properties csharp-programming question and answers -Page first

CuriousTab

Properties problems

1. 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;
        } 
    } 
}

2. 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;
        }
    } 
}

3. 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

4. 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;

5. 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;
        } 
    } 
}

6. 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

8. 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

9. Which of the following statements are correct?
1. The signature of an indexer consists of the number and types of its formal parameters.
2. Indexers are similar to properties except that their accessors take parameters.
3. Accessors of interface indexers use modifiers.
4. The type of an indexer and the type of its parameters must be at least as accessible as the indexer itself.
5. An interface accessor contains a body.
Options
A. 1, 3, 5
B. 1, 2, 4
C. 3, 5
D. 2, 4

Discuss

10. Which of the following statements is correct about properties used in C#.NET?
Options
A. A property can simultaneously be read only or write only.
B. A property can be either read only or write only.
C. A write only property will have only get accessor.
D. A write only property will always return a value.

Discuss

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