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C# Programming :: Enumerations

  1. Which of the following statements are correct about an enum used inC#.NET?

    1. By default the first enumerator has the value equal to the number of elements present in the list.
    2. The value of each successive enumerator is decreased by 1.
    3. An enumerator contains white space in its name.
    4. A variable cannot be assigned to an enum element.
    5. Values of enum elements cannot be populated from a database.

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

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

     int a = 10; 
     int b = 20; 
     int c = 30; 
     enum color: byte 
     {  
        red = a,   
        green = b,
        blue = c 
     }
    

     

  4. A.

    Variables cannot be assigned to enum elements.

    B.

    Variables can be assigned to any one of the enum elements.

    C.

    Variables can be assigned only to the first enum element.

    D.

    Values assigned to enum elements must always be successive values.

    E.

    Values assigned to enum elements must always begin with 0.


  5. Which of the following statements is true about an enum used in C#.NET?

  6. A.
    An implicit cast is needed to convert from enum type to an integral type.
    B.
    An enum variable cannot have a public access modifier.
    C.
    An enum variable cannot have a private access modifier.
    D.
    An enum variable can be defined inside a class or a namespace.
    E.
    An enum variable cannot have a protected access modifier.

  7. Which of the following statements are correct about an enum used inC#.NET?

    1. To use the keyword enum, we should either use [enum] or System.Enum.
    2. enum is a keyword.
    3. Enum is class declared in System.Type namespace.
    4. Enum is a class declared in the current project's root namespace.
    5. Enum is a class declared in System namespace.

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

  9. Which of the following will be the correct output for the C#.NET code snippet given below?

      enum color : int
      {  
           red = -3,  
           green, 
           blue  
      }
       Console.Write( (int) color.red + ", ");    
       Console.Write( (int) color.green + ", ");  
       Console.Write( (int) color.blue );
    

  10. A.

    -3, -2, -1

    B.

    -3, 0, 1

    C.

    0, 1, 2

    D.

    red, green, blue

    E.

    color.red, color.green, color.blue


  11. An enum that is declared inside a class, struct, namespace or interface is treated as public.

  12. A.
    True
    B.
    False

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

     enum per
     {   
        married,   
        unmarried,   
        divorced,   
        spinster 
      }
      per.married = 10;   
      Console.WriteLine(per.unmarried);
    

  14. A.

    The program will output a value 11.

    B.

    The program will output a value 1.

    C.

    The program will output a value 2.

    D.

    The program will report an error since an enum element cannot be assigned a value outside the enum declaration.

    E.

    The enum elements must be declared private.


  15. Which of the following is the correct output for the C#.NET code snippet given below?

    enum color: int 
    {   
        red,  
        green,  
        blue = 5,  
        cyan,  
        magenta = 10,   
        yellow 
     }
     Console.Write( (int) color.green + ", " );     
     Console.Write( (int) color.yellow );

     

  16. A.

    2, 11

    B.

    1, 11

    C.

    2, 6

    D.

    1, 5

    E.

    None of the above


  17. An enum can be declared inside a class, struct, namespace or interface.

  18. A.
    True
    B.
    False

  19. Which of the following CANNOT be used as an underlying datatype for an enum in C#.NET?

  20. A.
    byte
    B.
    short
    C.
    float
    D.
    int