Which of the following statements are correct about Structures used in C#.NET? A

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Which of the following statements are correct about Structures used in C#.NET?
1. A Structure can be declared within a procedure.
2. Structs can implement an interface but they cannot inherit from another struct.
3. struct members cannot be declared as protected.
4. A Structure can be empty.
5. It is an error to initialize an instance field in a struct.
Options
A. 1, 2, 4
B. 2, 3, 5
C. 2, 4
D. 1, 3

Correct Answer

2, 3, 5

Structures problems

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

struct Book
{
    private String name; 
    private int noofpages; 
    private Single price;
}
Book b = new Book();

Options
A. The structure variable b will be created on the heap.
B. We can add a zero-argument constructor to the above structure.
C. When the program terminates, variable b will get garbage collected.
D. The structure variable b will be created on the stack.
E. We can inherit a new structure from struct Book.

Discuss

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

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

Options
A. ss will be created on the heap.
B. Trial object referred by z will be created on the stack.
C. z will be created on the heap.
D. Both ss and z will be created on the heap.
E. ss will be created on the stack.

Discuss

4. 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(string[] args)
        {
            Sample x = new Sample(); 
            x.i = 10; 
            fun(ref x); 
            Console.Write(x.i + " ");
        }
        public static void fun(ref Sample y)
        { 
            y.i = 20;
            Console.Write(y.i + " "); 
        } 
    } 
}

Discuss

5. Which of the following is the correct way to define a variable of the type struct Emp declared below?
```
struct Emp
{
    private String name; 
    private int age; 
    private Single sal;
}
```
1. Emp e(); e = new Emp();
2. Emp e = new Emp;
3. Emp e; e = new Emp;
4. Emp e = new Emp();
5. Emp e;
Options
A. 1, 3
B. 2, 5
C. 4, 5
D. 1, 2, 4

Discuss

6. Which of the following will be the correct result of the statement b = a in the C#.NET code snippet given below?

struct Address
{
    private int plotno;
    private String city; 
}
Address a = new Address(); 
Address b; 
b = a;

Options
A. All elements of a will get copied into corresponding elements of b.
B. Address stored in a will get copied into b.
C. Once assignment is over a will get garbage collected.
D. Once assignment is over a will go out of scope, hence will die.
E. Address of the first element of a will get copied into b.

Discuss

7. Which of the following is the correct way to implement a read only property Length in a Sample class?
Options

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
    } 
}

class Sample
{
    public int Length
    {
        get
        {
            return Length;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
        set
        {
            len = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        Readonly get
        {
            return len;
        } 
    } 
}

Discuss

Correct Answer:

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        } 
    } 
}

8. Which of the following is the correct way to implement a write only property Length in a Sample class?
Options

class Sample
{
    public int Length
    {
        set
        {
            Length = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        get
        {
            return len;
        }
        set
        {
            len = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        WriteOnly set
        {
            len = value;
        } 
    } 
}

class Sample
{
    int len;
    public int Length
    {
        set
        {
            len = value;
        }
    } 
}

Discuss

Correct Answer:

class Sample
{
    int len;
    public int Length
    {
        set
        {
            len = value;
        }
    } 
}

9. If a Student class has an indexed property which is used to store or retrieve values to/from an array of 5 integers, then which of the following are the correct ways to use this indexed property?
1. ```
Student[3] = 34;
```
2. ```
Student s = new Student(); 
s[3] = 34;
```
3. ```
Student s = new Student(); 
Console.WriteLine(s[3]);
```
4. ```
Console.WriteLine(Student[3]);
```
5. ```
Student.this s = new Student.this(); 
s[3] = 34;
```
Options
A. 1, 2
B. 2, 3
C. 3, 4
D. 3, 5

Discuss

10. If Sample class has a Length property with set accessor then which of the following statements will work correctly?
Options

Sample m = new Sample(); 
int l;
l = m.Length;

Sample m = new Sample(); 
m.Length = m.Length + 20;

C.
```
Sample.Length = 20;
```
D.
```
Console.WriteLine (Sample.Length);
```

Sample m = new Sample(); 
m.Length = 10;

Discuss

Correct Answer:

Sample m = new Sample(); 
m.Length = 10;

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