Question 1

Instead of hard coding the actual filename and file path,you could prompt the user for the name of the file using subclasses of the FileDialog class.

Accepted Answer

It is recommended to use subclasses of the FileDialog class to prompt the user for the name and file path instead of hard coding it in the program.

Question 2

The File,FileInfo,Directory,and DirectoryInfo classes are considered utility classes.They normally work with stream objects,allowing you to manipulate files and directory structures.

Accepted Answer

The File, FileInfo, Directory, and DirectoryInfo classes are all utility classes that allow manipulation of files and directory structures using stream objects.

Question 3

The ____ class has implementations for Write( )and WriteLine( )methods similar to the Console class methods.

Accepted Answer

The answer of The ____ class has implementations for Write(...

Question 4

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
-The identifier that can be referenced in a WriteLine( )method with the declaration above is ____.

Accepted Answer

The identifier "outputFile" is a StreamWriter object, which can be used with the WriteLine() method to write to the file.

Question 5

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
-If an invalid path is included with the constructor for a StreamWriter object,____.

Accepted Answer

If an invalid path is included with the constructor for a StreamWriter object, an IOException exception is thrown. This is because an invalid path means that the file cannot be accessed or created, which is an input/output related error. An InValidPathException does not exist in C#, and a System exception is too broad and not specific to the error at hand. The program does not necessarily terminate in this scenario, as the exception can be caught and handled appropriately.

Question 6

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
-What does the above statement do?

Accepted Answer

The statement uses a while loop to read every line from an input file as long as the value is not null. Therefore, option D is the correct choice.

Question 7

No exception is thrown if you attempt to close or open a file that does not exist.

Accepted Answer

Attempting to open a file that does not exist typically results in an exception, such as a `FileNotFoundException` in many programming languages. Similarly, attempting to close a file that was never opened or does not exist might also lead to an exception, depending on the context and language.

Question 8

The abstract classes of Stream,TextWriter,and TextReader are defined for dealing with files in the ____ namespace.

Accepted Answer

The Stream, TextWriter, and TextReader abstract classes are defined in the System.IO namespace, which provides types for performing input and output operations on files and streams. This namespace contains classes such as FileStream, StreamReader, and StreamWriter, which enable you to read from and write to files with various formats and encodings. Therefore, the correct choice is A) System.IO.

Question 9

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
-Using the above segment of code,inValue would be defined as what type of data?

Accepted Answer

The inValue variable is being assigned the value of each line read in from the file, which would be a string data type. Therefore, the correct choice is D.

Question 10

None of the of the method named in the File and Directory classes are available as instance methods (with the same name)in the FileInfo and DirectoryInfo classes since they are available in File and Directory.

Accepted Answer

The methods in the File and Directory classes are available as instance methods (with the same name) in the FileInfo and DirectoryInfo classes.

Question 11

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
-If you browse using Windows Explorer or Computer,the physical file that already exists before the two statements from above are executed is ____.

Accepted Answer

The physical file that already exists before the two statements are executed is "someInputFileName", as it is the input file that is being read from, not the output file that is being written to.

Question 12

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
-Every member of the File class is static-meaning methods are called ____.

Accepted Answer

Since every member of the File class is static, its methods are called with the class name.

Question 13

To invoke File's Copy( )method to make a copy of "source.txt",naming the new file "target.txt",you would write: File.Copy("source.txt","target.txt");because Copy is a static member of the File class.

Accepted Answer

This statement is correct because the Copy method is a static member of the File class, and can be accessed by invoking it on the class. The syntax for copying a file using this method is File.Copy("source.txt","target.txt").

Question 14

Binary files can not be read using notepad.

Accepted Answer

Notepad can only read plain text files, while binary files are made up of machine-readable code that can't be interpreted as text.

Question 15

When you place an @ in front of a string,the string becomes a(n)____.

Accepted Answer

When an @ is placed in front of a string, it becomes a verbatim string - this means that escape sequences (such as 
 or 	) are ignored and the string is outputted exactly as it looks. It is not a comment, numeric value, or argument.

Question 16

When you close a file,no arguments are sent to the method;however,the Close( )method must be called with a file object such as fileObjectInFile.Close( ).

Accepted Answer

The Close() method must be called with a file object. No arguments are sent to the method when closing a file.

Question 17

The StreamReader class is used to create text files.

Accepted Answer

The StreamReader class is used to read text from an existing file, it is not used to create text files. The StreamWriter class is used to create text files.

Question 18

Which of the following class belongs to the System.IO namespace?

Accepted Answer

The answer of Which of the following class belongs to...

Question 19

After an application is debugged and you are ready to deploy or distribute it,you can build the most optimized solution,a Release version.To switch to the Release version,select Release from the Solution Configurations list box on the Standard Visual Studio toolbar.

Accepted Answer

Switching to the Release version is done by selecting Release from the Solution Configurations list box.

Question 20

The StreamReader class is most often used to retrieve single characters,one character at a time,from a file.

Accepted Answer

The StreamReader class is used to read a file line by line or a block of characters at a time, not just single characters.

Quiz 13: Working with Files

Instead of hard coding the actual filename and file path,you could prompt the user for the name of the file using subclasses of the FileDialog class.

The File,FileInfo,Directory,and DirectoryInfo classes are considered utility classes.They normally work with stream objects,allowing you to manipulate files and directory structures.

The ____ class has implementations for Write( ) and WriteLine( ) methods similar to the Console class methods.

StreamWriter outputFile = new StreamWriter("someOutputFileName") ; StreamReader inputFile = new StreamReader("someInputFileName") ; -The identifier that can be referenced in a WriteLine( ) method with the declaration above is ____.

StreamWriter outputFile = new StreamWriter("someOutputFileName") ; StreamReader inputFile = new StreamReader("someInputFileName") ; -If an invalid path is included with the constructor for a StreamWriter object,____.

StreamReader inFile = new StreamReader("name.txt") ; while ((inValue = inFile.ReadLine() ) != null) -What does the above statement do?