello
The program gives the output as: Hi Bye Hello
Error in the program
The size of a derived class object is equal to the sum of sizes of data members in base class and the derived class.

True
False
In an inheritance chain which of the following members of base class are accessible to the derived class members?
  1. static
  2. protected
  3. private
  4. shared
  5. public

1, 3
2, 5
3, 4
4, 5
Private members of base class cannot be accessed by derived class member functions or objects of derived class.

True
False
Which of the following are reuse mechanisms available in C#.NET?
  1. Inheritance
  2. Encapsulation
  3. Templates
  4. Containership
  5. Polymorphism

1, 4
1, 3
2, 4
3, 5
A class D can be derived from a class C, which is derived from a class B, which is derived from a class A.

True
False
Which of the following should be used to implement a 'Like a' or a 'Kind of' relationship between two entities?

Polymorphism
Containership
Templates
Inheritance
There is no multiple inheritance in C#.NET. That is, a class cannot be derived from multiple base classes.

True
False
Which of the following is the correct way to create an object of the class Sample?

Declare the existing class as shadows.
Declare the existing class as overloads.
Declare the existing class as sealed.
Declare the existing class as suppress.
Creating a derived class from a base class requires fundamental changes to the base class.

True
False
Which of the following statements are correct about Inheritance in C#.NET?
  1. A derived class object contains all the base class data.
  2. Inheritance cannot suppress the base class functionality.
  3. A derived class may not be able to access all the base class data.
  4. Inheritance cannot extend the base class functionality.
  5. In inheritance chain construction of object happens from base towards derived.

1, 2, 4
2, 4, 5
1, 3, 5
2, 4
It is illegal to make objects of one class as members of another class.

True
False
Assume class B is inherited from class A. Which of the following statements is correct about construction of an object of class B?

While creating the object firstly the constructor of class B will be called followed by constructor of class A.
While creating the object firstly the constructor of class A will be called followed by constructor of class B.
The constructor of only class B will be called.
The constructor of only class A will be called.
Which of the following statements is correct about the C#.NET program given below?
namespace ASTIWZConsoleApplication
{
    class Baseclass
    { 
        int i;
        public Baseclass(int ii)
        {
            i = ii;
            Console.Write("Base "); 
        } 
    } 
    class Derived : Baseclass
    {
        public Derived(int ii) : base(ii)
        {
            Console.Write("Derived ");
        } 
    } 
    class MyProgram
    { 
        static void Main(string[ ] args)
        { 
            Derived d = new Derived(10);
        } 
    } 
}

The program will work correctly only if we implement zero-argument constructors in Baseclass as well as Derived class.
The program will output: Derived Base
The program will report an error in the statement base(ii).
The program will output: Base Derived