If a Student class has an indexed property which is used to store or retrieve va

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Question
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

Correct Answer

2, 3

Properties problems

Search Results

1. 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;
        }
    } 
}

2. 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;
        } 
    } 
}

3. 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

4. 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

Discuss

5. 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

6. 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;

7. If a class Student has an indexer, then which of the following is the correct way to declare this indexer to make the C#.NET code snippet given below work successfully?
```
Student s = new Student(); 
s[1, 2] = 35;
```
Options

class Student
{ 
    int[ ] a = new int[5, 5]; 
    public property WriteOnly int this[int i, int j]
    { 
        set
        { 
            a[i, j] = value;
        } 
    }
}

class Student
{ 
    int[ , ] a = new int[5, 5]; 
    public int property WriteOnly
    { 
        set
        { 
            a[i, j] = value;
        } 
    } 
}

class Student
{ 
    int[ , ] a = new int[5, 5];
    public int this[int i, int j] 
    {
        set
        { 
            a[i, j] = value;
        } 
    } 
}

class Student
{ 
    int[ , ] a = new int[5, 5];
    int i, j; 
    public int this
    { 
        set
        { 
            a[i, j] = value;
        } 
    } 
}

Discuss

Correct Answer:

class Student
{ 
    int[ , ] a = new int[5, 5];
    public int this[int i, int j] 
    {
        set
        { 
            a[i, j] = value;
        } 
    } 
}

8. An Account class has a property called accountNo and acc is a reference to a bank object and we want the C#.NET code snippet given below to work. Which of the following options will ensure this functionality?
```
acc.accountNo = 10; 
Console.WriteLine(acc.accountNo);
```
Options
A. Declare accountNo property with both get and set accessors.
B. Declare accountNo property with only get accessor.
C. Declare accountNo property with get, set and normal accessors.
D. Declare accountNo property with only set accessor.
E. None of the above

Discuss

10. A Student class has a property called rollNo and stu is a reference to a Student object and we want the statement stu.RollNo = 28 to fail. Which of the following options will ensure this functionality?
Options
A. Declare rollNo property with both get and set accessors.
B. Declare rollNo property with only set accessor.
C. Declare rollNo property with get, set and normal accessors.
D. Declare rollNo property with only get accessor.
E. None of the above

Discuss

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