namespaces csharp-programming question and answers -Page first

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Namespaces problems

1. Which of the following statements is correct about namespaces in C#.NET?
Options
A. Namespaces can be nested only up to level 5.
B. A namespace cannot be nested.
C. There is no limit on the number of levels while nesting namespaces.
D. If namespaces are nested, then it is necessary to use using statement while using the elements of the inner namespace.
E. Nesting of namespaces is permitted, provided all the inner namespaces are declared in the same file.

2. Which of the following is absolutely neccessary to use a class Point present in namespace Graph stored in library?
Options
A. Use fully qualified name of the Point class.
B. Use using statement before using the Point class.
C. Add Reference of the library before using the Point class.
D. Use using statement before using the Point class.
E. Copy the library into the current project directory before using the Point class.

3. Which of the following statments are the correct way to call the method Issue() defined in the code snippet given below?

namespace College
{
    namespace Lib
    {
        class Book
        {
            public void Issue()
            {
                // Implementation code
            }
        }
        class Journal
        {
            public void Issue()
            {
                // Implementation code
            }
        }
    }
}

College.Lib.Book b = new College.Lib.Book(); 
b.Issue();

```
Book b = new Book(); 
b.Issue();
```

using College.Lib; 
Book b = new Book(); 
b.Issue();

using College;
Lib.Book b = new Lib.Book(); 
b.Issue();

using College.Lib.Book; 
Book b = new Book(); 
b.Issue();

Options
A. 1, 3
B. 2, 4
C. 3
D. 4, 5

Discuss

4. If a class called Point is present in namespace n1 as well as in namespace n2, then which of the following is the correct way to use the Point class?
Options

namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            import n1; 
            Point x = new Point();
            x.fun();
            import n2;
            Point y = new Point(); 
            y.fun();
        }
    }
}

import n1; 
import n2;
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        {
            n1.Point x = new n1.Point(); 
            x.fun();
            n2.Point y = new n2.Point(); 
            y.fun();
        }
    }
}

namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    {
        static void Main(string[] args)
        {
            using n1;
            Point x = new Point();
            x.fun();
            using n2;
            Point y = new Point();
            y.fun();
        }
    }
}

using n1;
using n2; 
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            n1.Point x = new n1.Point(); 
            x.fun();
            n2.Point y = new n2.Point(); 
            y.fun(); 
        } 
    } 
}

Discuss

Correct Answer:

using n1;
using n2; 
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            n1.Point x = new n1.Point(); 
            x.fun();
            n2.Point y = new n2.Point(); 
            y.fun(); 
        } 
    } 
}

5. Which of the following statements is correct about the using statement used in C#.NET?
Options
A. using statement can be placed anywhere in the C#.NET source code file.
B. It is permitted to define a member at namespace level as a using alias.
C. A C#.NET source code file can contain any number of using statement.
D. By using using statement it is possible to create an alias for the namespace but not for the namespace element.
E. By using using statement it is possible to create an alias for the namespace element but not for the namespace.

Discuss

7. Which of the following statements is correct about a namespace in C#.NET?
Options
A. Namespaces help us to control the visibility of the elements present in it.
B. A namespace can contain a class but not another namespace.
C. If not mentioned, then the name 'root' gets assigned to the namespace.
D. It is necessary to use the using statement to be able to use an element of a namespace.
E. We need to organise the classes declared in Framework Class Library into different namespaces.

Discuss

9. Which of the following is correct way to rewrite the C#.NET code snippet given below?

using Microsoft.VisualBasic;
using System.Windows.Forms;
MessageBox.Show("Wait for a" + ControlChars.CrLf + "miracle");

Options

using System.Windows.Forms;
using CtrlChars = Microsoft.VisualBasic.ControlChars; 
MessageBox.Show("Wait for a" + CrLf + "miracle");

using Microsoft.VisualBasic; 
using System.Windows.Forms; 
CtrlChars = ControlChars;
MessageBox.Show("Wait for a" + CtrlChars.CrLf + "miracle");

using Microsoft.VisualBasic; 
using System.Windows.Forms; 
CtrlChars = ControlChars; 
MessageBox.Show ("Wait for a" + CrLf + "miracle");

using System.Windows.Forms;
using CtrlChars = Microsoft.VisualBasic.ControlChars; 
MessageBox.Show("Wait for a" + CtrlChars.CrLf + "miracle");

Discuss

Correct Answer:

using System.Windows.Forms;
using CtrlChars = Microsoft.VisualBasic.ControlChars; 
MessageBox.Show("Wait for a" + CtrlChars.CrLf + "miracle");

10. Which of the following C#.NET code snippets will correctly print "Hello C#.NET"?
Options

import System; 
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            Console.WriteLine("Hello C#.NET");
        } 
    } 
}

using System;
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[ ] args)
        { 
            WriteLine("Hello C#.NET");
        } 
    } 
}

using System.Console; 
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main (string[ ] args)
        { 
            WriteLine("Hello C#.NET");
        } 
    } 
}

using System;
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            Console.WriteLine("Hello C#.NET");
        }
    }
}

Discuss

Correct Answer:

using System;
namespace CuriousTabConsoleApplication
{ 
    class MyProgram
    { 
        static void Main(string[] args)
        { 
            Console.WriteLine("Hello C#.NET");
        }
    }
}

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