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Enumerations - General Questions

  1. Which of the following statements are correct about enum used in C#.NET?

    1. Every enum is derived from an Object class.
    2. Every enum is a value type.
    3. There does not exist a way to print an element of an enum as a string.
    4. Every enum is a reference type.
    5. The default underlying datatype of an enum is int.

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

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

     enum color : byte
 {   
   red = 500,  
   green = 1000,    
   blue = 1500 
}

    3. A.

    byte values cannot be assigned to enum elements.
    B.

    enum elements should always take successive values.
    C.

    Since 500, 1000, 1500 exceed the valid range of byte compiler will report an error.
    D.

    enum must always be of int type.
    E.

    enum elements should be declared as private.

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

     namespace FresherGateConsoleApplication
 (
   class Sample 
   {
      private enum color : int   
      {       
         red,      
         green,      
         blue   
      }  
      public void fun()  
      {      
         Console.WriteLine(color.red);    
      } 
    }
    class Program 
    {    
       static void Main(string[ ] args)  
       {   
           // Use enum color here    
       }
   } 
  }
    1. To define a variable of type enum color in Main(), we should use the statement, color c; .
    2. enum color being private it cannot be used in Main().
    3. We must declare enum color as public to be able to use it outside the class Sample.
    4. To define a variable of type enum color in Main(), we should use the statement, Sample.color c; .
    5. We must declare private enum color outside the class to be able to use it in Main().

     

     

    4. A.

    1, 2, 3
    B.

    2, 3, 4
    C.

    3, 4
    D.

    4, 5

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

    5. A.
    enum is a reference type.
    B.
    enum is a value type.
    C.
    Whether it a value type or a reference type depends upon size.
    D.
    Whether it a value type or a reference type depends upon a Project Setting made in Visual Stiiclio.NET.
    E.
    We can programmatically control whether it is a value type or a reference type.

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

    1. An enum can be declared inside a class.
    2. An enum can take Single, Double or Decimal values.
    3. An enum can be declared outside a class.
    4. An enum can be declared inside/outside a namespace.
    5. An object can be assigned to an enum variable.

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

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