Skip to content

Questions

  1. What is a file?
  2. What is a text file?
  3. How is the end of a line in a text file indicated?
  4. Find three other control codes that can be embedded in a text file. How are these used in C#?

  5. The File class in the namespace System.IO has a number of static methods. Find the method that provides the following functionality:

    a. Copies one file to another b. Moves a file to another location c. Reads all lines in the file to a string d. Checks if a file exists in a given location e. Appends a string to a file f. Opens a FileStream with read/write access

  6. Describe a struct to hold details of a Book, including the fields Title, Author, ISBN, PublicationYear and Price.

  7. What exceptions might occur when opening a file programmatically?

  8. Given the following recursive method, an input string of "Peter,Jones,Marketing Manager,Ext. 788" and the , as the delimiter, what will be the output on the screen:

     1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
    static void OutputCSVLines(string input, char delimiter)
{
    int location = input.IndexOf(delimiter)+1;
    string word = input.Substring(0, location);
    string rest = input.Substring(location);
    if (location > 0)
    {
        Console.WriteLine(word.Trim());
        OutputCSVLines(rest,',');
    }
    else
    {
        Console.WriteLine(rest);
    }
}

Additional Exercises

  1. Write a program that reads the contents of a text file and inserts the line numbers at the beginning of each line, then rewrites the file contents.
  2. Modify the Caesar Cipher program to read the plaintext from a file, output the cipher text to a different file.
  3. Modify the Maze program to read a maze pattern from a file
  4. Write a program to read a list of names from a file, sorts them (using a bubble sort or alternative sorting algorithm) and writes the sorted list back to the file
  5. Write a program to read a file of text and count the number of words in the file