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Structures (C# Programming) Question and Answers-Page first

Structures problems


  • 1. Which of the following statements are correct?

    1. A struct can contain properties.
    2. A struct can contain constructors.
    3. A struct can contain protected data members.
    4. A struct cannot contain methods.
    5. A struct cannot contain constants.

  • Options
  • A. 1, 2
  • B. 3, 4
  • C. 1, 2, 4
  • D. 3, 5
  • Discuss
  • 2. Which of the following are true about classes and struct?

    1. A class is a reference type, whereas a struct is a value type.
    2. Objects are created using new, whereas structure variables can be created either using new or without using new.
    3. A structure variable will always be created slower than an object.
    4. A structure variable will die when it goes out of scope.
    5. An object will die when it goes out of scope.

  • Options
  • A. 1, 2, 4
  • B. 3, 5
  • C. 2, 4
  • D. 3, 4, 5
  • Discuss
  • 3. Creating empty structures is allowed in C#.NET.

  • Options
  • A. True
  • B. False
  • Discuss
  • 4. Which of the following is the correct way of setting values into the structure variable e defined below?

    struct Emp
    {
        public String name;
        public int age;
        public Single sal; 
    }
    Emp e = new Emp();

  • Options
  • A.
    e.name = "Amol"; 
    e.age = 25; 
    e.sal = 5500;
  • B.
    With e
    {
        .name = "Amol";
        .age = 25;
        .sal = 5500; 
    }
  • C.
    With emp e
    {
        .name = "Amol";
        .age = 25;
        .sal = 5500; 
    }
  • D.
    e -> name = "Amol"; 
    e -> age = 25;
    e -> sal = 5500;
  • E.
    name = "Amol"; 
    age = 25;
    sal = 5500;
  • Discuss
  • 5. Which of the following statements are correct about the structure declaration given below?

    struct Book
    {
        private String name; 
        protected int totalpages; 
        public Single price; 
        public void Showdata()
        {
            Console.WriteLine(name + " " + totalpages + " " + price);
        } 
        Book()
        {
            name = " "; 
            totalpages = 0;
            price = 0.0f; 
        } 
    } 
    Book b = new Book();
    1. We cannot declare the access modifier of totalpages as protected.
    2. We cannot declare the access modifier of name as private.
    3. We cannot define a zero-argument constructor inside a structure.
    4. We cannot declare the access modifier of price as public.
    5. We can define a Showdata() method inside a structure.

  • Options
  • A. 1, 2
  • B. 1, 3, 5
  • C. 2, 4
  • D. 3, 4, 5
  • Discuss
  • 6. How many bytes will the structure variable samp occupy in memory if it is defined as shown below?

    class Trial
    { 
        int i; 
        Decimal d;
    }
    struct Sample
    {
        private int x; 
        private Single y; 
        private Trial z;
    }
    Sample samp = new Sample();

  • Options
  • A. 20 bytes
  • B. 12 bytes
  • C. 8 bytes
  • D. 16 bytes
  • E. 24 bytes
  • Discuss
  • 7. When would a structure variable get destroyed?

  • Options
  • A. When no reference refers to it, it will get garbage collected.
  • B. Depends upon whether it is created using new or without using new.
  • C. When it goes out of scope.
  • D. Depends upon the Project Settings made in Visual Studio.NET.
  • E. Depends upon whether we free it's memory using free() or delete().
  • Discuss
  • 8. Which of the following will be the correct output for the C#.NET program given below?

    namespace CuriousTabConsoleApplication
    { 
        struct Sample
        {
            public int i;
        }
        class MyProgram
        { 
            static void Main()
            {
                Sample x = new Sample(); 
                x.i = 10; 
                fun(x); 
                Console.Write(x.i + " ");
            }
            static void fun(Sample y)
            {
                y.i = 20; 
                Console.Write(y.i + " ");
            } 
        } 
    }

  • Options
  • A. 10 20
  • B. 10 10
  • C. 20 10
  • D. 20 20
  • E. None of the above
  • Discuss
  • 9. Which of the following will be the correct output for the program given below?

    namespace CuriousTabConsoleApplication
    { 
        struct Sample
        {
            public int i;
        }
        class MyProgram
        { 
            static void Main(string[] args)
            {
                Sample x = new Sample();
                Sample y;
                x.i = 9;
                y = x;
                y.i = 5;
                Console.WriteLine(x.i + " " + y.i); 
            } 
        } 
    }

  • Options
  • A. 9 9
  • B. 9 5
  • C. 5 5
  • D. 5 9
  • E. None of the above
  • Discuss
  • 10. Which of the following statements is correct?

  • Options
  • A. A struct never declares a default constructor.
  • B. All value types in C# inherently derive from ValueType, which inherits from Object.
  • C. A struct never declares a default destructor.
  • D. In C#, classes and structs are semantically same.
  • Discuss

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