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C# Programming :: Inheritance

  1. 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.

  2. A.
    1, 2, 3
    B.
    3, 4
    C.
    2, 4, 5
    D.
    3, 5

  3. 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 ***]     
         } 
      }
    

     

  4. A.

    Console.WriteLine(base.i + " " + i);

    B.

    Console.WriteLine(i + " " + base.i);

    C.

    Console.WriteLine(mybase.i + " " + i);

    D.

    Console.WriteLine(i + " " + mybase.i);

    E.

    Console.WriteLine(i + " " + this.i);


  5. Which of the following statements are correct about the C#.NET code snippet given below?

     namespace FresherGateConsoleApplication
     {    
         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.

     

     

  6. A.

    1, 2, 5

    B.

    2, 3, 4

    C.

    3, 5

    D.

    4, 5

    E.

    None of these


  7. What will be the size of the object created by the following C#.NET code snippet?

     namespace FresherGateConsoleApplication
     {   
        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();  
          }  
       
         }  
      }
    

  8. A.

    24 bytes

    B.

    12 bytes

    C.

    20 bytes

    D.

    10 bytes

    E.

    16 bytes


  9. Which statement will you add in the function fun() of class B, if it is to produce the output "Welcome to FresherGate.com!"?

       namespace FresherGateConsoleApplication
       {  
          class A  
          {      
              public void fun()  
              {           
                 Console.Write("Welcome");     
              }      
          }    
          class B: A     
          {      
              public void fun()      
              {          
                  // [*** Add statement here ***]             
                  Console.WriteLine(" to FresherGate.com!");           
               } 
           }  
           class MyProgram 
           {      
               static void Main (string[ ] args)     
               {            
                  B b = new B();        
                  b.fun();       
               }  
            } 
         }
    

     

  10. A.

    base.fun();

    B.

    A::fun();

    C.

    fun();

    D.

    mybase.fun();

    E.

    A.fun();


  11. What will be the output of the C#.NET code snippet given below?

     namespace FresherGateConsoleApplication
     {   
       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();    
              }    
         }  
     }
    

     

  12. A.

    Base class

    B.

    Derived1 class

    C.

    Derived2 class

    D.

    Base class Derived1 class

    E.

    Base class Derived1 class Derived2 class


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

  14. A.
    Polymorphism
    B.
    Templates
    C.
    Containership
    D.
    Encapsulation
    E.
    Inheritance

  15. Which of the following is correct about the C#.NET snippet given below?

     namespace FresherGateConsoleApplication
     {   
        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);  
               }    
           } 
        }
    

  16. A.

    The program gives the output as: Hi Hello Bye

    B.

    The program gives the output as: Bye Hello

    C.

    The program gives the output as: Hi Bye Hello

    D.

    Error in the program


  17. 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

  18. A.
    1, 3
    B.
    2, 5
    C.
    3, 4
    D.
    4, 5

  19. Which of the following are reuse mechanisms available in C#.NET?

    1. Inheritance
    2. Encapsulation
    3. Templates
    4. Containership
    5. Polymorphism

  20. A.
    1, 4
    B.
    1, 3
    C.
    2, 4
    D.
    3, 5