interfaces csharp-programming question and answers -Page 2

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Interfaces problems

1. Which of the following is the correct implementation of the interface given below?
```
interface IMyInterface
{ 
    double MyFun(Single i);
}
```
Options

class MyClass
{
    double MyFun(Single i) as IMyInterface.MyFun
    {
        // Some code
    }
}

class MyClass 
{
    MyFun (Single i) As Double
    {
        // Some code
    } 
}

class MyClass: implements IMyInterface
{
    double fun(Single si) implements IMyInterface.MyFun()
    {
        //Some code
    } 
}

class MyClass: IMyInterface
{
    double IMyInterface.MyFun(Single i)
    {
        // Some code
    } 
}

Discuss

Correct Answer:

class MyClass: IMyInterface
{
    double IMyInterface.MyFun(Single i)
    {
        // Some code
    } 
}

2. Which of the following statements is correct about an interface used in C#.NET?
Options
A. If a class implements an interface partially, then it should be an abstract class.
B. A class cannot implement an interface partially.
C. An interface can contain static methods.
D. An interface can contain static data.
E. Multiple interface inheritance is not allowed.

Discuss

3. Which of the following is the correct way to implement the interface given below?
```
interface IPerson
{ 
    String FirstName
    {
        get;
        set; 
    } 
}
```
Options

class Employee : IPerson
{
    private String str; 
    public String FirstName
    {
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}

class Employee
{
    private String str;
    public String IPerson.FirstName
    { 
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}

class Employee : implements IPerson
{
    private String str; 
    public String FirstName
    { 
        get
        { 
            return str;
        } 
        set
        {
            str = value; 
        } 
    } 
}

D. None of the above

Discuss

Correct Answer:

class Employee : IPerson
{
    private String str; 
    public String FirstName
    {
        get
        { 
            return str;
        } 
        set
        { 
            str = value;
        } 
    } 
}

4. Which of the following statements is correct about an interface used in C#.NET?
Options
A. One class can implement only one interface.
B. In a program if one class implements an interface then no other class in the same program can implement this interface.
C. From two base interfaces a new interface cannot be inherited.
D. Properties can be declared inside an interface.
E. Interfaces cannot be inherited.

Discuss

5. Which of the following statements are correct about an interface in C#.NET?
1. A class can implement multiple interfaces.
2. Structures cannot inherit a class but can implement an interface.
3. In C#.NET, : is used to signify that a class member implements a specific interface.
4. An interface can implement multiple classes.
5. The static attribute can be used with a method that implements an interface declaration.
Options
A. 1, 2, 3
B. 2, 4
C. 3, 5
D. None of the above.

Discuss

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Interfaces problems

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