using System;

using System.Collections;

​

public class Temperature : IComparable

{  

    // The temperature value

    protected double temperatureF;

​

                // QUESTION: What is this method doing?

        /* The CompareTo method is implementing the IComparable interface and is used for comparing two Temperature objects. 

        It first checks if the input object is null and returns 1 if it is. Then it casts the input object to a Temperature object,

        and if it is not null, it compares the temperature value of the current Temperature object with the temperature value of the input 

        Temperature object. It returns the result of the comparison as an integer value (-1 if the current temperature is less than the 

        input temperature, 0 if they are equal, and 1 if the current temperature is greater than the input temperature). If the input object

        is not a Temperature object, it throws an ArgumentException with the message "Object is not a Temperature".*/ 

    public int CompareTo(object obj) {

        if (obj == null) return 1;

​

        Temperature otherTemperature = obj as Temperature;

        if (otherTemperature != null)

            return this.temperatureF.CompareTo(otherTemperature.temperatureF);

        else

           throw new ArgumentException("Object is not a Temperature");

                // ADD an example in the main method that demonstrates calling this exception (i.e., let's break the method!)

    }

​

    public double Fahrenheit

    {

        get

        {

            return this.temperatureF;

        }

        set 

        {

            this.temperatureF = value;

        }

    }

​

                // QUESTION What does this property do?

        /* The Celsius property is a getter/setter property that converts the temperature value of the Temperature object from Fahrenheit

        to Celsius when getting the value and from Celsius to Fahrenheit when setting the value. It uses a formula to convert temperature 

        values between Fahrenheit and Celsius */        

    public double Celsius

    {

        get

        {

            return (this.temperatureF - 32) * (5.0/9);

        }

        set

        {

            this.temperatureF = (value * 9.0/5) + 32;

        }

    }

}

​

public class CompareTemperatures

{

   public static void Main()

   {

      Temperature t1 = new Temperature();

       t1.Fahrenheit = 75;

      Temperature t2 = new Temperature();

       t2.Fahrenheit = 80;

      Console.Write(t1.CompareTo(t2));

      Console.WriteLine("\n-------------");

      ArrayList temperatures = new ArrayList();

      // Initialize random number generator.

      Random rnd = new Random();

​

      // Generate 10 temperatures between 0 and 100 randomly.

      for (int ctr = 1; ctr <= 10; ctr++)

      {

         int degrees = rnd.Next(0, 100);

         Temperature temp = new Temperature();

         temp.Fahrenheit = degrees;

         temperatures.Add(temp);

      }

​

                    // ADD Print the array using a for each before sorting.

        Console.WriteLine("Before sorting:");

      foreach (Temperature temp in temperatures)

         Console.WriteLine(temp.Fahrenheit);

        Console.WriteLine("-------------");

                    // QUESTION How is this different from the for each at the end of this app?

       /* The for each loop before sorting is used to print the Fahrenheit temperature value of each Temperature object 

       in the ArrayList before the ArrayList is sorted. The for each loop at the end of the app is used to print the 

       Fahrenheit temperature value of each Temperature object in the ArrayList after the ArrayList is sorted. 

       The purpose of the first loop is to show the unsorted values, and the purpose of the second loop is to show the sorted values. */

        // Example that demonstrates calling the exception in CompareTo method.

      string str = "invalid object";

      try {

          t1.CompareTo(str); // This line will throw an ArgumentException because the input object is not a Temperature object.

      }

      catch (ArgumentException ex) {

          Console.WriteLine(ex.Message); // Output: Object is not a Temperature

      }

         Console.WriteLine("-------------");

      // Sort ArrayList.

      temperatures.Sort();

​

      foreach (Temperature temp in temperatures)

         Console.WriteLine(temp.Fahrenheit);

   }

}

// The example displays the following output to the console (individual

// values may vary because they are randomly generated):

//       2

//       7

//       16

//       17

//       31

//       37

//       58

//       66

//       72

//       95