Finishing adding solution to Quiz #8

Author: Clément

source/code/projects/FileLineCount/FileLineCount/Program.cs

@@ -0,0 +1,58 @@
+using System;
+using System.IO;
+
+class Program
+{
+  static void Main(string[] args)
+  {
+    // Creating a dummy file with a random number of lines.
+    string directoryPath = AppDomain
+      .CurrentDomain
+      .BaseDirectory;
+    string filePath = Path.Combine(directoryPath, "dummy.txt");
+    // Creating a generator for random numbers.
+    Random gen = new Random();
+    int linePopulated = gen.Next(20, 100);
+    // We will store between 20 and 99 numbers in our file.
+    // We first populate the file with random characters.
+    try
+    {
+      StreamWriter sw = new StreamWriter(filePath);
+      for (int i = 0; i < linePopulated; i++)
+        sw.WriteLine((char)gen.Next(32, 126));
+      sw.Close();
+    }
+    catch (Exception ex)
+    {
+      Console.WriteLine(ex);
+    }
+
+    // The following count the number of lines
+    // in the file we created.
+    int count = 0;
+    string line;
+    try
+    {
+      StreamReader sr = new StreamReader(filePath);
+      line = sr.ReadLine();
+      while (line != null)
+      {
+       count++;
+        line = sr.ReadLine();
+      }
+      sr.Close();
+    }
+    catch (Exception ex)
+    {
+      Console.WriteLine(ex);
+    }
+    // We can do a simple check to make sure
+    // we populated as many lines as we counted.
+    if(count != linePopulated){
+      throw new Exception("Something was wrong!");
+    }
+    else{
+      Console.WriteLine($"The file located at {filePath} has {count} lines.");
+    }
+  }
+}

source/solutions/io/files.md

@@ -57,7 +57,7 @@ tags:
 
     #. It does not close the file properly,
     #. It can throw exceptions if e.g., `filePath` cannot be accessed by the program,
-    #. It possibly overwrite the file located at `filePath`.
+    #. It possibly overwrites the file located at `filePath`.
 
     To solve those, it should be edited to:
 
@@ -66,6 +66,15 @@ tags:
     #. Either test first if the file exists, or use the `StreamWriter` constructor that appends to the file if it already exists.
     </details>
 
+#. Assume that `filePath` contains the path to a text file that is not empty. Write a program that counts its number of lines.
+
+    <details><summary>Solution</summary>
+    ```{download="./code/projects/FileLineCount.zip"}
+    !include`snippetStart="// in the file we created.",snippetEnd="// We can do a simple check to make sure"` code/projects/FileLineCount/FileLineCount/Program.cs
+    ```
+    </details>
+
+
 #. Write a program that create a text file called `HelloWorld.txt` in its `bin/Debug` folder and store "Hello" followed by a name entered by the user in it.
 
     <details><summary>Solution</summary>