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C# Programming :: Classes and Objects

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

     class Student s1, s2; // Here 'Student' is a user-defined class.
     s1 = new Student();  
     s2 = new Student():
    

  2. A.

    Contents of s1 and s2 will be exactly same.

    B.

    The two objects will get created on the stack.

    C.

    Contents of the two objects created will be exactly same.

    D.

    The two objects will always be created in adjacent memory locations.

    E.

    We should use delete() to delete the two objects from memory.


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

    class Sample 
    {   
       private int i;   
       public Single j;    
       private void DisplayData()   
       {
          Console.WriteLine(i + " " + j); 
       } 
       public void ShowData() 
       {      
          Console.WriteLine(i + " " + j);  
       }   
    }
    

  4. A.

    j cannot be declared as public.

    B.

    DisplayData() cannot be declared as private.

    C.

    DisplayData() cannot access j.

    D.

    ShowData() cannot access to i.

    E.

    There is no error in this class.


  5. Which of the following statements are correct?

    1. Instance members of a class can be accessed only through an object of that class.
    2. A class can contain only instance data and instance member function.
    3. All objects created from a class will occupy equal number of bytes in memory.
    4. A class can contain Friend functions.
    5. A class is a blueprint or a template according to which objects are created.

  6. A.
    1, 3, 5
    B.
    2, 4
    C.
    3, 5
    D.
    2, 4, 5
    E.
    None of these

  7. Which of the following statements is correct?

  8. A.
    Procedural Programming paradigm is different than structured programming paradigm.
    B.
    Object Oriented Programming paradigm stresses on dividing the logic into smaller parts and writing procedures for each part.
    C.
    Classes and objects are corner stones of structured programming paradigm.
    D.
    Object Oriented Programming paradigm gives equal importance to data and the procedures that work on the data.
    E.
    C#.NET is a structured programming language.

  9. Which of the following is the correct way to create an object of the class Sample?

    1. Sample s = new Sample();
    2. Sample s;
    3. Sample s; s = new Sample();
    4. s = new Sample();

  10. A.
    1, 3
    B.
    2, 4
    C.
    1, 2, 3
    D.
    1, 4
    E.
    None of these

  11. Which of the following will be the correct output for the C#.NET program given below?

     namespace FreshergateConsoleApplication
     {    
        class Sample   
        {        
           int i;      
           Single j;        
           public void SetData(int i, Single j)          
           {          
              i = i;     
              j = j;     
           }    
           public void Display()     
           {           
              Console.WriteLine(i + " " + j);      
           }     
        }      
        class MyProgram    
        {         
           static void Main(string[ ] args)      
           {             
              Sample s1 = new Sample();             
              s1.Se1tData(10, 5.4f);              
              s1.Display();      
           } 
        } 
     }
    

  12. A.

    0 0

    B.

    10 5.4

    C.

    10 5.400000

    D.

    10 5

    E.

    None of the above


  13. The this reference gets created when a member function (non-shared) of a class is called.

  14. A.
    True
    B.
    False

  15. Which of the following statements are correct?

    1. Data members ofa class are by default public.
    2. Data members of a class are by default private.
    3. Member functions of a class are by default public.
    4. A private function of a class can access a public function within the same class.
    5. Member function of a class are by default private.

  16. A.
    1, 3, 5
    B.
    1, 4
    C.
    2, 4, 5
    D.
    1, 2, 3
    E.
    None of these

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

    namespace FreshergateConsoleApplication 
    {    
        class Sample   
        {     
           public int index;    
           public int[] arr = new int[10];                   
    
           public void fun(int i, int val)  
           {           
              arr[i] = val;   
           }   
        }       
      
        class MyProgram  
        {     
           static void Main(string[] args)    
           {       
                Sample s = new Sample();              
                s.index = 20;      
                Sample.fun(1, 5);      
                s.fun(1, 5);    
            }  
         } 
      }

     

  18. A.

    s.index = 20 will report an error since index is public.

    B.

    The call s.fun(1, 5) will work correctly.

    C.

    Sample.fun(1, 5) will set a value 5 in arr[ 1 ].

    D.

    The call Sample.fun(1, 5) cannot work since fun() is not a shared function.

    E.

    arr being a data member, we cannot declare it as public.


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

     sample c;
     c = new sample();
    1. It will create an object called sample.
    2. It will create a nameless object of the type sample.
    3. It will create an object of the type sample on the stack.
    4. It will create a reference c on the stack and an object of the type sample on the heap.
    5. It will create an object of the type sample either on the heap or on the stack depending on the size of the object.

  20. A.

    1, 3

    B.

    2, 4

    C.

    3, 5

    D.

    4, 5

    E.

    None of these